CVE-2024-53136

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It is causing deadlocks when accessing tmpfs over\nNFS.\n\nAs Hugh commented, \"added just to silence a syzbot sanitizer splat: added\nwhere there has never been any practical problem\"."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The deadlock is triggered by nfsd processing NFS RPCs from a remote client over TCP/2049 against a tmpfs export \u2014 `nfsd_setattr()`/`nfsd_create()`/`nfsd_unlink()`/`nfsd_rename()` hold `i_rwsem` for write and then call `vfs_getattr()` on the same inode. A remote NFS client issuing a single CREATE or SETATTR hangs the server.\nAC:L - This is a deterministic recursive rwsem acquisition (`down_write` then `down_read` on the same lock by the same task), not a race \u2014 every metadata-modifying NFS operation on a tmpfs export deadlocks 100% of the time on the first attempt.\nPR:N - NFSv3/NFSv4 with AUTH_SYS performs no cryptographic authentication \u2014 a client permitted by the export simply asserts a UID, so no credentials on the server are required; a world-writable or anon-squashed tmpfs export lets an entirely unauthenticated remote peer reach `fh_fill_pre_attrs()` under the held inode lock.\nUI:N - The attacker sends the NFS request directly; no action by a local user or administrator is needed at exploit time, only the pre-existing tmpfs export configuration.\nS:U - The deadlocked task, the held `i_rwsem`, and all resulting hangs are within the kernel's own security authority; no boundary between security scopes is crossed.\nC:N - The bug is a lock-ordering/recursion deadlock with no out-of-bounds access, no freed-memory reuse, and no data returned to the attacker \u2014 nothing is disclosed.\nI:N - No memory corruption or unauthorized modification occurs; the operation simply never completes, so no data is written incorrectly.\nA:H - The nfsd thread blocks unkillably in `TASK_UNINTERRUPTIBLE` while holding the inode's `i_rwsem` forever, wedging every further access to that inode from both NFS clients and local processes and exhausting nfsd threads \u2014 a permanent, unrecoverable denial of service requiring a reboot."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["mm/shmem.c"], "versions": [{"version": "9fb9703cd43ee20a6de8ccdef991677b7274cec0", "lessThan": "36b537e8f302f670c7cf35d88a3a294443e32d52", "status": "affected", "versionType": "git"}, {"version": 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It is causing deadlocks when accessing tmpfs over\nNFS.\n\nAs Hugh commented, \"added just to silence a syzbot sanitizer splat: added\nwhere there has never been any practical problem\"."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: revert \"mm: shmem: fix data-race in shmem_getattr()\" Revert d949d1d14fa2 (\"mm: shmem: fix data-race in shmem_getattr()\") como lo sugiri\u00f3 Chuck [1]. Est\u00e1 causando bloqueos al acceder a tmpfs a trav\u00e9s de NFS. Como coment\u00f3 Hugh, \"agregado solo para silenciar un splat de sanitizador de syzbot: agregado donde nunca ha habido ning\u00fan problema pr\u00e1ctico\"."}], "id": "CVE-2024-53136", "lastModified": "2026-08-04T11:21:57.137", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "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"}]}, "published": "2024-12-04T15:15:13.737", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/36b537e8f302f670c7cf35d88a3a294443e32d52"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/57cc8d253099d1b8627f0fb487ee011d9158ccc9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5874c1150e77296565ad6e495ef41fbf87570d14"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/64e67e8694252c1bf01b802ee911be3fee62c36b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/901dc2ad7c3789fa87dc3956f6697c5d62d5cf7e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a3c65022d89d5baa2cea8e87a6de983ea305f14c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d1aa0c04294e29883d65eac6c2f72fe95cc7c049"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d3f9d88c2c03b2646ace336236adca19f7697bd3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.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-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: mm: revert \"mm: shmem: fix data-race in shmem_getattr()\"", "id": "2330346", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2330346"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-362", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nmm: revert \"mm: shmem: fix data-race in shmem_getattr()\"\nRevert d949d1d14fa2 (\"mm: shmem: fix data-race in shmem_getattr()\") as\nsuggested by Chuck [1]. It is causing deadlocks when accessing tmpfs over\nNFS.\nAs Hugh commented, \"added just to silence a syzbot sanitizer splat: added\nwhere there has never been any practical problem\"."], "name": "CVE-2024-53136", "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": "2024-12-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-53136\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-53136\nhttps://lore.kernel.org/linux-cve-announce/2024120452-CVE-2024-53136-f7f8@gregkh/T"], "threat_severity": "Moderate"}

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