linux-cve-announce - CVE-2025-38435: riscv: vector: Fix context save/restore with xtheadvector

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Message-ID: <2025072512-CVE-2025-38435-ffc0@gregkh>
Date: Fri, 25 Jul 2025 16:32:14 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38435: riscv: vector: Fix context save/restore with xtheadvector

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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

riscv: vector: Fix context save/restore with xtheadvector

Previously only v0-v7 were correctly saved/restored,
and the context of v8-v31 are damanged.
Correctly save/restore v8-v31 to avoid breaking userspace.

The Linux kernel CVE team has assigned CVE-2025-38435 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.14 with commit d863910eabaffc68eb28aaf476dd870fc3f7197d and fixed in 6.15.5 with commit dd5ceea8d50e9e108a10d1e0d89fa2c9ff442ca2
	Issue introduced in 6.14 with commit d863910eabaffc68eb28aaf476dd870fc3f7197d and fixed in 6.16-rc4 with commit 4262bd0d9cc704ea1365ac00afc1272400c2cbef

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2025-38435
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	arch/riscv/include/asm/vector.h


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/dd5ceea8d50e9e108a10d1e0d89fa2c9ff442ca2
	https://git.kernel.org/stable/c/4262bd0d9cc704ea1365ac00afc1272400c2cbef