CVE-2026-53007: ice: fix potential NULL pointer deref in error path of ice_set_ringparam()

CVE-2026-53007: ice: fix potential NULL pointer deref in error path of ice_set_ringparam()

[Greg Kroah-Hartman]

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

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

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

ice: fix potential NULL pointer deref in error path of ice_set_ringparam()

ice_set_ringparam nullifies tstamp_ring of temporary tx_rings, without
clearing ICE_TX_RING_FLAGS_TXTIME bit.
When ICE_TX_RING_FLAGS_TXTIME is set and the subsequent
ice_setup_tx_ring() call fails, a NULL pointer dereference could happen
in the unwinding sequence:

ice_clean_tx_ring()
-> ice_is_txtime_cfg() == true (ICE_TX_RING_FLAGS_TXTIME is set)
-> ice_free_tx_tstamp_ring()
  -> ice_free_tstamp_ring()
    -> tstamp_ring->desc (NULL deref)

Clear ICE_TX_RING_FLAGS_TXTIME bit to avoid the potential issue.

Note that this potential issue is found by manual code review.
Compile test only since unfortunately I don't have E830 devices.

The Linux kernel CVE team has assigned CVE-2026-53007 to this issue.


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

	Issue introduced in 6.18 with commit ccde82e909467abdf098a8ee6f63e1ecf9a47ce5 and fixed in 7.0.10 with commit c54e3c270384829336b2526033d44ce1aa6dc67c
	Issue introduced in 6.18 with commit ccde82e909467abdf098a8ee6f63e1ecf9a47ce5 and fixed in 7.1 with commit fa28351f970fa5138c7c5dedfe5dea480a0ee065

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-2026-53007
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/intel/ice/ice_ethtool.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/c54e3c270384829336b2526033d44ce1aa6dc67c
	https://git.kernel.org/stable/c/fa28351f970fa5138c7c5dedfe5dea480a0ee065