debugfs: Fix lockdown check for mmap_prepare

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89745
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:05 UTC
Updated2026-09-11 20:20:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: debugfs: Fix lockdown check for mmap_prepare Commit 651fdda8406d ("relay: update relay to use mmap_prepare") changed the `mmap` file operation to `mmap_prepare` for relayfs, but the lockdown check in debugfs was not updated accordingly. This prevents debugfs from being locked down when the kernel is in integrity mode if a file uses `mmap_prepare` but not `mmap`. Since the conversion to `mmap_prepare` across the kernel is not yet complete, update the lockdown check to look for both `mmap` and `mmap_prepare` to ensure comprehensive coverage.

Risk And Classification

EPSS: 0.001550000 probability, percentile 0.050070000 (date 2026-09-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 651fdda8406d42a5004c5c79f269540a85d6a1ab e7f6a6b5741d16fdac7adaecbe0fa52ae756f208 git Not specified
CNA Linux Linux affected 651fdda8406d42a5004c5c79f269540a85d6a1ab f81808de37338aac8e167f99bfae647b1b835c70 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e7f6a6b5741d16fdac7adaecbe0fa52ae756f208 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f81808de37338aac8e167f99bfae647b1b835c70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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