CVE-2026-80636
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: revert ct extension genid infrastructure This infrastructure is not used anymore after moving ct timeout and helper to use datapath refcount to track object use. Revert commit c56716c69ce1 ("netfilter: extensions: introduce extension genid count") this patch disables all ct extensions (leading to NULL) for unconfirmed conntracks, when this is only targeted at ct helper and ct timeout. There is also codebase that dereferences the ct extension without checking for NULL which could lead to crash.
How to fix
- Linux Linux6bba4846f196d081bf553391d12b5a73dcc48685, 61eab1d0237eb513fe73e391a5926ee70092c325, d53eecbca16f056abba274075cb15120ab062518, a052a94bcc629acaecc2ce42a4af77f8fa399757, 35e21a4dccc5c255ba59ccfbfeb4629ed21da972 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | c56716c69ce1ac320432fb1ea5654196ba24d2f8 ≤ v < 6bba4846f196d081bf553391d12b5a73dcc48685, c56716c69ce1ac320432fb1ea5654196ba24d2f8 ≤ v < 61eab1d0237eb513fe73e391a5926ee70092c325, c56716c69ce1ac320432fb1ea5654196ba24d2f8 ≤ v < d53eecbca16f056abba274075cb15120ab062518, c56716c69ce1ac320432fb1ea5654196ba24d2f8 ≤ v < a052a94bcc629acaecc2ce42a4af77f8fa399757, c56716c69ce1ac320432fb1ea5654196ba24d2f8 ≤ v < 35e21a4dccc5c255ba59ccfbfeb4629ed21da972, 5.19 | 6bba4846f196d081bf553391d12b5a73dcc48685, 61eab1d0237eb513fe73e391a5926ee70092c325, d53eecbca16f056abba274075cb15120ab062518, a052a94bcc629acaecc2ce42a4af77f8fa399757, 35e21a4dccc5c255ba59ccfbfeb4629ed21da972 |
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