CVE-2026-43321: bpf: Properly mark live registers for indirect jumps

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-08 · updated 2026-10-19
Weakness: CWE-682

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Properly mark live registers for indirect jumps For a `gotox rX` instruction the rX register should be marked as used in the compute_insn_live_regs() function. Fix this.

Affected products

Linux kernel: from 6.19 before 6.19.6; 7.0-rc1, 7.0-rc2, 7.0-rc3, 7.0-rc4, 7.0-rc5, 7.0-rc6 (+1) — fixed in 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 6.19.6. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/7beae54111c34ca63357ef120e115889b915beb5
https://git.kernel.org/stable/c/d1aab1ca576c90192ba961094d51b0be6355a4d6

Get alerted when CVE-2026-43321 or the next vulnerability affects your stack