CVE-2022-49672: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: net: tun: unlink NAPI from device on destruction Syzbot found a race between tun file and device destruction. NAPIs live in struct tun_file which can get destroyed before the netdev so we have to del them explicitly. The current code is missing deleting the NAPI if the queue was detached first.

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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	4.15 — 4.19.251
linux	linux_kernel	4.20 — 5.4.204
linux	linux_kernel	5.5 — 5.10.129
linux	linux_kernel	5.11 — 5.15.53
linux	linux_kernel	5.16 — 5.18.10
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/3b9bc84d311104906d2b4995a9a02d7b7ddab2db https://git.kernel.org/stable/c/8145f77d38de4f88b8a69e1463f5c09ba189d77c https://git.kernel.org/stable/c/82e729aee59acefe135fceffadcbc5b86dd4f1b9 https://git.kernel.org/stable/c/8661d4b8faa2f7ee7a559969c0a7c57f077b1728 https://git.kernel.org/stable/c/a8cf919022373c97a84fe596bbea544f909c485d https://git.kernel.org/stable/c/bec1be0a745ab420718217e3e0d9542a75108989

Frequently Asked Questions

What is CVE-2022-49672? +

In the Linux kernel, the following vulnerability has been resolved: net: tun: unlink NAPI from device on destruction Syzbot found a race between tun file and device destruction. NAPIs live in struct tun_file which can get destroyed before the netdev so we have to del them explicitly. The current code is missing deleting the NAPI if the queue was detached first. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49672? +

CVE-2022-49672 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-2022-49672? +

CVE-2022-49672 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-2022-49672? +

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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