{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-39902",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-39902"
  ],
  "published": "2025-10-01T07:43:27Z",
  "summary": "mm/slub: avoid accessing metadata when pointer is invalid in object_err()",
  "details": "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-39902"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42"
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      "url": "https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4"
    },
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      "url": "https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191"
    },
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      "url": "https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f"
    },
    {
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      "url": "https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736"
    },
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      "url": "https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e"
    },
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  "database_specific": {
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    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "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 \u2014 `print_section()` on \"Redzone\", \"Object\" (up to PAGE_SIZE bytes), and \"Padding\", plus `struct track` contents and `get_freepointer()` \u2014 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."
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}