CVE-2026-90177
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In the Linux kernel BPF verifier, the pointer type for atomic RMW operations is recorded only when the current destination is PTR_TO_ARENA. A second path can reach the same instruction with an ordinary pointer without comparing it against the saved arena type, leading to incompatible use of the instruction.
Risk Assessment
This may allow bypassing BPF verification and executing unsafe operations, potentially leading to privilege escalation or kernel instability. The risk affects systems using BPF programs.
Recommendation
Update the kernel to a version containing the fix that records the actual destination type for all atomic RMW paths. Until then, restrict loading of untrusted BPF programs.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: bpf: Check pointer type for all atomic RMW paths Atomic RMW verification records an instruction pointer type only when the current destination is PTR_TO_ARENA. A second path can therefore reach the same instruction with an ordinary pointer without comparing it against the saved arena type. The post-verification fixup uses the saved type to rewrite the instruction to BPF_PROBE_ATOMIC for every path. Record the actual destination type for all atomic RMW paths so the existing mismatch check rejects incompatible uses of one instruction.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS