{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-41012", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.611Z", "datePublished": "2024-07-23T08:06:02.579Z", "dateUpdated": "2026-08-05T11:34:38.897Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:34:38.897Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilelock: Remove locks reliably when fcntl/close race is detected\n\nWhen fcntl_setlk() races with close(), it removes the created lock with\ndo_lock_file_wait().\nHowever, LSMs can allow the first do_lock_file_wait() that created the lock\nwhile denying the second do_lock_file_wait() that tries to remove the lock.\nSeparately, posix_lock_file() could also fail to\nremove a lock due to GFP_KERNEL allocation failure (when splitting a range\nin the middle).\n\nAfter the bug has been triggered, use-after-free reads will occur in\nlock_get_status() when userspace reads /proc/locks. This can likely be used\nto read arbitrary kernel memory, but can't corrupt kernel memory.\n\nFix it by calling locks_remove_posix() instead, which is designed to\nreliably get rid of POSIX locks associated with the given file and\nfiles_struct and is also used by filp_flush()." } ], "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 vulnerability is reached only through the local `fcntl(F_SETLK/F_SETLKW)` syscall path in `fcntl_setlk()`, with the resulting use-after-free read triggered by reading the local `/proc/locks` file. Network file-lock consumers (nfsd, lockd, ksmbd) call `vfs_lock_file()` directly and never traverse the buggy recovery branch.\nAC:L - The attacker controls both sides of the fcntl/close race and can make it fully deterministic by blocking a second thread in `F_SETLKW` behind a conflicting lock it owns, closing the fd, then releasing the blocker. The failure of the recovery unlock is likewise attacker-inducible, either via an LSM policy asymmetry or by forcing the `GFP_KERNEL` allocation failure in the mid-range split path under attacker-generated memory pressure.\nPR:L - Any unprivileged local user can call `fcntl()` on a file it can open and read the world-readable `/proc/locks` (confirmed mode `-r--r--r--`); no capability, user-namespace, or mount privilege is checked anywhere along the path.\nUI:N - The attacker performs every step itself — creating the lock, racing the close, and reading `/proc/locks` — with no action required from any other user or process.\nS:U - The dangling `file_lock` and the resulting reads stay within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `lock_get_status()` dereferences the freed `struct file` (`flc->flc_file->f_inode`) and prints `inode->i_sb->s_dev` and `inode->i_ino` to userspace, giving a chosen-address read primitive once the freed slot is groomed — the fix author states this \"can likely be used to read arbitrary kernel memory.\"\nI:H - The use-after-free leaves permanently corrupted kernel lock state — a `file_lock` with dangling `flc_file` and `flc_owner` that can never be released, so a recycled `files_struct` at the same address grants an unrelated (possibly higher-privileged) process spurious ownership of the stale lock. Combined with the arbitrary-read primitive that defeats KASLR and exposes credentials/keys, the condition is leverageable toward privilege escalation.\nA:H - Reading `/proc/locks` after the freed page is reclaimed oopses the kernel, and the pre-fix `WARN_ON_ONCE()` panics outright on the `panic_on_warn` configurations common in hardened and Android deployments. The permanently un-releasable stale lock also blocks any other process waiting via `F_SETLKW` on that inode indefinitely." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/locks.c" ], "versions": [ { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "d30ff33040834c3b9eee29740acd92f9c7ba2250", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "dc2ce1dfceaa0767211a9d963ddb029ab21c4235", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "5661b9c7ec189406c2dde00837aaa4672efb6240", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "52c87ab18c76c14d7209646ccb3283b3f5d87b22", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "ef8fc41cd6f95f9a4a3470f085aecf350569a0b3", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "5f5d0799eb0a01d550c21b7894e26b2d9db55763", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "b6d223942c34057fdfd8f149e763fa823731b224", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "3cad1bc010416c6dd780643476bc59ed742436b9", "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/locks.c" ], "versions": [ { "version": "2.6.13", "status": "affected" }, { "version": "0", "lessThan": "2.6.13", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.319", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.281", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.223", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.164", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.101", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.42", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.9", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "2.6.13", "versionEndExcluding": "4.19.319" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.4.281" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.10.223" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "5.15.164" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.1.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.6.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.9.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.13", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/d30ff33040834c3b9eee29740acd92f9c7ba2250" }, { "url": "https://git.kernel.org/stable/c/dc2ce1dfceaa0767211a9d963ddb029ab21c4235" }, { "url": "https://git.kernel.org/stable/c/5661b9c7ec189406c2dde00837aaa4672efb6240" }, { "url": "https://git.kernel.org/stable/c/52c87ab18c76c14d7209646ccb3283b3f5d87b22" }, { "url": "https://git.kernel.org/stable/c/ef8fc41cd6f95f9a4a3470f085aecf350569a0b3" }, { "url": "https://git.kernel.org/stable/c/5f5d0799eb0a01d550c21b7894e26b2d9db55763" }, { "url": "https://git.kernel.org/stable/c/b6d223942c34057fdfd8f149e763fa823731b224" }, { "url": "https://git.kernel.org/stable/c/3cad1bc010416c6dd780643476bc59ed742436b9" } ], "title": "filelock: Remove locks reliably when fcntl/close race is detected", "x_generator": { "engine": "bippy-1.2.0" } }, 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