CVE-2026-45850 ipvs: skip ipv6 extension headers for csum checks
Attackers can cause denial of service in Linux kernel IPVS by sending IPv6 packets with extension headers that trigger checksum validation failures.
- 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-2026-45850?
CVE-2026-45850 is a medium-severity denial of service vulnerability in Linux kernel, published on 27 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:
ipvs: skip ipv6 extension headers for csum checks
Protocol checksum validation fails for IPv6 if there are extension headers before the protocol header. iph->len already contains its offset, so use it to fix the problem.
Which versions are affected by CVE-2026-45850?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45850?
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-2026-45850 being exploited?
There is no known exploitation of CVE-2026-45850 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88443, BELL-CVE-2026-45850, DEBIAN-CVE-2026-45850, GHSA-3j9q-258h-4v38, ROOT-OS-DEBIAN-11-CVE-2026-45850, ROOT-OS-DEBIAN-12-CVE-2026-45850 and 4 more.