CVE-2026-92518 riscv, bpf: Fix kernel stack corruption in tailcall with CFI
Kernel stack corruption in RISC-V BPF tailcalls with CFI enabled allows attackers to execute arbitrary code or escalate privileges.
- 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-2026-92518?
CVE-2026-92518 is a high-severity memory corruption 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:
riscv, bpf: Fix kernel stack corruption in tailcall with CFI
When CONFIG_CFI_CLANG is enabled, prog->bpf_func already skips the kcfi instruction during setup. Including it again in the tailcall jump offset causes it to jump over an extra 4 bytes, skipping the stack pointer adjustment, which will result in kernel stack corruption.
Which versions are affected by CVE-2026-92518?
How do I fix CVE-2026-92518?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-92518 being exploited?
There is no known exploitation of CVE-2026-92518 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-92518, DEBIAN-CVE-2026-92518, GHSA-63c9-g3g8-7rpv, UBUNTU-CVE-2026-92518.