CVE-2024-41020

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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 \u2014 planting the stale lock and reading `/proc/locks` \u2014 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 \u2014 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": 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same fix to the compat path for 32-bit kernels."}, {"lang": "es", "value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: filelock: corrige la ruta de compatibilidad de recuperaci\u00f3n de fcntl/close race Cuando escrib\u00ed la confirmaci\u00f3n 3cad1bc01041 (\"filelock: elimina los bloqueos de manera confiable cuando se detecta fcntl/close race\"), me perd\u00ed que hay dos copias del c\u00f3digo que estaba parcheando: la versi\u00f3n normal y la versi\u00f3n para compensaciones de 64 bits en n\u00facleos de 32 bits. Gracias a Greg KH por tropezar con esto mientras hac\u00eda el backport estable... Aplique exactamente la misma soluci\u00f3n a la ruta de compatibilidad para kernels de 32 bits."}], "id": "CVE-2024-41020", "lastModified": "2026-08-04T11:19:18.830", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-41020", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T16:24:28.681942Z", "version": "2.0.3"}}]}, "published": "2024-07-29T14:15:03.773", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c43ad4ab41602201d34c66ac62130fe339d686f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53e21cfa68a7d12de378b7116c75571f73e0dfa2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b0af8e4c70e4b884bb94ff5f0cd49ecf1273c02"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73ae349534ebc377328e7d21891e589626c6e82c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/911cc83e56a2de5a40758766c6a70d6998248860"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a561145f3ae973ebf3e0aee41624e92a6c5cb38d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed898f9ca3fa32c56c858b463ceb9d9936cc69c4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4d0775c6e2f1340ca0725f0337de149aaa989ca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8138f2ad2f745b9a1c696a05b749eabe44337ea"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4c43ad4ab41602201d34c66ac62130fe339d686f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/53e21cfa68a7d12de378b7116c75571f73e0dfa2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5b0af8e4c70e4b884bb94ff5f0cd49ecf1273c02"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/73ae349534ebc377328e7d21891e589626c6e82c"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/911cc83e56a2de5a40758766c6a70d6998248860"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a561145f3ae973ebf3e0aee41624e92a6c5cb38d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ed898f9ca3fa32c56c858b463ceb9d9936cc69c4"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f4d0775c6e2f1340ca0725f0337de149aaa989ca"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f8138f2ad2f745b9a1c696a05b749eabe44337ea"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:9315", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}, {"advisory": "RHSA-2024:9315", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-503.11.1.el9_5", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-11-12T00:00:00Z"}], "bugzilla": {"description": "kernel: filelock: Fix fcntl/close race recovery compat path", "id": "2300363", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2300363"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "(CWE-362|CWE-667)", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nfilelock: Fix fcntl/close race recovery compat path\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...\nApply exactly the same fix to the compat path for 32-bit kernels."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2024-41020", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-41020\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-41020\nhttps://lore.kernel.org/linux-cve-announce/2024072927-CVE-2024-41020-52c6@gregkh/T"], "threat_severity": "Moderate"}

{}