300 lines
15 KiB
JSON
300 lines
15 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-2025-38561",
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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": "2025-04-16T04:51:24.025Z",
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"datePublished": "2025-08-19T17:02:38.719Z",
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"dateUpdated": "2026-08-05T12:02:55.275Z"
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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": "2026-08-05T12:02:55.275Z"
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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\nksmbd: fix Preauh_HashValue race condition\n\nIf client send multiple session setup requests to ksmbd,\nPreauh_HashValue race condition could happen.\nThere is no need to free sess->Preauh_HashValue at session setup phase.\nIt can be freed together with session at connection termination phase."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - ksmbd is the in-kernel SMB server listening on TCP/445, and the entire path is driven by remote SMB2 SESSION_SETUP PDUs parsed straight off the socket. Internet- and LAN-facing NAS, container, and file-server deployments are directly exposed.\nAC:L - The attacker controls both sides of the race completely — how many SESSION_SETUP PDUs to pipeline, across how many TCP connections, whether to use multichannel binding to bypass the per-connection mutex entirely, and when to drop the socket to race connection teardown. ksmbd's non-ordered workqueue guarantees parallel processing, and failed attempts cost only a reconnect.\nPR:N - SESSION_SETUP is the authentication handshake itself; the buffer is allocated, hashed, and read on the response path before any credential is verified, and the NtLmNegotiate racer is fully pre-authentication. The guest branch of ntlm_authenticate() skips the NTLM blob check entirely, reaching the vulnerable kfree() with no credentials on the common guest-mapped share configuration.\nUI:N - Exploitation requires only that the attacker connect to the SMB port and send session setup requests. No action by any local user or administrator is needed.\nS:U - The double free and use-after-free corrupt kernel heap memory within the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed 64-byte chunk is read back via sha512_update() and, decisively, serves as the KDF context for the SMB 3.1.1 signing and encryption keys — reclaiming it with chosen content yields attacker-known session keys and decryption of other clients' traffic. The double free of a general-purpose kmalloc-64 object is also a standard route to a full arbitrary-read primitive.\nI:H - This is a double free of a kmalloc-64 object plus a 64-byte out-of-lifetime write (sha512_final into the freed buffer) that clobbers whatever victim object reclaimed the slot, giving the classic heap-grooming path to arbitrary write and control-flow hijack. It additionally enables forging signed SMB messages by controlling the signing-key derivation context.\nA:H - The double free corrupts the SLUB freelist and the use-after-free write smashes reclaimed objects, both of which panic the kernel. The racing NULL store also reaches ksmbd_gen_smb311_encryptionkey()/ksmbd_gen_smb311_signingkey(), which dereference sess->Preauth_HashValue with no NULL check, for a trivially repeatable remote oops."
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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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"fs/smb/server/smb2pdu.c"
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],
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"versions": [
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{
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"version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "fbf5c0845ed15122a770bca9be1d9b60b470d3aa",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "b69fd87076daa66f3d186bd421a7b0ee0cb45829",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "edeecc7871e8fc0878d53ce286c75040a0e38f6c",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "6613887da1d18dd2ecfd6c6148a873c4d903ebdc",
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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": "0626e6641f6b467447c81dd7678a69c66f7746cf",
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"lessThan": "44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6",
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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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"fs/smb/server/smb2pdu.c"
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],
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"versions": [
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{
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"version": "5.15",
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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": "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": "6.1.148",
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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": "6.6.102",
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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": "6.12.42",
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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": "6.15.10",
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"lessThanOrEqual": "6.15.*",
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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": "6.16.1",
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"lessThanOrEqual": "6.16.*",
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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": "6.17",
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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": "5.15",
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"versionEndExcluding": "6.1.148"
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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": "5.15",
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"versionEndExcluding": "6.6.102"
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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": "5.15",
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"versionEndExcluding": "6.12.42"
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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": "5.15",
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"versionEndExcluding": "6.15.10"
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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": "5.15",
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"versionEndExcluding": "6.16.1"
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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": "5.15",
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"versionEndExcluding": "6.17"
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}
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]
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}
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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/fbf5c0845ed15122a770bca9be1d9b60b470d3aa"
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},
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{
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"url": "https://git.kernel.org/stable/c/b69fd87076daa66f3d186bd421a7b0ee0cb45829"
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},
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{
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"url": "https://git.kernel.org/stable/c/edeecc7871e8fc0878d53ce286c75040a0e38f6c"
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},
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{
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"url": "https://git.kernel.org/stable/c/7d7c0c5304c88bcbd7a85e9bcd61d27e998ba5fc"
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},
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{
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"url": "https://git.kernel.org/stable/c/6613887da1d18dd2ecfd6c6148a873c4d903ebdc"
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},
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{
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"url": "https://git.kernel.org/stable/c/44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6"
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},
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{
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"url": "https://www.zerodayinitiative.com/advisories/ZDI-25-916/"
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}
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],
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"title": "ksmbd: fix Preauh_HashValue race condition",
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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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"cvssV3_1": {
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"scope": "CHANGED",
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"version": "3.1",
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"baseScore": 8.5,
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"attackVector": "NETWORK",
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"baseSeverity": "HIGH",
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"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "HIGH",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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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-2025-38561",
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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": "2025-09-26T03:55:12.286714Z"
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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-362",
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"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
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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": "2026-02-26T17:48:28.579Z"
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}
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},
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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/2025/10/msg00008.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": "2025-11-03T17:39:50.588Z"
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}
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}
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]
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}
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} |