CVE-2025-21787: team: better TEAM_OPTION_TYPE_STRING validation
First published: Thu Feb 27 2025(Updated: )
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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| >=3.3<6.1.129 | ||
| >=6.2<6.6.79 | ||
| >=6.7<6.12.16 | ||
| >=6.13<6.13.4 | ||
| =6.14-rc1 | ||
| =6.14-rc2 |
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Reference Links
- https://git.kernel.org/stable/c/4236bf4716589558cc0f3c3612642b2c2141b04e
- https://git.kernel.org/stable/c/4512482e4805dd30bc77dec511f2a2edba5cb868
- https://git.kernel.org/stable/c/5bef3ac184b5626ea62385d6b82a1992b89d7940
- https://git.kernel.org/stable/c/8401cade1918281177974b32c925afdce750d292
- https://git.kernel.org/stable/c/d071a91fa614ecdf760c29f61f6a7bfb7df796d6
- https://git.kernel.org/stable/c/7c30483d0f6bdb2230e10e3e4be5167927eac7a0
- https://git.kernel.org/stable/c/7f5af50f3aa0af8cbef9fb76fffeed69e8143f59
- https://git.kernel.org/stable/c/f443687ad20c70320d1248f35f57bf46cac8df0a
Frequently Asked Questions
What is the severity of CVE-2025-21787?
The severity of CVE-2025-21787 has been classified as medium due to the potential for uninitialized value exploitation in the Linux kernel.
How do I fix CVE-2025-21787?
To fix CVE-2025-21787, you should update to the latest version of the Linux kernel that addresses this vulnerability.
What systems are affected by CVE-2025-21787?
CVE-2025-21787 affects all versions of the Linux kernel prior to the patch addressing the vulnerability.
Can CVE-2025-21787 lead to remote code execution?
CVE-2025-21787 does not directly lead to remote code execution but can lead to other risks due to uninitialized values.
Is user input validation important in CVE-2025-21787?
Yes, proper user input validation is crucial in CVE-2025-21787 to prevent issues with the TEAM_OPTION_TYPE_STRING.
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- agent/software-canonical-lookup
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- collector/nvd-api
- source/NVD
- agent/last-modified-date
- agent/softwarecombine
- agent/tags
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- vendor/linux
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- version/linux kernel/6.2
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- version/linux kernel/6.14-rc1
- version/linux kernel/6.14-rc2