CVE-2026-53373
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, a vulnerability was found in the mmap_prepare mechanism where attempting to unmap a VMA during error handling in the mmap() function can cause warnings and an invalid state. The issue occurs when mmap_prepare is invoked from the mmap() hook of 'stacked' drivers (e.g., overlayfs, shm) because the VMA is not fully established in the maple tree.
Risk Assessment
This vulnerability may lead to system instability, kernel log warnings, and potential memory management issues, affecting applications that use mmap mechanisms in environments with overlayfs or shm.
Recommendation
It is recommended to immediately update the Linux kernel to a version containing the fix (commit with the patch). Monitor official security advisories from your Linux distribution for the appropriate package.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: mm/vma: do not try to unmap a VMA if mmap_prepare() invoked from mmap() The mmap_prepare hook functionality includes the ability to invoke mmap_prepare() from the mmap() hook of existing 'stacked' drivers, that is ones which are capable of calling the mmap hooks of other drivers/file systems (e.g. overlayfs, shm). As part of the mmap_prepare action functionality, we deal with errors by unmapping the VMA should one arise. This works in the usual mmap_prepare case, as we invoke this action at the last moment, when the VMA is established in the maple tree. However, the mmap() hook passes a not-fully-established VMA pointer to the caller (which is the motivation behind the mmap_prepare() work), which is detached. So attempting to unmap a VMA in this state will be problematic, with the most obvious symptom being a warning in vma_mark_detached(), because the VMA is already detached. It's also unncessary - the mmap() handler will clean up the VMA on error. So to fix this issue, this patch propagates whether or not an mmap action is being completed via the compatibility layer or directly. If the former, then we do not attempt VMA cleanup, if the latter, then we do. This patch also updates the userland VMA tests to reflect the change.