Description

In the Linux kernel, the following vulnerability has been resolved:

powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()

Smatch warns:

arch/powerpc/kernel/rtas.c:1932 __do_sys_rtas() warn: potential
spectre issue 'args.args' [r] (local cap)

The 'nargs' and 'nret' locals come directly from a user-supplied
buffer and are used as indexes into a small stack-based array and as
inputs to copy_to_user() after they are subject to bounds checks.

Use array_index_nospec() after the bounds checks to clamp these values
for speculative execution.

Classification

CVE ID: CVE-2024-46774

CVSS Base Severity: HIGH

CVSS Base Score: 7.1

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

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.09% (probability of being exploited)

EPSS Percentile: 26.16% (scored less or equal to compared to others)

EPSS Date: 2025-05-24 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-46774
https://git.kernel.org/stable/c/b137af795399d8b657bad1646c18561530f35ed1
https://git.kernel.org/stable/c/1f1feff02e9da0dd0cdb195c428c42b5f9b6c771
https://git.kernel.org/stable/c/68d8156480940b79227d58865ec5d2947b9384a8
https://git.kernel.org/stable/c/0974d03eb479384466d828d65637814bee6b26d7

Timeline