CVE-2025-39902

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.

CVSS 3.1

5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.2% chance of exploitation in the next 30 days; higher than 5% of CVEs (scores of 2026-10-25)

CWE

CWE-476

Published

2025-10-01

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• debian:debian_linux
• linux:linux_kernel

References

• https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f
• https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191
• https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e
• https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3
• https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42

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