CVE-2022-49359: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: drm/panfrost: Job should reference MMU not file_priv For a while now it's been allowed for a MMU context to outlive it's corresponding panfrost_priv, however the job structure still references panfrost_priv to get hold of the MMU context. If panfrost_priv has been freed this is a use-after-free which I've been able to trigger resulting in a splat. To fix this, drop the reference to panfrost_priv in the job structure and add a direct reference to the MMU structure which is what's actually needed.

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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	5.10.67 — 5.11
linux	linux_kernel	5.13.19 — 5.14
linux	linux_kernel	5.14.6 — 5.17.15
linux	linux_kernel	5.18 — 5.18.4
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/472dd7ea5e19a1aeabf1711ddc756777e05ee7c2 https://git.kernel.org/stable/c/6e516faf04317db2c46cbec4e3b78b4653a5b109 https://git.kernel.org/stable/c/8c8e8cc91a6ffc79865108279a74fd57d9070a17

Frequently Asked Questions

What is CVE-2022-49359? +

In the Linux kernel, the following vulnerability has been resolved: drm/panfrost: Job should reference MMU not file_priv For a while now it's been allowed for a MMU context to outlive it's corresponding panfrost_priv, however the job structure still references panfrost_priv to get hold of the MMU context. If panfrost_priv has been freed this is a use-after-free which I've been able to trigger resulting in a splat. To fix this, drop the reference to panfrost_priv in the job structure and add a direct reference to the MMU structure which is what's actually needed. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-49359? +

CVE-2022-49359 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-2022-49359? +

CVE-2022-49359 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-2022-49359? +

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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