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vuln-cve/data/2026/89xxx/CVE-2026-89609.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-89609",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-09-11T19:38:34.734Z",
"datePublished": "2026-09-11T19:45:11.086Z",
"dateUpdated": "2026-10-19T08:49:41.609Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:49:41.609Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\necryptfs: hold msg ctx list lock when cleaning daemon queue\n\necryptfs_exorcise_daemon() drops queued messages from a dying daemon\nwithout holding ecryptfs_msg_ctx_lists_mux, but\necryptfs_msg_ctx_alloc_to_free() requires that lock.\n\nTake the list lock while moving the queued contexts back to the free\nlist to avoid racing with other global msg ctx list users."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The missing lock is reached only via local syscalls: close() of /dev/ecryptfs runs ecryptfs_miscdev_release() into ecryptfs_exorcise_daemon(), racing PKI open/create that calls ecryptfs_wait_for_response(); no network or adjacent protocol path exists.\nAC:L - The attacker owns both sides of the race: one thread does PKI file ops so wait_for_response() list_move()s a msg_ctx under ecryptfs_msg_ctx_lists_mux, while another closes /dev/ecryptfs so exorcise_daemon() list_move()s the same or sibling nodes without that lock.\nPR:L - ecryptfs_miscdev_open() has no capability check; daemons are per-euid. An unprivileged user reaches this by running ecryptfsd on /dev/ecryptfs and using an eCryptfs mount from setuid mount.ecryptfs_private or an encrypted home, with a user-keyring PRIVATE_KEY auth token.\nUI:N - The attacker registers their own daemon, installs their own auth token, uses their own eCryptfs directory, and issues the create/open/close syscalls; no other user needs to mount, open a file, or otherwise interact.\nS:U - Corrupted global msg_ctx lists and the double-free of msg_ctx->msg stay inside the host kernel's eCryptfs messaging subsystem; this is ordinary kernel impact, not a VM, IOMMU, or sandbox escape.\nC:H - Unlocked list_move() of a queued msg_ctx racing wait_for_response() is a use-after-free of the kmalloc'd message buffer and leaves corrupted global list pointers that can be groomed to disclose kernel memory.\nI:H - The same race is a heap double-free of msg_ctx->msg plus unsynchronized list_move() writes through corrupted next/prev pointers, a classic memory-corruption primitive usable for control-flow hijacking.\nA:H - Concurrent unlocked list_move() readily oopses on LIST_POISON or a general protection fault during later list walks, and the double-free of msg_ctx->msg can panic the kernel."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ecryptfs/messaging.c"
],
"versions": [
{
"version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
"lessThan": "64d8998e36cfd2bb7114f3af0aa51c5a559a39b3",
"status": "affected",
"versionType": "git"
},
{
"version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
"lessThan": "4d50b8aea11ad9594c8704a4c647e11311ab7b19",
"status": "affected",
"versionType": "git"
},
{
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"lessThan": "956541efd125a10442f9514668bc5c852702c93b",
"status": "affected",
"versionType": "git"
},
{
"version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
"lessThan": "ec1627bcb5b51ddd46b1ef27a9d5a9834abb0a6a",
"status": "affected",
"versionType": "git"
},
{
"version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
"lessThan": "7e48afafe7abc275f7b6916613bb18b821e7d94a",
"status": "affected",
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{
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"lessThan": "0d9636ecba34bd553ecf19049f7705505aea62fd",
"status": "affected",
"versionType": "git"
},
{
"version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
"lessThan": "4c02acbe0a2692ca9991c51e62bbe6d6b59dac31",
"status": "affected",
"versionType": "git"
},
{
"version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1",
"lessThan": "779972513c2fa8c7938e54976f686091dafff22f",
"status": "affected",
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]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"fs/ecryptfs/messaging.c"
],
"versions": [
{
"version": "2.6.26",
"status": "affected"
},
{
"version": "0",
"lessThan": "2.6.26",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.270",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "5.10.270"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
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"versionStartIncluding": "2.6.26",
"versionEndExcluding": "7.2.4"
},
{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "2.6.26",
"versionEndExcluding": "7.3"
}
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/64d8998e36cfd2bb7114f3af0aa51c5a559a39b3"
},
{
"url": "https://git.kernel.org/stable/c/4d50b8aea11ad9594c8704a4c647e11311ab7b19"
},
{
"url": "https://git.kernel.org/stable/c/956541efd125a10442f9514668bc5c852702c93b"
},
{
"url": "https://git.kernel.org/stable/c/ec1627bcb5b51ddd46b1ef27a9d5a9834abb0a6a"
},
{
"url": "https://git.kernel.org/stable/c/7e48afafe7abc275f7b6916613bb18b821e7d94a"
},
{
"url": "https://git.kernel.org/stable/c/0d9636ecba34bd553ecf19049f7705505aea62fd"
},
{
"url": "https://git.kernel.org/stable/c/4c02acbe0a2692ca9991c51e62bbe6d6b59dac31"
},
{
"url": "https://git.kernel.org/stable/c/779972513c2fa8c7938e54976f686091dafff22f"
}
],
"title": "ecryptfs: hold msg ctx list lock when cleaning daemon queue",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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