CVE-2026-68466: mtd: rawnand: lpc32xx_slc: fail DMA transfer on completion timeout

From: Greg Kroah-Hartman <[email protected]>

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

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

mtd: rawnand: lpc32xx_slc: fail DMA transfer on completion timeout

lpc32xx_xmit_dma() waits for the DMA completion callback but ignores
wait_for_completion_timeout(). A timed out DMA transfer is therefore
unmapped and reported as successful to the NAND read/write path.

Return -ETIMEDOUT when the completion wait expires. Terminate the DMA
channel before unmapping the scatterlist so the timed out transfer cannot
continue to access the buffer after the error is returned.

The Linux kernel CVE team has assigned CVE-2026-68466 to this issue.


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

	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 5.10.261 with commit 307e4f4c1d4e1575b3495ecc6e41aa2adc40f491
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 5.15.212 with commit c367af37ce7238c96c6071337149099467160746
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 6.1.178 with commit 623c4d8e740debb4af28981e3d4e209f9d0260a4
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 6.6.145 with commit bd4a622786f92e1f183f7557ab89dd32891cef60
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 6.12.97 with commit 8f5c3ee53a5dc1a0f7cfd780485f2c8b5d17f91d
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 6.18.40 with commit cf7258f57d18026b8f77c0e80ff1805e9caf7250
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 7.1.5 with commit cb2031f8b226efbd13735c07b075e5f14ec11f6d
	Issue introduced in 3.7 with commit 2944a44da09e46b6db2fd2c3334f242b09e05c43 and fixed in 7.2-rc4 with commit 17a8ce84964f243c8f89dc7353ac7e8d3137bc74

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-2026-68466
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/mtd/nand/raw/lpc32xx_slc.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/307e4f4c1d4e1575b3495ecc6e41aa2adc40f491
	https://git.kernel.org/stable/c/c367af37ce7238c96c6071337149099467160746
	https://git.kernel.org/stable/c/623c4d8e740debb4af28981e3d4e209f9d0260a4
	https://git.kernel.org/stable/c/bd4a622786f92e1f183f7557ab89dd32891cef60
	https://git.kernel.org/stable/c/8f5c3ee53a5dc1a0f7cfd780485f2c8b5d17f91d
	https://git.kernel.org/stable/c/cf7258f57d18026b8f77c0e80ff1805e9caf7250
	https://git.kernel.org/stable/c/cb2031f8b226efbd13735c07b075e5f14ec11f6d
	https://git.kernel.org/stable/c/17a8ce84964f243c8f89dc7353ac7e8d3137bc74