What’s Vulnerable › Vulnerabilities

CVE-2024-50193: x86/entry_32: Clear CPU buffers after register restore in NMI return

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-11-08 · updated 2026-06-17

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.

Affected products

• Linux kernel: before 5.10.228; from 5.11 before 5.15.169; from 5.16 before 6.1.114; from 6.2 before 6.6.58; from 6.8 before 6.11.5; 6.12-rc1, 6.12-rc2, 6.12-rc3 — fixed in 5.10.228, 5.15.169, 6.1.114, 6.11.5, 6.6.58

How to fix

Upgrade to a fixed version: Linux kernel 5.10.228, 5.15.169, 6.1.114, 6.11.5. Check the vendor advisory for mitigations.

References

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

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