{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-39902", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T07:20:57.146Z", "datePublished": "2025-10-01T07:42:49.415Z", "dateUpdated": "2026-08-05T12:05:59.784Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:05:59.784Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid accessing metadata when pointer is invalid in object_err()\n\nobject_err() reports details of an object for further debugging, such as\nthe freelist pointer, redzone, etc. However, if the pointer is invalid,\nattempting to access object metadata can lead to a crash since it does\nnot point to a valid object.\n\nOne known path to the crash is when alloc_consistency_checks()\ndetermines the pointer to the allocated object is invalid because of a\nfreelist corruption, and calls object_err() to report it. The debug code\nshould report and handle the corruption gracefully and not crash in the\nprocess.\n\nIn case the pointer is NULL or check_valid_pointer() returns false for\nthe pointer, only print the pointer value and skip accessing metadata." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is in the SLUB allocator's debug reporting path, reached from `___slab_alloc` when a local attacker's heap-corruption primitive (slab overflow, double free, or UAF) has poisoned a freelist pointer; no remote or adjacent network input reaches `object_err()` directly.\nAC:L - The attacker who corrupts the freelist fully controls the invalid pointer value and can force `check_valid_pointer()` to fail deterministically on the very next allocation from that slab, triggering the wild dereference reliably and repeatedly; on any deployment booted with `slab_debug`/`CONFIG_SLUB_DEBUG_ON` (Android userdebug, distro debug kernels, embedded and automotive bring-up images, CI fleets) no attacker-uncontrollable condition remains.\nPR:L - Reaching the slab allocator requires only that the attacker run code that allocates kernel memory, and the freelist-corrupting primitives that lead here are routinely reachable by unprivileged local users through ordinary syscalls; no capability check exists anywhere on the path from `kmem_cache_alloc()` to `object_err()`.\nUI:N - The attacker triggers the corruption and the subsequent allocation from its own process; no victim action, mount, or file open is required.\nS:U - The faulting read and its consequences are entirely within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `print_trailer()` hex-dumps memory at the attacker-influenced pointer — `print_section()` on \"Redzone\", \"Object\" (up to PAGE_SIZE bytes), and \"Padding\", plus `struct track` contents and `get_freepointer()` — straight into the kernel log, so an attacker who chooses the freepointer value (plaintext absent `CONFIG_SLAB_FREELIST_HARDENED`) obtains an out-of-bounds read of arbitrary kernel memory disclosing pointers, canaries, and secrets.\nI:N - Every access on the buggy path (`print_tracking`, `get_freepointer`, `print_section`) is a read; the `set_freepointer()` fixups in `check_object()`/`on_freelist()` operate on already-validated pointers, so this defect yields no kernel write primitive of its own.\nA:H - Dereferencing the invalid pointer in `print_tracking()`/`print_section()` faults on unmapped or non-canonical memory, oopsing the kernel from inside the allocator slow path while holding `n->list_lock`, which is an unrecoverable crash rather than the graceful corruption report the code intended." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slub.c" ], "versions": [ { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "872f2c34ff232af1e65ad2df86d61163c8ffad42", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "f66012909e7bf383fcdc5850709ed5716073fdc4", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "7e287256904ee796c9477e3ec92b07f236481ef3", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "1f0797f17927b5cad0fb7eced422f9a7c30a3191", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "0ef7058b4dc6fcef622ac23b45225db57f17b83f", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "dda6ec365ab04067adae40ef17015db447e90736", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "3baa1da473e6e50281324ff1d332d1a07a3bb02e", "status": "affected", "versionType": "git" }, { "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225", "lessThan": "b4efccec8d06ceb10a7d34d7b1c449c569d53770", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "mm/slub.c" ], "versions": [ { "version": "2.6.22", "status": "affected" }, { "version": "0", "lessThan": "2.6.22", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.299", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.243", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.192", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.151", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.105", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.46", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.6", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "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": "2.6.22", "versionEndExcluding": "5.4.299" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.10.243" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.15.192" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.1.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.6.105" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.12.46" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.16.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42" }, { "url": "https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4" }, { "url": "https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3" }, { "url": "https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191" }, { "url": "https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f" }, { "url": "https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736" }, { "url": "https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e" }, { "url": "https://git.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770" } ], "title": "mm/slub: avoid accessing metadata when pointer is invalid in object_err()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:44:33.198Z" } } ] } }