CVE-2026-93044

Summary

In the Linux kernel, the following vulnerability has been resolved:

bpf: Disallow interpreter fallback for arena-related insns

Since the interpreter does not support the arena-related insns, interpreter fallback should not be allowed for these insns in core.c::__bpf_prog_select_runtime().

Currently, when the interpreter executes the arena ST/LDX/STX insns, it would hit the BUG_ON() in ___bpf_prog_run() at run time.

[ 2.579196] BPF interpreter: unknown opcode a2 (imm: 0x0) [ 2.579998] ————[ cut here ]———— [ 2.580652] kernel BUG at kernel/bpf/core.c:2349! [ 2.581314] Oops: invalid opcode: 0000 [#1] SMP PTI

Set jit_required as true when arena map is used in the prog to disallow interpreter fallback for arena-related insns.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6082b6c328b5486da2b356eae94b8b83c98b5565 < 408b6d3bc19c4aa852ab7ee2f447756e52e69967affected
LinuxLinux6082b6c328b5486da2b356eae94b8b83c98b5565 < 34746b5a84ec37c0ea2bf6808c65c5ed8790eb51affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References