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CVE-2025-21787 – Linux Team Vulnerability – String Validation

The following table lists the changes that have been made to the
CVE-2025-21787 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 27, 2025

    Action Type Old Value New Value
    Added 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
    Added Reference https://git.kernel.org/stable/c/4236bf4716589558cc0f3c3612642b2c2141b04e
    Added Reference https://git.kernel.org/stable/c/4512482e4805dd30bc77dec511f2a2edba5cb868
    Added Reference https://git.kernel.org/stable/c/5bef3ac184b5626ea62385d6b82a1992b89d7940
    Added Reference https://git.kernel.org/stable/c/8401cade1918281177974b32c925afdce750d292
    Added Reference https://git.kernel.org/stable/c/d071a91fa614ecdf760c29f61f6a7bfb7df796d6
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