CVE-2025-37752

Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375

Gravité et risque d'exploitation

CVE-2025-37752 obtient un score CVSS de 7.8/10, soit une gravité élevée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.30 %, ce qui la place devant 21.6 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <=6.14.*, e12f6013d0a69660e8b99bfe381b9546ae667328, 1e6d9d87626cf89eeffb4d943db12cb5b10bf961, <6c589aa318023690f1606c666a7fb5f4c1c9c219, <b36a68192037d1614317a09b0d78c7814e2eecf9, 0, <8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4, 6.13.2, 6.14, <6.13.12, <5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d, <=6.6.*, 6.6.76, 6.12.24, 7d8947f2153ee9c5ab4cb17861a11cc45f30e8c4, 6.1.129, 833e9a1c27b82024db7ff5038a51651f48f05e5e, 6.13.12, 6.1.135, 6.14.3, <f86293adce0c201cfabb283ef9d6f21292089bb8, 10685681bafce6febb39770f3387621bf5d67d0b, 35d0137305ae2f97260a9047f445bd4434bd6cc7, 6.15, <d2718324f9e329b10ddc091fba5a0ba2b9d4d96a, <b3bf8f63e6179076b57c9de660c9f80b5abefe70, 1b562b7f9231432da40d12e19786c1bd7df653a7, 6.12.13, <6.12.24, <=*, <6.6.88, <6.14, <1348214fa042a71406964097e743c87a42c85a49, 7fefc294204f10a3405f175f4ac2be16d63f135e, <7d62ded97db6b7c94c891f704151f372b1ba4688, <6.1.135, <=6.13.*, 6.6.88) 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/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4
• https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688
• https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219
• https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49
• https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a
• https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8
• https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d
• https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9
• https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70