linux-cve-announce - CVE-2025-21787: team: better TEAM_OPTION_TYPE

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Message-ID: <2025022608-CVE-2025-21787-c4f2@gregkh>
Date: Wed, 26 Feb 2025 18:17:43 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21787: team: better TEAM_OPTION_TYPE_STRING validation

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

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

team: better TEAM_OPTION_TYPE_STRING validation

syzbot reported following splat [1]

Make sure user-provided data contains one nul byte.

[1]
 BUG: KMSAN: uninit-value in string_nocheck lib/vsprintf.c:633 [inline]
 BUG: KMSAN: uninit-value in string+0x3ec/0x5f0 lib/vsprintf.c:714
  string_nocheck lib/vsprintf.c:633 [inline]
  string+0x3ec/0x5f0 lib/vsprintf.c:714
  vsnprintf+0xa5d/0x1960 lib/vsprintf.c:2843
  __request_module+0x252/0x9f0 kernel/module/kmod.c:149
  team_mode_get drivers/net/team/team_core.c:480 [inline]
  team_change_mode drivers/net/team/team_core.c:607 [inline]
  team_mode_option_set+0x437/0x970 drivers/net/team/team_core.c:1401
  team_option_set drivers/net/team/team_core.c:375 [inline]
  team_nl_options_set_doit+0x1339/0x1f90 drivers/net/team/team_core.c:2662
  genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
  genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
  genl_rcv_msg+0x1214/0x12c0 net/netlink/genetlink.c:1210
  netlink_rcv_skb+0x375/0x650 net/netlink/af_netlink.c:2543
  genl_rcv+0x40/0x60 net/netlink/genetlink.c:1219
  netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
  netlink_unicast+0xf52/0x1260 net/netlink/af_netlink.c:1348
  netlink_sendmsg+0x10da/0x11e0 net/netlink/af_netlink.c:1892
  sock_sendmsg_nosec net/socket.c:718 [inline]
  __sock_sendmsg+0x30f/0x380 net/socket.c:733
  ____sys_sendmsg+0x877/0xb60 net/socket.c:2573
  ___sys_sendmsg+0x28d/0x3c0 net/socket.c:2627
  __sys_sendmsg net/socket.c:2659 [inline]
  __do_sys_sendmsg net/socket.c:2664 [inline]
  __se_sys_sendmsg net/socket.c:2662 [inline]
  __x64_sys_sendmsg+0x212/0x3c0 net/socket.c:2662
  x64_sys_call+0x2ed6/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:47
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The Linux kernel CVE team has assigned CVE-2025-21787 to this issue.


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

	Issue introduced in 3.3 with commit 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 and fixed in 6.1.129 with commit 4512482e4805dd30bc77dec511f2a2edba5cb868
	Issue introduced in 3.3 with commit 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 and fixed in 6.6.79 with commit d071a91fa614ecdf760c29f61f6a7bfb7df796d6
	Issue introduced in 3.3 with commit 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 and fixed in 6.12.16 with commit 4236bf4716589558cc0f3c3612642b2c2141b04e
	Issue introduced in 3.3 with commit 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 and fixed in 6.13.4 with commit 8401cade1918281177974b32c925afdce750d292
	Issue introduced in 3.3 with commit 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 and fixed in 6.14-rc3 with commit 5bef3ac184b5626ea62385d6b82a1992b89d7940

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-2025-21787
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/team/team_core.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/4512482e4805dd30bc77dec511f2a2edba5cb868
	https://git.kernel.org/stable/c/d071a91fa614ecdf760c29f61f6a7bfb7df796d6
	https://git.kernel.org/stable/c/4236bf4716589558cc0f3c3612642b2c2141b04e
	https://git.kernel.org/stable/c/8401cade1918281177974b32c925afdce750d292
	https://git.kernel.org/stable/c/5bef3ac184b5626ea62385d6b82a1992b89d7940