Critical · published February 26, 2025
In the Linux kernel, the following vulnerability has been resolved:
netfilter: conntrack: re-fetch conntrack after insertion
In case the conntrack is clashing, insertion can free skb->_nfct and
set skb->_nfct to the already-confirmed entry.
This wasn't found before because the conntrack entry and the extension
space used to free'd after an rcu grace period, plus the race needs
events enabled to trigger.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.7, < 4.14.282 | 4.14.282 |
| linux/linux_kernel | ≥ 4.15, < 4.19.246 | 4.19.246 |
| linux/linux_kernel | ≥ 4.20, < 5.4.197 | 5.4.197 |
| linux/linux_kernel | ≥ 5.5, < 5.10.120 | 5.10.120 |
| linux/linux_kernel | ≥ 5.11, < 5.15.45 | 5.15.45 |
| linux/linux_kernel | ≥ 5.16, < 5.17.13 | 5.17.13 |
| linux/linux_kernel | ≥ 5.18, < 5.18.2 | 5.18.2 |