{ "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" }, { "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1", "lessThan": "956541efd125a10442f9514668bc5c852702c93b", "status": "affected", "versionType": "git" }, { "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1", "lessThan": "ec1627bcb5b51ddd46b1ef27a9d5a9834abb0a6a", "status": "affected", "versionType": "git" }, { "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1", "lessThan": "7e48afafe7abc275f7b6916613bb18b821e7d94a", "status": "affected", "versionType": "git" }, { "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1", "lessThan": "0d9636ecba34bd553ecf19049f7705505aea62fd", "status": "affected", "versionType": "git" }, { "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1", "lessThan": "4c02acbe0a2692ca9991c51e62bbe6d6b59dac31", "status": "affected", "versionType": "git" }, { "version": "f66e883eb6186bc43a79581b67aff7d1a69d0ff1", "lessThan": "779972513c2fa8c7938e54976f686091dafff22f", "status": "affected", "versionType": "git" } ] }, { "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" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.26", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }