Description
In the Linux kernel, the following vulnerability has been resolved: tracing: Check operator stack capacity before pushing predicate_parse() uses the first operator stack entry before processing any opening parentheses. A push then increments top before writing. The existing check still permits that write when top already points to the last allocated entry, which can access beyond the operator stack. Reject the push when top reaches the last allocated entry.
References5
- git.kernel.org/stable/c/75e894f92417390f0ef44fd350f2d3634c784876
- git.kernel.org/stable/c/a866a8a753922cdf7710b8eb3f686dc0efc06505
- git.kernel.org/stable/c/c43c41ec62ca54ae145aa4912c6692a26d625734
- git.kernel.org/stable/c/c47a7b11bcb3d45e29723afcf6336866476b1d08
- git.kernel.org/stable/c/d6f0006f194db49c54117ae22146421da5a2ca59
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 3 November 2026
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.