powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas()
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.3%
exploitation probability
0.3%top 83% of all CVEs
observed exploitation
nono source reports it
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.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0974d03eb479384466d828d65637814bee6b26d7https://git.kernel.org/stable/c/1f1feff02e9da0dd0cdb195c428c42b5f9b6c771https://git.kernel.org/stable/c/68d8156480940b79227d58865ec5d2947b9384a8https://git.kernel.org/stable/c/a262c2dc833f2fe1bd5c53a4d899e7077d3b1da9https://git.kernel.org/stable/c/b137af795399d8b657bad1646c18561530f35ed1https://git.kernel.org/stable/c/d2834ff1d9641a8695a09ea79cd901c7b6d4d05fhttps://lists.debian.org/debian-lts-announce/2025/05/msg00045.html