CVE-2026-64051: accel/qaic: Add overflow check to remap_pfn_range during mmap

CVE-2026-64051: accel/qaic: Add overflow check to remap_pfn_range during mmap

[Greg Kroah-Hartman]

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

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

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

accel/qaic: Add overflow check to remap_pfn_range during mmap

The call to remap_pfn_range in qaic_gem_object_mmap is susceptible to
(re)mapping beyond the VMA if the BO is too large. This can cause use
after free issues when munmap() unmaps only the VMA region and not the
additional mappings. To prevent this, check the remaining size of the
VMA before remapping and truncate the remapped length if sg->length is
too large.

[jhugo: fix braces from checkpatch --strict]

The Linux kernel CVE team has assigned CVE-2026-64051 to this issue.


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

	Issue introduced in 6.4 with commit ff13be8303336ead5621712f2c55012d738878b5 and fixed in 6.6.142 with commit 9baafc2fea096279e75480f93fd5942e8336b510
	Issue introduced in 6.4 with commit ff13be8303336ead5621712f2c55012d738878b5 and fixed in 6.12.92 with commit 8dd6edbe26770df147136c3f2ac976c873b82650
	Issue introduced in 6.4 with commit ff13be8303336ead5621712f2c55012d738878b5 and fixed in 6.18.34 with commit 97a8e89cdef36207a8776edc03d6931763a06ad0
	Issue introduced in 6.4 with commit ff13be8303336ead5621712f2c55012d738878b5 and fixed in 7.0.11 with commit 8c795012d0e06b7740e40319b86ff8d2a435098d
	Issue introduced in 6.4 with commit ff13be8303336ead5621712f2c55012d738878b5 and fixed in 7.1 with commit aa16b2bc0f02709919e2435f531406531e5bcc69

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-2026-64051
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/accel/qaic/qaic_data.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/9baafc2fea096279e75480f93fd5942e8336b510
	https://git.kernel.org/stable/c/8dd6edbe26770df147136c3f2ac976c873b82650
	https://git.kernel.org/stable/c/97a8e89cdef36207a8776edc03d6931763a06ad0
	https://git.kernel.org/stable/c/8c795012d0e06b7740e40319b86ff8d2a435098d
	https://git.kernel.org/stable/c/aa16b2bc0f02709919e2435f531406531e5bcc69