cachefiles: Fix potential UAF/KASAN warning

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98117
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:42 UTC
Updated2026-09-25 11:17:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: cachefiles: Fix potential UAF/KASAN warning Currently, trace_cachefiles_coherency() is being passed a pointer to a __be64 lain over the coherency data in struct cachefiles_xattr so that it can display the first 8 bytes. However, the data is of variable length and could even be 0 bytes. This could lead to a UAF or KASAN warning. Fix this by making sure the buffer has room for at least 8 bytes and that those 8 bytes are pre-cleared. Further, those bytes are not 8-byte aligned, so fix the tracepoint to extract the data as four 2-byte words (they are 2-byte aligned) and reassemble the __be64. The compiler will convert this into a single 8-byte load where the CPU supports it.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 68d459e6e609c31f96a203dd6eec60c634f155e1 git Not specified
CNA Linux Linux affected 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 93488ea378b4427598cace558236c110515d743b git Not specified
CNA Linux Linux affected 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 a67632c8c2688d6e0091529bcefe54bc5ee80e9b git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/93488ea378b4427598cace558236c110515d743b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/68d459e6e609c31f96a203dd6eec60c634f155e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a67632c8c2688d6e0091529bcefe54bc5ee80e9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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