321 lines
17 KiB
JSON
321 lines
17 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-21640",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-12-29T08:45:45.727Z",
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"datePublished": "2025-01-19T10:17:57.593Z",
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"dateUpdated": "2026-10-15T21:51:51.964Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T11:53:19.350Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy\n\nAs mentioned in a previous commit of this series, using the 'net'\nstructure via 'current' is not recommended for different reasons:\n\n- Inconsistency: getting info from the reader's/writer's netns vs only\n from the opener's netns.\n\n- current->nsproxy can be NULL in some cases, resulting in an 'Oops'\n (null-ptr-deref), e.g. when the current task is exiting, as spotted by\n syzbot [1] using acct(2).\n\nThe 'net' structure can be obtained from the table->data using\ncontainer_of().\n\nNote that table->data could also be used directly, as this is the only\nmember needed from the 'net' structure, but that would increase the size\nof this fix, to use '*data' everywhere 'net->sctp.sctp_hmac_alg' is\nused."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
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"baseScore": 7.1,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The buggy handler is only reachable through local interfaces — a write/read on /proc/sys/net/sctp/cookie_hmac_alg or an acct(2)-pinned file — never from received network data. No remote peer input reaches proc_sctp_do_hmac_alg().\nAC:L - Both paths are deterministic and fully attacker-controlled: the netns-confusion write is a plain unshare + SCM_RIGHTS + write(2) sequence with no race, and the acct(2) NULL deref triggers reliably every time the pidns reaper exits. No memory-layout or timing conditions outside the attacker's control.\nPR:L - The cross-namespace path needs only an unprivileged local user, since unprivileged user namespaces (default-enabled on Ubuntu/Debian/Fedora/Android) make the caller owner of the new userns and thus CAP_NET_ADMIN-equivalent over its netns, letting it drive a write that lands in init_net. Only the secondary acct(2) oops path additionally needs CAP_SYS_PACCT.\nUI:N - The attacker performs every step itself — unshare, open, fd passing, write, or acct(2) plus process exit. No victim action or cooperation is involved.\nS:U - The vulnerable component and the impacted resource are both the kernel under the same security authority; per kernel CNA convention namespace/privilege boundary crossings within the kernel are scored Unchanged rather than as a Changed-scope escape.\nC:N - The read path always returns the reader's own netns value, so no data crosses a security boundary, and the NULL dereference discloses no memory contents. There is no read primitive or information leak.\nI:H - An unprivileged user can make the handler write the initial network namespace's sctp_hmac_alg; setting it to \"none\" leaves sp->hmac NULL so sctp_unpack_cookie() jumps to no_hmac and skips signature verification entirely, disabling SCTP state-cookie authentication host-wide and enabling blind association spoofing. That is a serious loss of integrity for a security-relevant global setting.\nA:H - With current->nsproxy NULL during task exit the handler dereferences a NULL pointer, producing a kernel Oops (syzbot-confirmed) — a full panic on panic_on_oops systems and at minimum a task killed in the middle of do_exit with namespaces already torn down."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sctp/sysctl.c"
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],
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"versions": [
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "5599b212d2f4466e1832a94e9932684aaa364587",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "03ca51faba2b017bf6c90e139434c4117d0afcdc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "86ddf8118123cb58a0fb8724cad6979c4069065b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "3cd0659deb9c03535fd61839e91d4d4d3e51ac71",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "ad673e514b2793b8d5902f6ba6ab7e890dea23d5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "f0bb3935470684306e4e04793a20ac4c4b08de0b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "3c68198e75111a905ac2412be12bf7b29099729b",
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"lessThan": "ea62dd1383913b5999f3d16ae99d411f41b528d4",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/sctp/sysctl.c"
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],
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"versions": [
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{
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"version": "3.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.292",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.234",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.177",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.125",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.72",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.10",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.13",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "5.4.292"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "5.10.234"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "5.15.177"
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{
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"vulnerable": true,
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"versionStartIncluding": "3.8",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/5599b212d2f4466e1832a94e9932684aaa364587"
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},
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{
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"url": "https://git.kernel.org/stable/c/03ca51faba2b017bf6c90e139434c4117d0afcdc"
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},
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{
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"url": "https://git.kernel.org/stable/c/86ddf8118123cb58a0fb8724cad6979c4069065b"
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},
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{
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"url": "https://git.kernel.org/stable/c/3cd0659deb9c03535fd61839e91d4d4d3e51ac71"
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},
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{
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"url": "https://git.kernel.org/stable/c/ad673e514b2793b8d5902f6ba6ab7e890dea23d5"
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},
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{
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"url": "https://git.kernel.org/stable/c/f0bb3935470684306e4e04793a20ac4c4b08de0b"
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},
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{
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"url": "https://git.kernel.org/stable/c/ea62dd1383913b5999f3d16ae99d411f41b528d4"
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}
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],
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"title": "sctp: sysctl: cookie_hmac_alg: avoid using current->nsproxy",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
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},
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T20:58:23.595Z"
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}
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},
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{
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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:02:43.506Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "*",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
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}
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]
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2025-21640",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:42:36.380698Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-15T21:51:51.964Z"
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}
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}
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]
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}
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} |