CVE-2024-50193: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: x86/entry_32: Clear CPU buffers after register restore in NMI return CPU buffers are currently cleared after call to exc_nmi, but before register state is restored. This may be okay for MDS mitigation but not for RDFS. Because RDFS mitigation requires CPU buffers to be cleared when registers don't have any sensitive data. Move CLEAR_CPU_BUFFERS after RESTORE_ALL_NMI.

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CVSS v3.1 Score

7.1

HIGH

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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 5.10.228
linux	linux_kernel	5.11 — 5.15.169
linux	linux_kernel	5.16 — 6.1.114
linux	linux_kernel	6.2 — 6.6.58
linux	linux_kernel	6.8 — 6.11.5
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/227358e89703c344008119be7e8ffa3fdb5b92de https://git.kernel.org/stable/c/43778de19d2ef129636815274644b9c16e78c66b https://git.kernel.org/stable/c/48a2440d0f20c826b884e04377ccc1e4696c84e9 https://git.kernel.org/stable/c/64adf22c4bc73ede920baca5defefb70f190cdbc https://git.kernel.org/stable/c/6f44a5fc15b5cece0785bc07453db77d99b0a6de https://git.kernel.org/stable/c/b6400eb0b347821efc57760221f8fb6d63b9548a

Other References

https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Frequently Asked Questions

What is CVE-2024-50193? +

In the Linux kernel, the following vulnerability has been resolved: x86/entry_32: Clear CPU buffers after register restore in NMI return CPU buffers are currently cleared after call to exc_nmi, but before register state is restored. This may be okay for MDS mitigation but not for RDFS. Because RDFS mitigation requires CPU buffers to be cleared when registers don't have any sensitive data. Move CLEAR_CPU_BUFFERS after RESTORE_ALL_NMI. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2024-50193? +

CVE-2024-50193 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-50193? +

CVE-2024-50193 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-2024-50193? +

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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CVE-2024-50193