CVE-2022-50764 ipv6/sit: use DEV_STATS_INC() to avoid data-races
A race condition in the Linux kernel's IPv6 SIT tunnel driver can cause concurrent updates to error statistics, potentially leading to system instability or denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-50764?
CVE-2022-50764 is a vulnerability in Linux, published on 24 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ipv6/sit: use DEV_STATS_INC() to avoid data-races
syzbot/KCSAN reported that multiple cpus are updating dev->stats.tx_error concurrently.
This is because sit tunnels are NETIF_F_LLTX, meaning their ndo_start_xmit() is not protected by a spinlock.
While original KCSAN report was about tx path, rx path has the same issue.
Which versions are affected by CVE-2022-50764?
How do I fix CVE-2022-50764?
Apply the vendor's patch.
Is CVE-2022-50764 being exploited?
There is no known exploitation of CVE-2022-50764 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2022-50764, GHSA-grmr-47cc-4gc2, ROOT-OS-DEBIAN-11-CVE-2022-50764, UBUNTU-CVE-2022-50764.