CVE-2026-90177

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.

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