CVE-2022-49561: linux kernel — Fix

Description

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.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.7 — 4.14.282
linux	linux_kernel	4.15 — 4.19.246
linux	linux_kernel	4.20 — 5.4.197
linux	linux_kernel	5.5 — 5.10.120
linux	linux_kernel	5.11 — 5.15.45
linux	linux_kernel	5.16 — 5.17.13
linux	linux_kernel	5.18 — 5.18.2

References

Advisories & Patches

https://git.kernel.org/stable/c/01989d7eebb61c99bd4b88ebc8e261bd2f02caed https://git.kernel.org/stable/c/04e4a11dc723c52db7a36dc58f0d69ce6426f8f0 https://git.kernel.org/stable/c/04f9e9104c969d8ce10a4a43634f641ed082092d https://git.kernel.org/stable/c/56b14ecec97f39118bf85c9ac2438c5a949509ed https://git.kernel.org/stable/c/91a36ec160ec1a0c8f5352b772dffcbb0b6023e3 https://git.kernel.org/stable/c/92a999d1963eed0df666284e20055136ceabd12f https://git.kernel.org/stable/c/b16bb373988da3ceb0308381634117e18b6ec60d https://git.kernel.org/stable/c/e97222b785e70e8973281666d709baad6523d8af

Frequently Asked Questions

What is CVE-2022-49561? +

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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49561? +

CVE-2022-49561 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2022-49561? +

CVE-2022-49561 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49561? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2022-49561