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CVE-2026-90177: bpf: Check pointer type for all atomic RMW paths

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-21

Description

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.

Affected products

• Linux kernel: 6.10 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4bc49ae344d65cfcef738f281ac575cf73ca2fc5
• https://git.kernel.org/stable/c/b14dabe9656c1029abf3aa01e69c0d62f37f2f88
• https://git.kernel.org/stable/c/d4ba9d888ac0a8f12c78071fff73e1205a0b9293
• https://git.kernel.org/stable/c/eb287c6e81dedef92da01eb947f380d0aae513c3

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