From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-cve-announce@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@kernel.org>
Subject: CVE-2026-43400: drm/amdgpu: add upper bound check on user inputs in signal ioctl
Date: Fri, 8 May 2026 16:22:09 +0200 [thread overview]
Message-ID: <2026050839-CVE-2026-43400-3a71@gregkh> (raw)
From: Greg Kroah-Hartman <gregkh@kernel.org>
Description
===========
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: add upper bound check on user inputs in signal ioctl
Huge input values in amdgpu_userq_signal_ioctl can lead to a OOM and
could be exploited.
So check these input value against AMDGPU_USERQ_MAX_HANDLES
which is big enough value for genuine use cases and could
potentially avoid OOM.
(cherry picked from commit be267e15f99bc97cbe202cd556717797cdcf79a5)
The Linux kernel CVE team has assigned CVE-2026-43400 to this issue.
Affected and fixed versions
===========================
Fixed in 6.18.19 with commit 6fff5204d8aa26b1be50b6427f833bd3e8899c4f
Fixed in 6.19.9 with commit 46630d966b99b0fc6cb01fef4110587f3375a0c0
Fixed in 7.0 with commit ea78f8c68f4f6211c557df49174c54d167821962
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-2026-43400
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:
drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.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/6fff5204d8aa26b1be50b6427f833bd3e8899c4f
https://git.kernel.org/stable/c/46630d966b99b0fc6cb01fef4110587f3375a0c0
https://git.kernel.org/stable/c/ea78f8c68f4f6211c557df49174c54d167821962
reply other threads:[~2026-05-08 14:24 UTC|newest]
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