bpf: Mark NULL kptr stores precise

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98034
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:32 UTC
Updated2026-09-25 11:17:32 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 61df10c7799e27807ad5e459eec9d77cddf8bf45 86168208737bdd267d92d855d453d1d2f840df19 git Not specified
CNA Linux Linux affected 61df10c7799e27807ad5e459eec9d77cddf8bf45 ecdc5043794c9184aa8e6c814603899479c46b35 git Not specified
CNA Linux Linux affected b5a8069835e5236824a84281592d29f859b33153 git Not specified
CNA Linux Linux affected 5.18.18 5.19 semver Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ecdc5043794c9184aa8e6c814603899479c46b35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/86168208737bdd267d92d855d453d1d2f840df19 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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