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CVE-2025-39955

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <ae313d14b45eca7a6bb29cb9bf396d977e7d28fb, 5.4.300, <=6.1.*, <=6.12.*, <=6.16.*, 6.12.49, 6.1.154, 6.17, 0, 6.16.9, <a4378dedd6e07e62f2fccb17d78c9665718763d0, <=5.10.*, 5.15.194, <=6.6.*, <7ec092a91ff351dcde89c23e795b73a328274db6, 8336886f786fdacbc19b719c1f7ea91eb70706d4, <=5.4.*, <dfd06131107e7b699ef1e2a24ed2f7d17c917753, <fa4749c065644af4db496b338452a69a3e5147d9, 6.6.108, 5.10.245, <3.7, <45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01, <33a4fdf0b4a25f8ce65380c3b0136b407ca57609, <=*, 3.7, <=5.15.*, <17d699727577814198d744d6afe54735c6b54c99

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: Clear tcp_sk(sk)->fastopen_rsk in tcp_disconnect(). syzbot reported the splat below where a socket had tcp_sk(sk)->fastopen_rsk in the TCP_ESTABLISHED state. [0] syzbot reused the server-side TCP Fast Open socket as a new client before the TFO socket completes 3WHS: 1. accept() 2. connect(AF_UNSPEC) 3. connect() to another destination As of accept(), sk->sk_state is TCP_SYN_RECV, and tcp_disconnect() changes it to TCP_CLOSE and makes connect() possible, which restarts timers. Since tcp_disconnect() forgot to clear tcp_sk(sk)->fastopen_rsk, the retransmit timer triggered the warning and the intended packet was not retransmitted. Let's call reqsk_fastopen_remove() in tcp_disconnect(). [0]: WARNING: CPU: 2 PID: 0 at net/ipv4/tcp_timer.c:542 tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7)) Modules linked in: CPU: 2 UID: 0 PID: 0 Comm: swapper/2 Not tainted 6.17.0-rc5-g201825fb4278 #62 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:tcp_retransmit_timer (net/ipv4/tcp_timer.c:542 (discriminator 7)) Code: 41 55 41 54 55 53 48 8b af b8 08 00 00 48 89 fb 48 85 ed 0f 84 55 01 00 00 0f b6 47 12 3c 03 74 0c 0f b6 47 12 3c 04 74 04 90 <0f> 0b 90 48 8b 85 c0 00 00 00 48 89 ef 48 8b 40 30 e8 6a 4f 06 3e RSP: 0018:ffffc900002f8d40 EFLAGS: 00010293 RAX: 0000000000000002 RBX: ffff888106911400 RCX: 0000000000000017 RDX: 0000000002517619 RSI: ffffffff83764080 RDI: ffff888106911400 RBP: ffff888106d5c000 R08: 0000000000000001 R09: ffffc900002f8de8 R10: 00000000000000c2 R11: ffffc900002f8ff8 R12: ffff888106911540 R13: ffff888106911480 R14: ffff888106911840 R15: ffffc900002f8de0 FS: 0000000000000000(0000) GS:ffff88907b768000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8044d69d90 CR3: 0000000002c30003 CR4: 0000000000370ef0 Call Trace: <IRQ> tcp_write_timer (net/ipv4/tcp_timer.c:738) call_timer_fn (kernel/time/timer.c:1747) __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2372) timer_expire_remote (kernel/time/timer.c:2385 kernel/time/timer.c:2376 kernel/time/timer.c:2135) tmigr_handle_remote_up (kernel/time/timer_migration.c:944 kernel/time/timer_migration.c:1035) __walk_groups.isra.0 (kernel/time/timer_migration.c:533 (discriminator 1)) tmigr_handle_remote (kernel/time/timer_migration.c:1096) handle_softirqs (./arch/x86/include/asm/jump_label.h:36 ./include/trace/events/irq.h:142 kernel/softirq.c:580) irq_exit_rcu (kernel/softirq.c:614 kernel/softirq.c:453 kernel/softirq.c:680 kernel/softirq.c:696) sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1050 (discriminator 35) arch/x86/kernel/apic/apic.c:1050 (discriminator 35)) </IRQ>

Gravité et risque d'exploitation

CVE-2025-39955 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 0.16 %, ce qui la place devant 4.9 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <ae313d14b45eca7a6bb29cb9bf396d977e7d28fb, 5.4.300, <=6.1.*, <=6.12.*, <=6.16.*, 6.12.49, 6.1.154, 6.17, 0, 6.16.9, <a4378dedd6e07e62f2fccb17d78c9665718763d0, <=5.10.*, 5.15.194, <=6.6.*, <7ec092a91ff351dcde89c23e795b73a328274db6, 8336886f786fdacbc19b719c1f7ea91eb70706d4, <=5.4.*, <dfd06131107e7b699ef1e2a24ed2f7d17c917753, <fa4749c065644af4db496b338452a69a3e5147d9, 6.6.108, 5.10.245, <3.7, <45c8a6cc2bcd780e634a6ba8e46bffbdf1fc5c01, <33a4fdf0b4a25f8ce65380c3b0136b407ca57609, <=*, 3.7, <=5.15.*, <17d699727577814198d744d6afe54735c6b54c99) 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

Rechercher une autre CVE