bpf: Take mmap_lock in zap_pages()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74354
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:36 UTC
Updated2026-08-15 06:22:36 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Take mmap_lock in zap_pages() zap_vma_range() requires the owning mm's mmap_lock to be held. Taking mmap_read_lock under arena->lock would AB-BA against arena_vm_close() and arena_map_mmap(), both of which run with mmap_write_lock held and then acquire arena->lock. Instead drop arena->lock, mmget_not_zero() the vma's mm, take mmap_read_lock, and re-resolve the vma via find_vma() since it may have been unmapped or replaced while waiting. Track processed vmls with a per-call generation in vml->zap_gen and serialize zap_pages() callers with a new arena->zap_mutex so concurrent callers on different uaddr ranges do not mark each other's vmls processed before the zap is done.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 317460317a02a1af512697e6e964298dedd8a163 36b1d997866f6083d33934983aa2ce0a184ed642 git Not specified
CNA Linux Linux affected 317460317a02a1af512697e6e964298dedd8a163 80b89d0226a05e8b67969de99c31b51fcd54f76a git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/36b1d997866f6083d33934983aa2ce0a184ed642 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/80b89d0226a05e8b67969de99c31b51fcd54f76a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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