CVE-2026-98816 bpf: Fix overflow of jump offset in constant blinding
A local attacker with BPF privileges can trigger a kernel crash via integer overflow in BPF constant blinding when hardening is enabled.
- 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-2026-98816?
CVE-2026-98816 is a vulnerability in Linux, published on 18 Oct 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: Fix overflow of jump offset in constant blinding
bpf_jit_blind_insn() rewrites 'if rX op imm goto off' into:
AX = imm ^ rnd AX ^= rnd if rX op AX goto off
and subtracts 2 from off when the jump is backward. off is s16, so -32767 and -32768 wrap and the jump goes 32767 insns forward, past the end of the prog. The jump is inside the patch, hence bpf_adj_branches() doesn't check it. The kernel crashes when such prog runs with bpf_jit_harden=2.
Return -ERANGE in such case. bpf_jit_blind_constants() fails the same way when blinding of other insns moves a jump out of range.
Which versions are affected by CVE-2026-98816?
How do I fix CVE-2026-98816?
Apply the vendor's patch.
Is CVE-2026-98816 being exploited?
There is no known exploitation of CVE-2026-98816 in the wild and no public exploit code.
Sources
Also known as AZL-109149, BELL-CVE-2026-98816, DEBIAN-CVE-2026-98816, GHSA-6x96-v5fq-fjjw, UBUNTU-CVE-2026-98816.