CVE-2026-23380 (GCVE-0-2026-23380)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-04-13 06:06
VLAI?
Title
tracing: Fix WARN_ON in tracing_buffers_mmap_close
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < 91f3e8d84c89918769e71393f839c9fefadc2580 (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < cdd96641b64297a2db42676f051362b76280a58b (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < b0f269ba6fefe9e3cb9feedcf78fcd0b633800c0 (git)
Affected: cf9f0f7c4c5bb45e7bb270e48bab6f7837825a64 , < e39bb9e02b68942f8e9359d2a3efe7d37ae6be0e (git)
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    Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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    "dateReserved": "2026-01-13T15:37:46.007Z",
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}


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  • 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.
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