CVE-2025-21787

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

Gravité et risque d'exploitation

CVE-2025-21787 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.27 %, ce qui la place devant 18.3 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <5bef3ac184b5626ea62385d6b82a1992b89d7940, <=6.1.*, <4236bf4716589558cc0f3c3612642b2c2141b04e, <=6.12.*, 3d249d4ca7d0ed6629a135ea1ea21c72286c0d80, 0, <d071a91fa614ecdf760c29f61f6a7bfb7df796d6, <8401cade1918281177974b32c925afdce750d292, <7c30483d0f6bdb2230e10e3e4be5167927eac7a0, <3.3, <4512482e4805dd30bc77dec511f2a2edba5cb868, 6.14, <=5.10.*, <=6.6.*, 6.1.129, 6.12.16, <=5.4.*, 5.4.291, 3.3, <f443687ad20c70320d1248f35f57bf46cac8df0a, 6.13.4, 5.15.179, <7f5af50f3aa0af8cbef9fb76fffeed69e8143f59, <=*, <=5.15.*, 5.10.235, <=6.13.*, 6.6.79) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/7c30483d0f6bdb2230e10e3e4be5167927eac7a0
• https://git.kernel.org/stable/c/7f5af50f3aa0af8cbef9fb76fffeed69e8143f59
• https://git.kernel.org/stable/c/f443687ad20c70320d1248f35f57bf46cac8df0a
• 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