linux-cve-announce - CVE-2025-21974: eth: bnxt: return fail if interface is down in bnxt_queue_mem

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Message-ID: <2025040147-CVE-2025-21974-1526@gregkh>
Date: Tue,  1 Apr 2025 16:45:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21974: eth: bnxt: return fail if interface is down in bnxt_queue_mem_alloc()

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

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

eth: bnxt: return fail if interface is down in bnxt_queue_mem_alloc()

The bnxt_queue_mem_alloc() is called to allocate new queue memory when
a queue is restarted.
It internally accesses rx buffer descriptor corresponding to the index.
The rx buffer descriptor is allocated and set when the interface is up
and it's freed when the interface is down.
So, if queue is restarted if interface is down, kernel panic occurs.

Splat looks like:
 BUG: unable to handle page fault for address: 000000000000b240
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 3 UID: 0 PID: 1563 Comm: ncdevmem2 Not tainted 6.14.0-rc2+ #9 844ddba6e7c459cafd0bf4db9a3198e
 Hardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021
 RIP: 0010:bnxt_queue_mem_alloc+0x3f/0x4e0 [bnxt_en]
 Code: 41 54 4d 89 c4 4d 69 c0 c0 05 00 00 55 48 89 f5 53 48 89 fb 4c 8d b5 40 05 00 00 48 83 ec 15
 RSP: 0018:ffff9dcc83fef9e8 EFLAGS: 00010202
 RAX: ffffffffc0457720 RBX: ffff934ed8d40000 RCX: 0000000000000000
 RDX: 000000000000001f RSI: ffff934ea508f800 RDI: ffff934ea508f808
 RBP: ffff934ea508f800 R08: 000000000000b240 R09: ffff934e84f4b000
 R10: ffff9dcc83fefa30 R11: ffff934e84f4b000 R12: 000000000000001f
 R13: ffff934ed8d40ac0 R14: ffff934ea508fd40 R15: ffff934e84f4b000
 FS:  00007fa73888c740(0000) GS:ffff93559f780000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 000000000000b240 CR3: 0000000145a2e000 CR4: 00000000007506f0
 PKRU: 55555554
 Call Trace:
  <TASK>
  ? __die+0x20/0x70
  ? page_fault_oops+0x15a/0x460
  ? exc_page_fault+0x6e/0x180
  ? asm_exc_page_fault+0x22/0x30
  ? __pfx_bnxt_queue_mem_alloc+0x10/0x10 [bnxt_en 7f85e76f4d724ba07471d7e39d9e773aea6597b7]
  ? bnxt_queue_mem_alloc+0x3f/0x4e0 [bnxt_en 7f85e76f4d724ba07471d7e39d9e773aea6597b7]
  netdev_rx_queue_restart+0xc5/0x240
  net_devmem_bind_dmabuf_to_queue+0xf8/0x200
  netdev_nl_bind_rx_doit+0x3a7/0x450
  genl_family_rcv_msg_doit+0xd9/0x130
  genl_rcv_msg+0x184/0x2b0
  ? __pfx_netdev_nl_bind_rx_doit+0x10/0x10
  ? __pfx_genl_rcv_msg+0x10/0x10
  netlink_rcv_skb+0x54/0x100
  genl_rcv+0x24/0x40
...

The Linux kernel CVE team has assigned CVE-2025-21974 to this issue.


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

	Issue introduced in 6.11 with commit 2d694c27d32efc9467a8a20e4ad641ab5adfd07d and fixed in 6.12.20 with commit 14eb5f0d6554653f4b159835c2f77b2a9bd7e9be
	Issue introduced in 6.11 with commit 2d694c27d32efc9467a8a20e4ad641ab5adfd07d and fixed in 6.13.8 with commit d3b8cd8a8a98c7c83a693bd651f1919be36a57f2
	Issue introduced in 6.11 with commit 2d694c27d32efc9467a8a20e4ad641ab5adfd07d and fixed in 6.14 with commit ca2456e073957781e1184de68551c65161b2bd30

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-2025-21974
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/broadcom/bnxt/bnxt.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/14eb5f0d6554653f4b159835c2f77b2a9bd7e9be
	https://git.kernel.org/stable/c/d3b8cd8a8a98c7c83a693bd651f1919be36a57f2
	https://git.kernel.org/stable/c/ca2456e073957781e1184de68551c65161b2bd30