linux-cve-announce - CVE-2025-37955: virtio-net: free xsk_buffs on error in virtnet_xsk_pool

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Message-ID: <2025052002-CVE-2025-37955-5733@gregkh>
Date: Tue, 20 May 2025 18:02:09 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37955: virtio-net: free xsk_buffs on error in virtnet_xsk_pool_enable()

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

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

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

virtio-net: free xsk_buffs on error in virtnet_xsk_pool_enable()

The selftests added to our CI by Bui Quang Minh recently reveals
that there is a mem leak on the error path of virtnet_xsk_pool_enable():

unreferenced object 0xffff88800a68a000 (size 2048):
  comm "xdp_helper", pid 318, jiffies 4294692778
  hex dump (first 32 bytes):
    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):
    __kvmalloc_node_noprof+0x402/0x570
    virtnet_xsk_pool_enable+0x293/0x6a0 (drivers/net/virtio_net.c:5882)
    xp_assign_dev+0x369/0x670 (net/xdp/xsk_buff_pool.c:226)
    xsk_bind+0x6a5/0x1ae0
    __sys_bind+0x15e/0x230
    __x64_sys_bind+0x72/0xb0
    do_syscall_64+0xc1/0x1d0
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

The Linux kernel CVE team has assigned CVE-2025-37955 to this issue.


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

	Issue introduced in 6.11 with commit e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568 and fixed in 6.12.29 with commit 94a6f6c204abb2b2dcd2ce287536cc924469cfb5
	Issue introduced in 6.11 with commit e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568 and fixed in 6.14.7 with commit ba6917810bb4a5a32661fa941717399052b3f0d9
	Issue introduced in 6.11 with commit e9f3962441c0a4d6f16c656e6c8aa02a3ccdd568 and fixed in 6.15-rc6 with commit 4397684a292a71fbc1e815c3e283f7490ddce5ae

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-2025-37955
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/virtio_net.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/94a6f6c204abb2b2dcd2ce287536cc924469cfb5
	https://git.kernel.org/stable/c/ba6917810bb4a5a32661fa941717399052b3f0d9
	https://git.kernel.org/stable/c/4397684a292a71fbc1e815c3e283f7490ddce5ae