Linux Kernel: Reject Incomplete Tracing Event Filter Expressions
CVE-2026-99236 Published on November 2, 2026
tracing: Reject incomplete event filter expressions
In the Linux kernel, the following vulnerability has been resolved:
tracing: Reject incomplete event filter expressions
A non-empty expression normally finishes in predicate_parse()'s inner
loop, which resolves the pending logical operators before jumping to
finalization. If the input ends after an operator, possibly followed by
unary '!' tokens, the outer loop instead falls through with unresolved
operator state.
For example, "common_pid == 1 || common_pid == 2 &&" leaves
prog[0].target equal to -1. The second pass then reads prog[-1] before
the forward-jump check can reject it. Depending on adjacent slab
contents, it can also copy an out-of-bounds word into a branch target
that passes the forward-only check. A self-targeted perf tracepoint
counting event can reach this path through PERF_EVENT_IOC_SET_FILTER.
Reject the outer-loop fallthrough when a predicate has already been
parsed. This ensures that non-empty expressions only reach finalization
after the inner loop has resolved their operators. Keep the existing
no-filter error for input that has no predicates. Add a regression test
for trailing logical operators and unary negations.
Products Associated with CVE-2026-99236
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Affected Versions
Linux:- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 4a1a6d35359991c5d47f4bf101cfbe1475c94093 is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 2a98f5d4913ec081e08e1075512cb7ec313d9f72 is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 15ff3cc7f2beecc3f95d66358f20ad7b057466aa is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below b205ff58e02922ac324f931cf9eb238a3acdb048 is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 5a999b5a16530898f0dbe5f8c50fd45ea72e110b is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 1008e9e0b8280d47f1ab5e9c113f666a023a9697 is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 64993d970dde2a2da353e9e99595a4fa88ec27d9 is affected.
- Version 80765597bc587feae8dbc8ce97a0f32e12a6e625 and below 5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46 is affected.
- Version 4.17 is affected.
- Before 4.17 is unaffected.
- Version 5.10.273, <= 5.10.* is unaffected.
- Version 5.15.224, <= 5.15.* is unaffected.
- Version 6.1.191, <= 6.1.* is unaffected.
- Version 6.6.161, <= 6.6.* is unaffected.
- Version 6.12.115, <= 6.12.* is unaffected.
- Version 6.18.60, <= 6.18.* is unaffected.
- Version 7.2.14, <= 7.2.* is unaffected.
- Version 7.3.1, <= 7.3.* is unaffected.