CVE-2026-98117

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 < 68d459e6e609c31f96a203dd6eec60c634f155e1affected
LinuxLinux229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 < 93488ea378b4427598cace558236c110515d743baffected
LinuxLinux229105e5cfd9832a9ef1368c96e0098ec3a5fbf0 < a67632c8c2688d6e0091529bcefe54bc5ee80e9baffected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References