CVE-2026-46100
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, a vulnerability was discovered in the AFS filesystem involving a refcount leak during mmap operations. The issue stems from a partial revert of a previous change, as the .mmap_prepare call could incorrectly increment the refcount if a subsequent merge or allocation failure occurred. The previous behavior was restored pending full .mmap_prepare support.
Risk Assessment
The refcount leak may lead to resource exhaustion and potential kernel instability, especially in environments heavily using the AFS filesystem. Administrators should apply the patch to avoid system crash risks.
Recommendation
Update the Linux kernel to a version containing the fix for CVE-2026-46100. If immediate update is not possible, consider limiting AFS filesystem usage until the patch is deployed.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: fs: afs: revert mmap_prepare() change Partially reverts commit 9d5403b1036c ("fs: convert most other generic_file_*mmap() users to .mmap_prepare()"). This is because the .mmap invocation establishes a refcount, but .mmap_prepare is called at a point where a merge or an allocation failure might happen after the call, which would leak the refcount increment. Functionality is being added to permit the use of .mmap_prepare in this case, but in the interim, we need to fix this.