fsnotify: do not generate ACCESS/MODIFY events on child for special files

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-68788
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-13 16:15:58 UTC
Updated2026-07-14 13:18:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fsnotify: do not generate ACCESS/MODIFY events on child for special files inotify/fanotify do not allow users with no read access to a file to subscribe to events (e.g. IN_ACCESS/IN_MODIFY), but they do allow the same user to subscribe for watching events on children when the user has access to the parent directory (e.g. /dev). Users with no read access to a file but with read access to its parent directory can still stat the file and see if it was accessed/modified via atime/mtime change. The same is not true for special files (e.g. /dev/null). Users will not generally observe atime/mtime changes when other users read/write to special files, only when someone sets atime/mtime via utimensat(). Align fsnotify events with this stat behavior and do not generate ACCESS/MODIFY events to parent watchers on read/write of special files. The events are still generated to parent watchers on utimensat(). This closes some side-channels that could be possibly used for information exfiltration [1]. [1] https://snee.la/pdf/pubs/file-notification-attacks.pdf

Risk And Classification

EPSS: 0.001730000 probability, percentile 0.069490000 (date 2026-07-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc df2711544b050aba703e6da418c53c7dc5d443ca git Not specified
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc 859bdf438f01d9aa7f84b09c1202d548c7cad9e8 git Not specified
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc 6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91 git Not specified
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc e0643d46759db8b84c0504a676043e5e341b6c81 git Not specified
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc 82f7416bcbd951549e758d15fc1a96a5afc2e900 git Not specified
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc 7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6 git Not specified
CNA Linux Linux affected 72acc854427948efed7a83da27f7dc3239ac9afc 635bc4def026a24e071436f4f356ea08c0eed6ff git Not specified
CNA Linux Linux affected 2.6.36 Not specified
CNA Linux Linux unaffected 2.6.36 semver Not specified
CNA Linux Linux unaffected 5.10.248 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.198 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.160 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.120 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.64 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.3 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.6 * custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.6 * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/859bdf438f01d9aa7f84b09c1202d548c7cad9e8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a93edb23bcf07a3aaf8b598edfc2faa8fbcc0b6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df2711544b050aba703e6da418c53c7dc5d443ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
cert-portal.siemens.com/productcert/html/ssa-019113.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/6a7d7d96eeeab7af2bd01afbb3d9878a11a13d91 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82f7416bcbd951549e758d15fc1a96a5afc2e900 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/635bc4def026a24e071436f4f356ea08c0eed6ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e0643d46759db8b84c0504a676043e5e341b6c81 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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