CVE-2025-68329

Description

In the Linux kernel, the following vulnerability has been resolved:tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAsWhen a VMA is split (e.g., by partial munmap or MAP_FIXED), the kernelcalls vm_ops->close on each portion. For trace buffer mappings, thisresults in ring_buffer_unmap() being called multiple times whilering_buffer_map() was only called once.This causes ring_buffer_unmap() to return -ENODEV on subsequent callsbecause user_mapped is already 0, triggering a WARN_ON.Trace buffer mappings cannot support partial mappings because the ringbuffer structure requires the complete buffer including the meta page.Fix this by adding a may_split callback that returns -EINVAL to preventVMA splits entirely.

Risk Information

Base Score

5.5

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.025

Associated Vulnerability

No records found

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234