CVE-2022-49561

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < e97222b785e70e8973281666d709baad6523d8afaffected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < 92a999d1963eed0df666284e20055136ceabd12faffected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < b16bb373988da3ceb0308381634117e18b6ec60daffected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < 91a36ec160ec1a0c8f5352b772dffcbb0b6023e3affected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < 01989d7eebb61c99bd4b88ebc8e261bd2f02caedaffected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < 04f9e9104c969d8ce10a4a43634f641ed082092daffected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < 04e4a11dc723c52db7a36dc58f0d69ce6426f8f0affected
LinuxLinux71d8c47fc653711c41bc3282e5b0e605b3727956 < 56b14ecec97f39118bf85c9ac2438c5a949509edaffected
LinuxLinux4.7affected
LinuxLinux0 < 4.7unaffected
LinuxLinux4.14.282 <= 4.14.*unaffected
LinuxLinux4.19.246 <= 4.19.*unaffected
LinuxLinux5.4.197 <= 5.4.*unaffected
LinuxLinux5.10.120 <= 5.10.*unaffected
LinuxLinux5.15.45 <= 5.15.*unaffected
LinuxLinux5.17.13 <= 5.17.*unaffected
LinuxLinux5.18.2 <= 5.18.*unaffected
LinuxLinux5.19 <= *unaffected

Weaknesses

References