In the Linux kernel, the following vulnerability has been resolved: tracing: Reject incomplete event filter expressions A non-empty…
CVE-2026-99236
In the Linux kernel, the following vulnerability has been resolved: tracing: Reject incomplete event filter expressions A non-empty expression normally finishes in predicateparse()'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, "commonpid == 1 || commonpid == 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 PERFEVENTIOCSETFILTER. 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.
Assessment
- CVSS
- 7.8 (v3.1)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 2 November 2026
- Last updated
- 2 November 2026
- Assigner
- Linux
CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
At the source
References
- 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://nvd.nist.gov/vuln/detail/CVE-2026-99236
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