CVE-2026-53045: memory: tegra124-emc: Fix dll_change check

CVE-2026-53045: memory: tegra124-emc: Fix dll_change check

[Greg Kroah-Hartman]

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

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

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

memory: tegra124-emc: Fix dll_change check

The code checking whether the specified memory timing enables DLL
in the EMRS register was reversed. DLL is enabled if bit A0 is low.
Fix the check.

The Linux kernel CVE team has assigned CVE-2026-53045 to this issue.


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

	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 5.10.258 with commit a85967331144fde9300be38bb44d2558eb6b742e
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 5.15.209 with commit db0ae80865b515cc0b705c85877ec00f7eebe9fe
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 6.1.175 with commit 2369b1831161356e1bcb51385d3e532dc4fe2771
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 6.6.141 with commit 7e19e72f306484996c52ff96cc92f69b78ed5435
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 6.12.91 with commit 05f138fc7e27ee8e7a83ccf966c3fa26cda44dda
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 6.18.33 with commit 1793249c067a4b28e1aba0ad0e4d73aa9f9e165a
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 7.0.10 with commit 1ebbbef47d11cc90219c081492ccf995aaa3e9b3
	Issue introduced in 4.2 with commit 73a7f0a90641b09300d47308682b674c570dd6a2 and fixed in 7.1 with commit 9597ab9a8296ab337e6820f8a717ff621078b632

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-2026-53045
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/memory/tegra/tegra124-emc.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/a85967331144fde9300be38bb44d2558eb6b742e
	https://git.kernel.org/stable/c/db0ae80865b515cc0b705c85877ec00f7eebe9fe
	https://git.kernel.org/stable/c/2369b1831161356e1bcb51385d3e532dc4fe2771
	https://git.kernel.org/stable/c/7e19e72f306484996c52ff96cc92f69b78ed5435
	https://git.kernel.org/stable/c/05f138fc7e27ee8e7a83ccf966c3fa26cda44dda
	https://git.kernel.org/stable/c/1793249c067a4b28e1aba0ad0e4d73aa9f9e165a
	https://git.kernel.org/stable/c/1ebbbef47d11cc90219c081492ccf995aaa3e9b3
	https://git.kernel.org/stable/c/9597ab9a8296ab337e6820f8a717ff621078b632