CVE-2026-43030 bpf: Fix regsafe() for pointers to packet
A logic error in the Linux kernel BPF verifier may cause valid packet range states to be skipped during verification.
- 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-2026-43030?
CVE-2026-43030 is a high-severity vulnerability in Linux kernel, published on 1 May 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 regsafe() for pointers to packet
In case rold->reg->range == BEYOND_PKT_END && rcur->reg->range == N regsafe() may return true which may lead to current state with valid packet range not being explored. Fix the bug.
Weakness: CWE-682
Which versions are affected by CVE-2026-43030?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-43030?
Apply the vendor's patch.
Is CVE-2026-43030 being exploited?
There is no known exploitation of CVE-2026-43030 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-43030, DEBIAN-CVE-2026-43030, GHSA-pw9r-hr33-fhf6, ROOT-OS-DEBIAN-11-CVE-2026-43030, ROOT-OS-UBUNTU-2204-CVE-2026-43030, ROOT-OS-UBUNTU-2404-CVE-2026-43030 and 1 more.