CVE-2026-98117 is a vulnerability in Linux Kernel
Published on September 25, 2026
cachefiles: Fix potential UAF/KASAN warning
In 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.
Products Associated with CVE-2026-98117
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Affected Versions
Linux:- Version 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 and below 68d459e6e609c31f96a203dd6eec60c634f155e1 is affected.
- Version 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 and below 93488ea378b4427598cace558236c110515d743b is affected.
- Version 229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 and below a67632c8c2688d6e0091529bcefe54bc5ee80e9b is affected.
- Version 6.14 is affected.
- Before 6.14 is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc3, <= * is unaffected.