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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.1 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.21% probability · 12th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/227358e89703c344008119be7e8ffa3fdb5b92dePatch
- https://git.kernel.org/stable/c/43778de19d2ef129636815274644b9c16e78c66bPatch
- https://git.kernel.org/stable/c/48a2440d0f20c826b884e04377ccc1e4696c84e9Patch
- https://git.kernel.org/stable/c/64adf22c4bc73ede920baca5defefb70f190cdbcPatch
- https://git.kernel.org/stable/c/6f44a5fc15b5cece0785bc07453db77d99b0a6dePatch
- https://git.kernel.org/stable/c/b6400eb0b347821efc57760221f8fb6d63b9548aPatch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.