CVE-2023-53636: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: clk: microchip: fix potential UAF in auxdev release callback Similar to commit 1c11289b34ab ("peci: cpu: Fix use-after-free in adev_release()"), the auxiliary device is not torn down in the correct order. If auxiliary_device_add() fails, the release callback will be called twice, resulting in a UAF. Due to timing, the auxdev code in this driver "took inspiration" from the aforementioned commit, and thus its bugs too! Moving auxiliary_device_uninit() to the unregister callback instead avoids the issue.

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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	6.1 — 6.1.28
linux	linux_kernel	6.2 — 6.2.15
linux	linux_kernel	6.3 — 6.3.2

References

Advisories & Patches

https://git.kernel.org/stable/c/5b4052aa956e11bcd19e50ca559eb38dcb46201b https://git.kernel.org/stable/c/7455b7007b9e93bcc2bc9c1c6c73a228e3152069 https://git.kernel.org/stable/c/934406b2d42eaf3fc57f5546cc68ff7ab9680bb3 https://git.kernel.org/stable/c/d7d6dacf39ed102d7667721ca1700022c9c8b11a

Frequently Asked Questions

What is CVE-2023-53636? +

In the Linux kernel, the following vulnerability has been resolved: clk: microchip: fix potential UAF in auxdev release callback Similar to commit 1c11289b34ab ("peci: cpu: Fix use-after-free in adev_release()"), the auxiliary device is not torn down in the correct order. If auxiliary_device_add() fails, the release callback will be called twice, resulting in a UAF. Due to timing, the auxdev code in this driver "took inspiration" from the aforementioned commit, and thus its bugs too! Moving auxiliary_device_uninit() to the unregister callback instead avoids the issue. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53636? +

CVE-2023-53636 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-2023-53636? +

CVE-2023-53636 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-2023-53636? +

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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