CVE-2026-98034

CVE CVE-2026-98034EUVD EUVD-2026-86687Published 2026-09-25T10:23:49.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: Mark NULL kptr stores precise check_map_kptr_access() permits a scalar store into an untrusted kptr field only when the register is known to contain zero. Unlike other verifier checks whose outcome depends on a scalar value, it does not mark that register precise. A state checkpoint reached with an imprecise zero can therefore prune a second path that reaches the store with an arbitrary nonzero scalar. The program can write attacker-controlled bits into the kptr field and load them back as a PTR_TO_BTF_ID. Call mark_chain_precision() before accepting a known-zero register. This forces state equivalence to compare its scalar range and makes the verifier visit and reject a path carrying a nonzero value.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 61df10c7799e27807ad5e459eec9d77cddf8bf45 <ecdc5043794c9184aa8e6c814603899479c46b35; patch: 7.3-rc2; b5a8069835e5236824a84281592d29f859b33153; 61df10c7799e27807ad5e459eec9d77cddf8bf45 <86168208737bdd267d92d855d453d1d2f840df19; patch: 0; patch: 7.2.7; 5.18.18 <5.19; 5.19

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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