{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-41020", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.613Z", "datePublished": "2024-07-29T13:34:21.617Z", "dateUpdated": "2026-08-05T11:34:46.395Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:34:46.395Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfilelock: Fix fcntl/close race recovery compat path\n\nWhen I wrote commit 3cad1bc01041 (\"filelock: Remove locks reliably when\nfcntl/close race is detected\"), I missed that there are two copies of the\ncode I was patching: The normal version, and the version for 64-bit offsets\non 32-bit kernels.\nThanks to Greg KH for stumbling over this while doing the stable\nbackport...\n\nApply exactly the same fix to the compat path for 32-bit kernels." } ], "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 vulnerable code is reached only through the local `fcntl64(F_SETLK64/F_SETLKW64)` syscall racing a local `close()`; there is no remote or adjacent-network entry point into `fcntl_setlk64()`.\nAC:L - The attacker owns both sides of the race (one thread calling fcntl64, another calling close on the same fd) and can retry indefinitely, needing only one win to plant a permanent stale lock; the extra condition that makes the recovery unlock fail is also attacker-driven (concurrent relabel under SELinux/Smack enforcing, a killable signal during `nfs_iocounter_wait()` on an NFS mount, or a co-thread creating the merged range that forces an allocating split).\nPR:L - Any unprivileged local user can call fcntl64/close on a file it may open, and can read the world-readable `/proc/locks` to drive the use-after-free; no capability, LSM privilege, or namespace access is required.\nUI:N - The attacker performs every step itself — planting the stale lock and reading `/proc/locks` — with no victim action needed; unrelated tooling (`lslocks`, `lsof`, systemd, monitoring agents) reading `/proc/locks` merely widens the blast radius.\nS:U - The dangling `file_lock` and the resulting reads stay within the kernel's own security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - After the leak, `lock_get_status()` dereferences the freed `struct file` and then the pointer it yields, printing `s_dev` and `i_ino` from attacker-groomed memory to userspace — a repeatable arbitrary kernel-memory read oracle, as the reporter states it \"can likely be used to read arbitrary kernel memory.\"\nI:H - This is a use-after-free on `flc_file`/`flc_owner`; the freed `files_struct` slot can be reoccupied by another (possibly privileged) process, which then owns and mutates the stale lock, and the attacker leaves a permanent, unremovable POSIX lock corrupting kernel-managed lock state relied on by other principals.\nA:H - Dereferencing the wild `flc_file`/`i_sb` pointers oopses inside `lock_get_status()` while `blocked_lock_lock` and `file_rwsem` are held for write, hanging or panicking the entire system, and the stale lock persists so the crash is triggerable by any `/proc/locks` reader." } ] } ], "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": "a561145f3ae973ebf3e0aee41624e92a6c5cb38d", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "4c43ad4ab41602201d34c66ac62130fe339d686f", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "911cc83e56a2de5a40758766c6a70d6998248860", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "53e21cfa68a7d12de378b7116c75571f73e0dfa2", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "f4d0775c6e2f1340ca0725f0337de149aaa989ca", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "73ae349534ebc377328e7d21891e589626c6e82c", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "5b0af8e4c70e4b884bb94ff5f0cd49ecf1273c02", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "ed898f9ca3fa32c56c858b463ceb9d9936cc69c4", "status": "affected", "versionType": "git" }, { "version": "c293621bbf678a3d85e3ed721c3921c8a670610d", "lessThan": "f8138f2ad2f745b9a1c696a05b749eabe44337ea", "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": "6.1.102", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.43", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.12", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.2", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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" }, 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"https://git.kernel.org/stable/c/a561145f3ae973ebf3e0aee41624e92a6c5cb38d" }, { "url": "https://git.kernel.org/stable/c/4c43ad4ab41602201d34c66ac62130fe339d686f" }, { "url": "https://git.kernel.org/stable/c/911cc83e56a2de5a40758766c6a70d6998248860" }, { "url": "https://git.kernel.org/stable/c/53e21cfa68a7d12de378b7116c75571f73e0dfa2" }, { "url": "https://git.kernel.org/stable/c/f4d0775c6e2f1340ca0725f0337de149aaa989ca" }, { "url": "https://git.kernel.org/stable/c/73ae349534ebc377328e7d21891e589626c6e82c" }, { "url": "https://git.kernel.org/stable/c/5b0af8e4c70e4b884bb94ff5f0cd49ecf1273c02" }, { "url": "https://git.kernel.org/stable/c/ed898f9ca3fa32c56c858b463ceb9d9936cc69c4" }, { "url": "https://git.kernel.org/stable/c/f8138f2ad2f745b9a1c696a05b749eabe44337ea" } ], "title": "filelock: Fix fcntl/close race recovery compat path", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": 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