CVE-2026-64299

In the Linux kernel, the following vulnerability has been resolved:

tracing: Prevent out-of-bounds read in glob matching

String event fields are not necessarily NUL-terminated, so the filter

predicate functions (filter_pred_string(), filter_pred_strloc() and

filter_pred_strrelloc()) pass the field length to the regex match

callbacks, and the length-aware matchers honour it.

regex_match_glob() was the exception: it ignored the length and called

glob_match(), which scans the string until it hits a NUL byte. Some

string fields are not NUL-terminated. One example is the dynamic char

array of the xfs_* namespace tracepoints, which is copied without a

trailing NUL. For such a field, glob matching reads past the end of

the event field, causing a KASAN slab-out-of-bounds read in

glob_match(), reached via regex_match_glob() and filter_match_preds()

from the xfs_lookup tracepoint.

Add a length-bounded glob_match_len() and use it from regex_match_glob()

so glob matching always stops at the field boundary. The matching loop

is factored into a shared helper so glob_match() keeps its behaviour.