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CVE-2025-39902

mm/slub: avoid accessing metadata when pointer is invalid in object_err()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.4.299, 5.10.243, 5.15.192, 6.1.151, 6.6.105, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in 872f2c34ff232af1e65ad2df86d61163c8ffad42; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in f66012909e7bf383fcdc5850709ed5716073fdc4; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in 7e287256904ee796c9477e3ec92b07f236481ef3; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in 1f0797f17927b5cad0fb7eced422f9a7c30a3191; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in 0ef7058b4dc6fcef622ac23b45225db57f17b83f; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in dda6ec365ab04067adae40ef17015db447e90736; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in 3baa1da473e6e50281324ff1d332d1a07a3bb02e; From 81819f0fc8285a2a5a921c019e3e3d7b6169d225 · fixed in b4efccec8d06ceb10a7d34d7b1c449c569d53770

  • Linux Linux

    2.6.22

  • KernelLinux

    From 2.6.22 · fixed in 5.4.299; From 5.5.0 · fixed in 5.10.243; From 5.11.0 · fixed in 5.15.192; From 5.16.0 · fixed in 6.1.151; From 6.2.0 · fixed in 6.6.105; From 6.7.0 · fixed in 6.12.46; From 6.13.0 · fixed in 6.16.6

References 8

git.kernel.org