CVE-2026-99236

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    CVE-2026-99236

    Published: 2 Nov 2026Last Modified: 5 Nov 2026

    Summary: tracing: Reject incomplete event filter expressions

    Details: 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.

    References: https://git.kernel.org/stable/c/1008e9e0b8280d47f1ab5e9c113f666a023a9697, https://git.kernel.org/stable/c/15ff3cc7f2beecc3f95d66358f20ad7b057466aa, https://git.kernel.org/stable/c/1fdc4164e488916402badddbb1f51e9380dabb91, https://git.kernel.org/stable/c/2a98f5d4913ec081e08e1075512cb7ec313d9f72, https://git.kernel.org/stable/c/4a1a6d35359991c5d47f4bf101cfbe1475c94093, https://git.kernel.org/stable/c/5a999b5a16530898f0dbe5f8c50fd45ea72e110b, https://git.kernel.org/stable/c/5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46, https://git.kernel.org/stable/c/64993d970dde2a2da353e9e99595a4fa88ec27d9, https://git.kernel.org/stable/c/b205ff58e02922ac324f931cf9eb238a3acdb048, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99236.json, https://nvd.nist.gov/vuln/detail/CVE-2026-99236, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 80765597bc587feae8dbc8ce97a0f32e12a6e625
    Fixed -4a1a6d35359991c5d47f4bf101cfbe1475c94093

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-99236 | CVE-DB