linux-cve-announce - CVE-2025-38417: ice: fix eswitch code memory leak in reset scenario

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Message-ID: <2025072546-CVE-2025-38417-12d4@gregkh>
Date: Fri, 25 Jul 2025 16:05:46 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38417: ice: fix eswitch code memory leak in reset scenario

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

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

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

ice: fix eswitch code memory leak in reset scenario

Add simple eswitch mode checker in attaching VF procedure and allocate
required port representor memory structures only in switchdev mode.
The reset flows triggers VF (if present) detach/attach procedure.
It might involve VF port representor(s) re-creation if the device is
configured is switchdev mode (not legacy one).
The memory was blindly allocated in current implementation,
regardless of the mode and not freed if in legacy mode.

Kmemeleak trace:
unreferenced object (percpu) 0x7e3bce5b888458 (size 40):
  comm "bash", pid 1784, jiffies 4295743894
  hex dump (first 32 bytes on cpu 45):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace (crc 0):
    pcpu_alloc_noprof+0x4c4/0x7c0
    ice_repr_create+0x66/0x130 [ice]
    ice_repr_create_vf+0x22/0x70 [ice]
    ice_eswitch_attach_vf+0x1b/0xa0 [ice]
    ice_reset_all_vfs+0x1dd/0x2f0 [ice]
    ice_pci_err_resume+0x3b/0xb0 [ice]
    pci_reset_function+0x8f/0x120
    reset_store+0x56/0xa0
    kernfs_fop_write_iter+0x120/0x1b0
    vfs_write+0x31c/0x430
    ksys_write+0x61/0xd0
    do_syscall_64+0x5b/0x180
    entry_SYSCALL_64_after_hwframe+0x76/0x7e

Testing hints (ethX is PF netdev):
- create at least one VF
    echo 1 > /sys/class/net/ethX/device/sriov_numvfs
- trigger the reset
    echo 1 > /sys/class/net/ethX/device/reset

The Linux kernel CVE team has assigned CVE-2025-38417 to this issue.


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

	Issue introduced in 6.12 with commit 415db8399d06a45ebd7b7d26b951f831a4b01801 and fixed in 6.12.35 with commit d6715193de439b79f1d6a4c03593c7529239b545
	Issue introduced in 6.12 with commit 415db8399d06a45ebd7b7d26b951f831a4b01801 and fixed in 6.15.4 with commit e97a7a051b55f55f276c1568491d0ed7f890ee94
	Issue introduced in 6.12 with commit 415db8399d06a45ebd7b7d26b951f831a4b01801 and fixed in 6.16-rc3 with commit 48c8b214974dc55283bd5f12e3a483b27c403bbc

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-2025-38417
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_eswitch.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/d6715193de439b79f1d6a4c03593c7529239b545
	https://git.kernel.org/stable/c/e97a7a051b55f55f276c1568491d0ed7f890ee94
	https://git.kernel.org/stable/c/48c8b214974dc55283bd5f12e3a483b27c403bbc