310 lines
16 KiB
JSON
310 lines
16 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-2026-64009",
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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": "2026-07-19T07:54:57.026Z",
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"datePublished": "2026-07-19T14:56:24.448Z",
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"dateUpdated": "2026-10-19T20:28:08.230Z"
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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": "2026-08-05T12:38:09.114Z"
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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\nxfrm: Check for underflow in xfrm_state_mtu\n\nLeo Lin reported OOB write issue in esp component:\n\n xfrm_state_mtu() returns u32 but performs its arithmetic in unsigned\n modulo-2^32 space using an attacker-influenced \"header_len + authsize +\n net_adj\" subtracted from a small \"mtu\" argument. A nobody user can\n install an IPv4 ESP tunnel SA with a large authentication key\n (XFRMA_ALG_AUTH_TRUNC, e.g. hmac(sha512), 64-byte key, 64-byte trunc),\n configure a small interface MTU (68 bytes), and set XFRMA_TFCPAD to a\n large value. When a single UDP datagram is then sent through the\n tunnel, xfrm_state_mtu() underflows to a near-2^32 value, and\n esp_output() consumes it as a signed int via:\n\n padto = min(x->tfcpad, xfrm_state_mtu(x, mtu_cached))\n esp.tfclen = padto - skb->len (assigned to int)\n\n esp.tfclen ends up negative (e.g. -207). It is sign-extended to size_t\n when passed to memset() inside esp_output_fill_trailer(), producing a\n ~16 EB write of zeroes at skb_tail_pointer(skb). KASAN logs it as\n \"Write of size 18446744073709551537 at addr ffff888...\".\n\nCheck for underflow and return 1. This causes the sendmsg attempt to\nfail with ENETUNREACH."
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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:H/I:H/A:H",
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"baseScore": 7.8,
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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 vulnerability is triggered on the local ESP output path when a process sends a UDP datagram through an attacker-configured XFRM tunnel via sendmsg(); remote peers cannot install XFRM SAs, set interface MTU, or control XFRMA_TFCPAD on the victim system.\nAC:L - The attacker fully controls all preconditions (ESP tunnel SA with large HMAC-SHA512 auth, MTU 68, XFRMA_TFCPAD, and UDP payload size) and can trigger the underflow deterministically with a single datagram as demonstrated in the fix commit.\nPR:L - XFRM state/policy installation and interface MTU configuration require CAP_NET_ADMIN, which an unprivileged local user can obtain in a user namespace via unshare -Urn; this is the most severe reasonable deployment scenario on multi-tenant hosts.\nUI:N - Exploitation requires only the attacker's own netlink configuration and socket send operations; no action from another user or administrator is needed.\nS:U - The vulnerability corrupts kernel heap memory from a local attacker's security context, constituting standard kernel privilege escalation rather than crossing a VM or hypervisor boundary.\nC:H - The bug produces a massive out-of-bounds write via memset() at the skb tail pointer; such heap corruption is exploitable for arbitrary kernel memory disclosure in addition to the demonstrated KASAN-detected write primitive.\nI:H - A negative tfclen sign-extended to size_t causes an enormous memset() OOB write at skb_tail_pointer(skb), providing a memory corruption primitive that can be leveraged for arbitrary kernel writes and code execution.\nA:H - The OOB write reliably triggers kernel oops/panic (KASAN reports a write of size 18446744073709551537 bytes), causing immediate system crash and denial of service."
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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/xfrm/xfrm_state.c"
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],
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"versions": [
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{
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"version": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "8014f70c4e6e5ab101ae3860a614e65e988372e3",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "1021d2877b689a648b27815c854557a917122e93",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "2a41b1b31c61c52b972278ce1732a1443f5e89ed",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "fccd685b32df5aaf6bad4381eeda216468e283f0",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "820e501be8aee4b365d218d83227b314309c5fda",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "82ac903e0b519849647657b8c48d21237ada06a2",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "3db50ceeacb52806d8fe86fb1dfe944df0b9f789",
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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": "c5c2523893747f88a83376abad310c8ad13f7197",
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"lessThan": "742b04d0550b0ec89dcbc99537ec88653bd1ad90",
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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/xfrm/xfrm_state.c"
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],
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"versions": [
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{
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"version": "2.6.22",
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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": "2.6.22",
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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": "5.10.259",
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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": "5.15.210",
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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": "6.1.176",
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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": "6.6.143",
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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": "6.12.93",
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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": "6.18.35",
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"lessThanOrEqual": "6.18.*",
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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": "7.0.12",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "2.6.22",
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"versionEndExcluding": "5.10.259"
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/8014f70c4e6e5ab101ae3860a614e65e988372e3"
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},
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{
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"url": "https://git.kernel.org/stable/c/1021d2877b689a648b27815c854557a917122e93"
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},
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{
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"url": "https://git.kernel.org/stable/c/2a41b1b31c61c52b972278ce1732a1443f5e89ed"
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},
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{
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"url": "https://git.kernel.org/stable/c/fccd685b32df5aaf6bad4381eeda216468e283f0"
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},
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{
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"url": "https://git.kernel.org/stable/c/820e501be8aee4b365d218d83227b314309c5fda"
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},
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{
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"url": "https://git.kernel.org/stable/c/82ac903e0b519849647657b8c48d21237ada06a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/3db50ceeacb52806d8fe86fb1dfe944df0b9f789"
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},
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{
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"url": "https://git.kernel.org/stable/c/742b04d0550b0ec89dcbc99537ec88653bd1ad90"
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}
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],
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"title": "xfrm: Check for underflow in xfrm_state_mtu",
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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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"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-2026-64009",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:35:15.345325Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-191",
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"description": "CWE-191 Integer Underflow (Wrap or Wraparound)"
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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": "2026-10-19T20:28:08.230Z"
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}
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}
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]
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}
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} |