mm/mseal: update VMA end correctly on merge

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Summary

CVECVE-2026-23416
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 12:16:20 UTC
Updated2026-04-02 12:16:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/mseal: update VMA end correctly on merge Previously we stored the end of the current VMA in curr_end, and then upon iterating to the next VMA updated curr_start to curr_end to advance to the next VMA. However, this doesn't take into account the fact that a VMA might be updated due to a merge by vma_modify_flags(), which can result in curr_end being stale and thus, upon setting curr_start to curr_end, ending up with an incorrect curr_start on the next iteration. Resolve the issue by setting curr_end to vma->vm_end unconditionally to ensure this value remains updated should this occur. While we're here, eliminate this entire class of bug by simply setting const curr_[start/end] to be clamped to the input range and VMAs, which also happens to simplify the logic.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 6c2da14ae1e0a0146587381594559027bd46c059 40b3f4700e5535fbe74738cebb9379a40ec66bed git Not specified
CNA Linux Linux affected 6c2da14ae1e0a0146587381594559027bd46c059 83737e34b83a23b2a9bcf586b058b2c2a54c7c6b git Not specified
CNA Linux Linux affected 6c2da14ae1e0a0146587381594559027bd46c059 2697dd8ae721db4f6a53d4f4cbd438212a80f8dc git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2697dd8ae721db4f6a53d4f4cbd438212a80f8dc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83737e34b83a23b2a9bcf586b058b2c2a54c7c6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/40b3f4700e5535fbe74738cebb9379a40ec66bed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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