CVE-2026-23380

Advisory lineage Upstream: 0 Downstream: 3
Analyzed
Published: 25 Mar 2026, 10:27
Last modified:11 May 2026, 22:05

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
0.11% LOW
0% probability +0.10%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Mar 2026, 10:27
Published
Vulnerability first disclosed
11 May 2026, 22:05
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix WARN_ON in tracing_buffers_mmap_close When a process forks, the child process copies the parent's VMAs but the user_mapped reference count is not incremented. As a result, when both the parent and child processes exit, tracing_buffers_mmap_close() is called twice. On the second call, user_mapped is already 0, causing the function to return -ENODEV and triggering a WARN_ON. Normally, this isn't an issue as the memory is mapped with VM_DONTCOPY set. But this is only a hint, and the application can call madvise(MADVISE_DOFORK) which resets the VM_DONTCOPY flag. When the application does that, it can trigger this issue on fork. Fix it by incrementing the user_mapped reference count without re-mapping the pages in the VMA's open callback.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.11%• Percentile: 2%

Techniques & Countermeasures

  • CWE-617•Reachable Assertion

    The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.

Affected Systems

  • linux•linux

    ≥ cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < 91f3e8d84c89918769e71393f839c9fefadc2580 | ≥ cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < cdd96641b64297a2db42676f051362b76280a58b | ≥ cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < b0f269ba6fefe9e3cb9feedcf78fcd0b633800c0 | ≥ cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64, < e39bb9e02b68942f8e9359d2a3efe7d37ae6be0e | 6.10

  • linux•linux_kernel

    ≥ 6.10.1, < 6.12.77 | ≥ 6.13, < 6.18.17 | ≥ 6.19, < 6.19.7 | 6.10 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7

References (4)