CVE-2022-50300: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix extent map use-after-free when handling missing device in read_one_chunk Store the error code before freeing the extent_map. Though it's reference counted structure, in that function it's the first and last allocation so this would lead to a potential use-after-free. The error can happen eg. when chunk is stored on a missing device and the degraded mount option is missing. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.15 — 5.15.87
linux	linux_kernel	5.16 — 6.0.18
linux	linux_kernel	6.1 — 6.1.4

References

Advisories & Patches

https://git.kernel.org/stable/c/169a4cf46882974d4db6d85eb623ec898e51bbc0 https://git.kernel.org/stable/c/1742e1c90c3da344f3bb9b1f1309b3f47482756a https://git.kernel.org/stable/c/b8e7ed42bc3ca0d0e4191ee394d34962d3624c22 https://git.kernel.org/stable/c/fce3713197ebba239e1c7e02174ed216ea1ee014

Frequently Asked Questions

What is CVE-2022-50300? +

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix extent map use-after-free when handling missing device in read_one_chunk Store the error code before freeing the extent_map. Though it's reference counted structure, in that function it's the first and last allocation so this would lead to a potential use-after-free. The error can happen eg. when chunk is stored on a missing device and the degraded mount option is missing. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=216721 It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50300? +

CVE-2022-50300 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-50300? +

CVE-2022-50300 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-2022-50300? +

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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