CVE-2023-52576: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer() The code calling ima_free_kexec_buffer() runs long after the memblock allocator has already been torn down, potentially resulting in a use after free in memblock_isolate_range(). With KASAN or KFENCE, this use after free will result in a BUG from the idle task, and a subsequent kernel panic. Switch ima_free_kexec_buffer() over to memblock_free_late() to avoid that bug.

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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-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.13 — 6.1.56
linux	linux_kernel	6.2 — 6.5.6
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/34cf99c250d5cd2530b93a57b0de31d3aaf8685b https://git.kernel.org/stable/c/d2dfbc0e3b7a04c2d941421a958dc31c897fb204 https://git.kernel.org/stable/c/eef16bfdb212da60f5144689f2967fb25b051a2b https://git.kernel.org/stable/c/34cf99c250d5cd2530b93a57b0de31d3aaf8685b https://git.kernel.org/stable/c/d2dfbc0e3b7a04c2d941421a958dc31c897fb204 https://git.kernel.org/stable/c/eef16bfdb212da60f5144689f2967fb25b051a2b

Frequently Asked Questions

What is CVE-2023-52576? +

In the Linux kernel, the following vulnerability has been resolved: x86/mm, kexec, ima: Use memblock_free_late() from ima_free_kexec_buffer() The code calling ima_free_kexec_buffer() runs long after the memblock allocator has already been torn down, potentially resulting in a use after free in memblock_isolate_range(). With KASAN or KFENCE, this use after free will result in a BUG from the idle task, and a subsequent kernel panic. Switch ima_free_kexec_buffer() over to memblock_free_late() to avoid that bug. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-52576? +

CVE-2023-52576 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-2023-52576? +

CVE-2023-52576 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-2023-52576? +

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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