CVE-2026-93044 PUBLISHED

bpf: Disallow interpreter fallback for arena-related insns

Assigner: Linux
Reserved: 17.09.2026 Published: 17.09.2026 Updated: 17.09.2026

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.

Product Status

Vendor Linux
Product Linux
Versions Default: unaffected
  • affected from 6082b6c328b5486da2b356eae94b8b83c98b5565 to 408b6d3bc19c4aa852ab7ee2f447756e52e69967 (excl.)
  • affected from 6082b6c328b5486da2b356eae94b8b83c98b5565 to 34746b5a84ec37c0ea2bf6808c65c5ed8790eb51 (excl.)
Vendor Linux
Product Linux
Versions Default: affected
  • Version 6.9 is affected
  • unaffected from 0 to 6.9 (excl.)
  • unaffected from 7.2.6 to 7.2.* (incl.)
  • unaffected from 7.3-rc1 to * (incl.)

References