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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-98034

bpf: Mark NULL kptr stores precise

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Status
Published
Published
Updated
Assigning organization
Linux

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 61df10c7799e27807ad5e459eec9d77cddf8bf45 to < 86a3171c90bfc35a54e9d83cd197ca0d72d2f4e4affected
  • 61df10c7799e27807ad5e459eec9d77cddf8bf45 to < b8b98d3d37908402ff63515fa4d7574235436ea8affected
  • 61df10c7799e27807ad5e459eec9d77cddf8bf45 to < bb667eb575c906f24c707986541a99424c5b07eaaffected
  • 61df10c7799e27807ad5e459eec9d77cddf8bf45 to < 86168208737bdd267d92d855d453d1d2f840df19affected
  • 61df10c7799e27807ad5e459eec9d77cddf8bf45 to < ecdc5043794c9184aa8e6c814603899479c46b35affected
  • b5a8069835e5236824a84281592d29f859b33153affected
  • 5.18.18 to < 5.19affected

Linux Linux

Default version status: affected

  • 5.19affected
  • 0 to < 5.19unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.2.7 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References