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CVE-2026-98034

UnknownEPSS 0.17%

Last modified

CVE-2026-98034 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability
0.17%

5.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 61df10c7799e27807ad5e459eec9d77cddf8bf45, < 86a3171c90bfc35a54e9d83cd197ca0d72d2f4e4; >= 61df10c7799e27807ad5e459eec9d77cddf8bf45, < b8b98d3d37908402ff63515fa4d7574235436ea8; >= 61df10c7799e27807ad5e459eec9d77cddf8bf45, < bb667eb575c906f24c707986541a99424c5b07ea; >= 61df10c7799e27807ad5e459eec9d77cddf8bf45, < 86168208737bdd267d92d855d453d1d2f840df19; >= 61df10c7799e27807ad5e459eec9d77cddf8bf45, < ecdc5043794c9184aa8e6c814603899479c46b35; b5a8069835e5236824a84281592d29f859b33153; >= 5.18.18, < 5.19
LinuxLinux5.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98034?
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.
How severe is CVE-2026-98034?
Severity scoring for CVE-2026-98034 is pending analysis. The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-98034?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST