CVE-2025-39902 (GCVE-0-2025-39902)

Vulnerability from cvelistv5 – Published: 2025-10-01 07:42 – Updated: 2026-10-15 22:02
VLAI
Title
mm/slub: avoid accessing metadata when pointer is invalid in object_err()
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/slub: avoid accessing metadata when pointer is invalid in object_err() object_err() reports details of an object for further debugging, such as the freelist pointer, redzone, etc. However, if the pointer is invalid, attempting to access object metadata can lead to a crash since it does not point to a valid object. One known path to the crash is when alloc_consistency_checks() determines the pointer to the allocated object is invalid because of a freelist corruption, and calls object_err() to report it. The debug code should report and handle the corruption gracefully and not crash in the process. In case the pointer is NULL or check_valid_pointer() returns false for the pointer, only print the pointer value and skip accessing metadata.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:54 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < 872f2c34ff232af1e65ad2df86d61163c8ffad42 (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < f66012909e7bf383fcdc5850709ed5716073fdc4 (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < 7e287256904ee796c9477e3ec92b07f236481ef3 (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < 1f0797f17927b5cad0fb7eced422f9a7c30a3191 (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < 0ef7058b4dc6fcef622ac23b45225db57f17b83f (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < dda6ec365ab04067adae40ef17015db447e90736 (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < 3baa1da473e6e50281324ff1d332d1a07a3bb02e (git)
Affected: 81819f0fc8285a2a5a921c019e3e3d7b6169d225 , < b4efccec8d06ceb10a7d34d7b1c449c569d53770 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.22
Unaffected: 0 , < 2.6.22 (semver)
Unaffected: 5.4.299 , ≤ 5.4.* (semver)
Unaffected: 5.10.243 , ≤ 5.10.* (semver)
Unaffected: 5.15.192 , ≤ 5.15.* (semver)
Unaffected: 6.1.151 , ≤ 6.1.* (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T17:44:33.198Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "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"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-39902",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:54:38.930497Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T22:02:32.999Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/slub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "872f2c34ff232af1e65ad2df86d61163c8ffad42",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "f66012909e7bf383fcdc5850709ed5716073fdc4",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "7e287256904ee796c9477e3ec92b07f236481ef3",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "1f0797f17927b5cad0fb7eced422f9a7c30a3191",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "0ef7058b4dc6fcef622ac23b45225db57f17b83f",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "dda6ec365ab04067adae40ef17015db447e90736",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "3baa1da473e6e50281324ff1d332d1a07a3bb02e",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            },
            {
              "lessThan": "b4efccec8d06ceb10a7d34d7b1c449c569d53770",
              "status": "affected",
              "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/slub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.22"
            },
            {
              "lessThan": "2.6.22",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.299",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.243",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.192",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.46",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.16.*",
              "status": "unaffected",
              "version": "6.16.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.299",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.243",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.192",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.151",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.105",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.46",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16.6",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17",
                  "versionStartIncluding": "2.6.22",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is in the SLUB allocator\u0027s debug reporting path, reached from `___slab_alloc` when a local attacker\u0027s 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\u0027s 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-\u003elist_lock`, which is an unrecoverable crash rather than the graceful corruption report the code intended."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:05:59.784Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-39902",
    "datePublished": "2025-10-01T07:42:49.415Z",
    "dateReserved": "2025-04-16T07:20:57.146Z",
    "dateUpdated": "2026-10-15T22:02:32.999Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-39902",
      "date": "2026-11-14",
      "epss": "0.00167",
      "percentile": "0.06055"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "mm/slub.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "872f2c34ff232af1e65ad2df86d61163c8ffad42",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f66012909e7bf383fcdc5850709ed5716073fdc4",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "7e287256904ee796c9477e3ec92b07f236481ef3",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "1f0797f17927b5cad0fb7eced422f9a7c30a3191",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "0ef7058b4dc6fcef622ac23b45225db57f17b83f",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "dda6ec365ab04067adae40ef17015db447e90736",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "3baa1da473e6e50281324ff1d332d1a07a3bb02e",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "b4efccec8d06ceb10a7d34d7b1c449c569d53770",
                    "status": "affected",
                    "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "mm/slub.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "2.6.22"
                  },
                  {
                    "lessThan": "2.6.22",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.4.*",
                    "status": "unaffected",
                    "version": "5.4.299",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.10.*",
                    "status": "unaffected",
                    "version": "5.10.243",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.192",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.151",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.105",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.46",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.16.*",
                    "status": "unaffected",
                    "version": "6.16.6",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.17",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6E6505A1-1A82-4CE4-A959-9D1B9E2BDE81",
                    "versionEndExcluding": "5.4.299",
                    "versionStartIncluding": "2.6.22",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6DE4B49A-F1A3-4F0C-96D3-68676CE6BB4C",
                    "versionEndExcluding": "5.10.243",
                    "versionStartIncluding": "5.5",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "8A911BD7-361F-45C0-A4A6-33FCBA0F6117",
                    "versionEndExcluding": "5.15.192",
                    "versionStartIncluding": "5.11",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "BC2D0B88-F133-4143-B91D-0A439AA143C0",
                    "versionEndExcluding": "6.1.151",
                    "versionStartIncluding": "5.16",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B9364B0C-6B18-422E-8254-73EF0E856875",
                    "versionEndExcluding": "6.6.105",
                    "versionStartIncluding": "6.2",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "F7E2B332-E920-4CAC-B400-288602DB6F16",
                    "versionEndExcluding": "6.12.46",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "548F104C-0F08-438B-9C97-64C903F0C678",
                    "versionEndExcluding": "6.16.6",
                    "versionStartIncluding": "6.13",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "327D22EF-390B-454C-BD31-2ED23C998A1C",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "C730CD9A-D969-4A8E-9522-162AAF7C0EE9",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "39982C4B-716E-4B2F-8196-FA301F47807D",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*",
                    "matchCriteriaId": "340BEEA9-D70D-4290-B502-FBB1032353B1",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          },
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*",
                    "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/slub: evitar acceder a metadatos cuando el puntero es inv\u00e1lido en object_err()\n\nobject_err() informa detalles de un objeto para depuraci\u00f3n adicional, como el puntero de la freelist, la redzone, etc. Sin embargo, si el puntero es inv\u00e1lido, intentar acceder a los metadatos del objeto puede provocar un fallo ya que no apunta a un objeto v\u00e1lido.\n\nUna ruta conocida al fallo es cuando alloc_consistency_checks() determina que el puntero al objeto asignado es inv\u00e1lido debido a una corrupci\u00f3n de la freelist, y llama a object_err() para informarlo. El c\u00f3digo de depuraci\u00f3n deber\u00eda informar y manejar la corrupci\u00f3n de manera elegante y no fallar en el proceso.\n\nEn caso de que el puntero sea NULL o check_valid_pointer() devuelva falso para el puntero, solo imprimir el valor del puntero y omitir el acceso a los metadatos."
          }
        ],
        "id": "CVE-2025-39902",
        "lastModified": "2026-10-19T21:10:00.160",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2025-39902",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:54:38.930497Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-10-01T08:15:32.993",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T15:12:43+00:00",
      "cve": "CVE-2025-39902",
      "id": "CVE-2025-39902",
      "initial_release_date": "2025-10-01T00:00:00+00:00",
      "product_status:fixed": "150",
      "product_status:known_affected": "138",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/slub: avoid accessing metadata when pointer is invalid in object_err()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39902.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-05T01:34:57Z",
      "cve": "CVE-2025-39902",
      "id": "CVE-2025-39902",
      "initial_release_date": "2025-10-01T23:23:13Z",
      "product_status:known_affected": "604",
      "product_status:known_not_affected": "187",
      "product_status:recommended": "514",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39902",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-39902.json",
      "version": "50"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T17:44:33.198Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "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"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-39902",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:54:38.930497Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:54:39.630Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "mm/slub.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "872f2c34ff232af1e65ad2df86d61163c8ffad42",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "f66012909e7bf383fcdc5850709ed5716073fdc4",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "7e287256904ee796c9477e3ec92b07f236481ef3",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "1f0797f17927b5cad0fb7eced422f9a7c30a3191",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "0ef7058b4dc6fcef622ac23b45225db57f17b83f",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "dda6ec365ab04067adae40ef17015db447e90736",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "3baa1da473e6e50281324ff1d332d1a07a3bb02e",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                },
                {
                  "lessThan": "b4efccec8d06ceb10a7d34d7b1c449c569d53770",
                  "status": "affected",
                  "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "mm/slub.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.22"
                },
                {
                  "lessThan": "2.6.22",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.299",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.243",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.192",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.151",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.105",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.46",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.16.*",
                  "status": "unaffected",
                  "version": "6.16.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.17",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.299",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.243",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.192",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.151",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.105",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.46",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.16.6",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17",
                      "versionStartIncluding": "2.6.22",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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": {
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable code is in the SLUB allocator\u0027s debug reporting path, reached from `___slab_alloc` when a local attacker\u0027s 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\u0027s 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-\u003elist_lock`, which is an unrecoverable crash rather than the graceful corruption report the code intended."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:05:59.784Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "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"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-39902",
        "datePublished": "2025-10-01T07:42:49.415Z",
        "dateReserved": "2025-04-16T07:20:57.146Z",
        "dateUpdated": "2026-10-15T22:02:32.999Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.