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

Vulnerability from cvelistv5 – Published: 2025-10-01 07:42 – Updated: 2026-08-05 12:05
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
Assigner
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)
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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)
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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 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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T21:13:04+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": "212",
      "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": "2026-09-01T13:44:47Z",
      "cve": "CVE-2025-39902",
      "id": "CVE-2025-39902",
      "initial_release_date": "2025-10-01T23:23:13Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "602",
      "product_status:known_not_affected": "187",
      "product_status:recommended": "483",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39902",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39902.json",
      "version": "45"
    }
  }
}



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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.


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.