linux-cve-announce - CVE-2025-71203: riscv: Sanitize syscall table indexing under speculation

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Message-ID: <2026021423-CVE-2025-71203-a81c@gregkh>
Date: Sat, 14 Feb 2026 17:28:24 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-71203: riscv: Sanitize syscall table indexing under speculation

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

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

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

riscv: Sanitize syscall table indexing under speculation

The syscall number is a user-controlled value used to index into the
syscall table. Use array_index_nospec() to clamp this value after the
bounds check to prevent speculative out-of-bounds access and subsequent
data leakage via cache side channels.

The Linux kernel CVE team has assigned CVE-2025-71203 to this issue.


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

	Fixed in 6.12.70 with commit c45848936ebdb4fcab92f8c39510db83c16d0239
	Fixed in 6.18.10 with commit 8b44e753795107a22ba31495686e83f4aca48f36
	Fixed in 6.19 with commit 25fd7ee7bf58ac3ec7be3c9f82ceff153451946c

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-2025-71203
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/kernel/traps.c


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/c45848936ebdb4fcab92f8c39510db83c16d0239
	https://git.kernel.org/stable/c/8b44e753795107a22ba31495686e83f4aca48f36
	https://git.kernel.org/stable/c/25fd7ee7bf58ac3ec7be3c9f82ceff153451946c