CVE-2026-93043 bpf: Disallow interpreter fallback for gotox insn
A local attacker can trigger a kernel crash by loading a BPF program with a specific instruction that causes the interpreter to hit a BUG_ON assertion.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93043?
CVE-2026-93043 is a denial of service vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bpf: Disallow interpreter fallback for gotox insn
The interpreter does not recognize the BPF_JMP|BPF_JA|BPF_X insn, which is used for insn_array map. Thereafter, it would hit the BUG_ON() in ___bpf_prog_run() at run time.
[ 2.563726] BPF interpreter: unknown opcode 0d (imm: 0x0) [ 2.564557] ------------[ cut here ]------------ [ 2.565206] kernel BUG at kernel/bpf/core.c:2349! [ 2.565882] Oops: invalid opcode: 0000 [#1] SMP PTI
Set jit_required as true when insn_array map is used in the prog in order to disallow interpreter fallback for gotox insn in core.c::__bpf_prog_select_runtime().
Which versions are affected by CVE-2026-93043?
How do I fix CVE-2026-93043?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-93043 being exploited?
There is no known exploitation of CVE-2026-93043 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93043, GHSA-mx88-hh53-rq74, UBUNTU-CVE-2026-93043.