CVE-2026-23416 - mm/mseal: update VMA end correctly on merge

CVE-2026-23416 - mm/mseal: update VMA end correctly on merge

https://cvefeed.io/rssfeed/latest.atom / Thu, 04/02/2026 - 15:09
CVE ID :CVE-2026-23416
Published : April 2, 2026, 12:16 p.m. | 50 minutes ago
Description :In 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.
Severity: 0.0 | NA
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