CVE-2022-49957: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: kcm: fix strp_init() order and cleanup strp_init() is called just a few lines above this csk->sk_user_data check, it also initializes strp->work etc., therefore, it is unnecessary to call strp_done() to cancel the freshly initialized work. And if sk_user_data is already used by KCM, psock->strp should not be touched, particularly strp->work state, so we need to move strp_init() after the csk->sk_user_data check. This also makes a lockdep warning reported by syzbot go away.

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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

Weakness Type (CWE)

CWE-908 CWE-908

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.9.84 — 4.10
linux	linux_kernel	4.9.100 — 4.10
linux	linux_kernel	4.14.22 — 4.14.293
linux	linux_kernel	4.14.41 — 4.15
linux	linux_kernel	4.15.1 — 4.19.258
linux	linux_kernel	4.20 — 5.4.213
linux	linux_kernel	5.5 — 5.10.142
linux	linux_kernel	5.11 — 5.15.66
linux	linux_kernel	5.16 — 5.19.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/0946ff31d1a8778787bf6708beb20f38715267cc https://git.kernel.org/stable/c/1b6666964ca1de93a7bf06e122bcf3616dbd33a9 https://git.kernel.org/stable/c/473f394953216614087f4179e55cdf0cf616a13b https://git.kernel.org/stable/c/55fb8c3baa8071c5d533a9ad48624e44e2a04ef5 https://git.kernel.org/stable/c/8fc29ff3910f3af08a7c40a75d436b5720efe2bf https://git.kernel.org/stable/c/a8a0c321319ad64a5427d6172cd9c23b4d6ca1e8 https://git.kernel.org/stable/c/f865976baa85915c7672f351b74d5974b93215f6

Frequently Asked Questions

What is CVE-2022-49957? +

In the Linux kernel, the following vulnerability has been resolved: kcm: fix strp_init() order and cleanup strp_init() is called just a few lines above this csk->sk_user_data check, it also initializes strp->work etc., therefore, it is unnecessary to call strp_done() to cancel the freshly initialized work. And if sk_user_data is already used by KCM, psock->strp should not be touched, particularly strp->work state, so we need to move strp_init() after the csk->sk_user_data check. This also makes a lockdep warning reported by syzbot go away. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49957? +

CVE-2022-49957 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-2022-49957? +

CVE-2022-49957 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-2022-49957? +

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-2022-49957