CVE-2026-64148: pds_core: fix error handling in pdsc_devcmd_wait

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

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

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

pds_core: fix error handling in pdsc_devcmd_wait

Fix two cases where pdsc_devcmd_wait() returns stale success from
the completion register instead of an error:

1. FW crash: If firmware stops running, the wait loop breaks early with
   running=false. The condition "if ((!done || timeout) && running)" is
   false, so error handling is bypassed and stale status is returned.
   Check !running first and return -ENXIO.

2. Timeout: If a command times out, err is set to -ETIMEDOUT but then
   overwritten by pdsc_err_to_errno(status) which reads stale status.
   Return -ETIMEDOUT immediately after cleaning up.

Both errors now propagate to pdsc_devcmd_locked() which queues
health_work for recovery.

The Linux kernel CVE team has assigned CVE-2026-64148 to this issue.


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

	Issue introduced in 6.4 with commit 45d76f492938cdc27ddadc16e1e75103f4cfbf56 and fixed in 6.6.142 with commit 3231aff8ab26111c54e630b1a200fc43a729dd14
	Issue introduced in 6.4 with commit 45d76f492938cdc27ddadc16e1e75103f4cfbf56 and fixed in 6.12.92 with commit 10ae3180095bbe2d378c5b1d6f2f2fd74dda3cc2
	Issue introduced in 6.4 with commit 45d76f492938cdc27ddadc16e1e75103f4cfbf56 and fixed in 6.18.34 with commit 784dd2bdc622ed3cc6ef8e113aa1852e252de36f
	Issue introduced in 6.4 with commit 45d76f492938cdc27ddadc16e1e75103f4cfbf56 and fixed in 7.0.11 with commit 560d559324169fe0583d54c475b5329550a86f71
	Issue introduced in 6.4 with commit 45d76f492938cdc27ddadc16e1e75103f4cfbf56 and fixed in 7.1 with commit 0e46b6635b03d29807f810c3b415c4755a3f958d

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-2026-64148
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/net/ethernet/amd/pds_core/dev.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/3231aff8ab26111c54e630b1a200fc43a729dd14
	https://git.kernel.org/stable/c/10ae3180095bbe2d378c5b1d6f2f2fd74dda3cc2
	https://git.kernel.org/stable/c/784dd2bdc622ed3cc6ef8e113aa1852e252de36f
	https://git.kernel.org/stable/c/560d559324169fe0583d54c475b5329550a86f71
	https://git.kernel.org/stable/c/0e46b6635b03d29807f810c3b415c4755a3f958d