CVE-2026-99236
In the Linux kernel, the following vulnerability has been resolved: tracing: Reject incomplete event filter expressions A non-empty expression normally finishe…
Impact
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.
An attacker can exploit this with local access to the system, with a regular user account, without any action by a user. If it succeeds: high risk of data being read, high risk of data or systems being changed, high risk of outages.
Affected products · Linux
| Product | Affected versions |
|---|---|
| Linux | from 80765597bc587feae8dbc8ce97a0f32e12a6e625 before 4a1a6d35359991c5d47f4bf101cfbe1475c94093 from 80765597bc587feae8dbc8ce97a0f32e12a6e625 before 2a98f5d4913ec081e08e1075512cb7ec313d9f72 from 80765597bc587feae8dbc8ce97a0f32e12a6e625 before 15ff3cc7f2beecc3f95d66358f20ad7b057466aa from 80765597bc587feae8dbc8ce97a0f32e12a6e625 before b205ff58e02922ac324f931cf9eb238a3acdb048 from 80765597bc587feae8dbc8ce97a0f32e12a6e625 before 5a999b5a16530898f0dbe5f8c50fd45ea72e110b from 80765597bc587feae8dbc8ce97a0f32e12a6e625 before 1008e9e0b8280d47f1ab5e9c113f666a023a9697 |
References
- NVD record
- CVE.org record
- GitHub advisory
- https://git.kernel.org/stable/c/4a1a6d35359991c5d47f4bf101cfbe1475c94093
- https://git.kernel.org/stable/c/2a98f5d4913ec081e08e1075512cb7ec313d9f72
- https://git.kernel.org/stable/c/15ff3cc7f2beecc3f95d66358f20ad7b057466aa
- https://git.kernel.org/stable/c/b205ff58e02922ac324f931cf9eb238a3acdb048
- https://git.kernel.org/stable/c/5a999b5a16530898f0dbe5f8c50fd45ea72e110b
- https://git.kernel.org/stable/c/1008e9e0b8280d47f1ab5e9c113f666a023a9697
- https://git.kernel.org/stable/c/64993d970dde2a2da353e9e99595a4fa88ec27d9
- https://git.kernel.org/stable/c/5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46
- https://github.com/advisories/GHSA-45x7-jj5h-2j9x
- https://nvd.nist.gov/vuln/detail/CVE-2026-99236
- https://git.kernel.org/stable/c/1fdc4164e488916402badddbb1f51e9380dabb91