Linux Kernel IPv6 SIT Tunnel Stats Data Race
CVE-2022-50764 Published on December 24, 2025
ipv6/sit: use DEV_STATS_INC() to avoid data-races
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.
Products Associated with CVE-2022-50764
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Affected Versions
Linux:- Version 8df40d1033d64597dcf1efd4f7547e817f7a953b and below 222cc04356984f3f98acfa756a69d4bed7c501ac is affected.
- Version 8df40d1033d64597dcf1efd4f7547e817f7a953b and below 4eed93bb3e57b8cc78d17166a14e40a73276015a is affected.
- Version 8df40d1033d64597dcf1efd4f7547e817f7a953b and below 207501a986831174df09a36a8cb62a28f92f0dc8 is affected.
- Version 8df40d1033d64597dcf1efd4f7547e817f7a953b and below cb34b7cf17ecf33499c9298943f85af247abc1e9 is affected.
- Version 2.6.37 is affected.
- Before 2.6.37 is unaffected.
- Version 5.15.86, <= 5.15.* is unaffected.
- Version 6.0.16, <= 6.0.* is unaffected.
- Version 6.1.2, <= 6.1.* is unaffected.
- Version 6.2, <= * is unaffected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.