CVE-2025-71126 in Linux
Résumé
par VulDB • 25/05/2026
Dans le noyau Linux, la vulnérabilité suivante a été corrigée :
mptcp : éviter un blocage (deadlock) lors de la bascule (fallback) pendant la réinjection
Jakub a signalé un blocage (deadlock) MPTCP lors de la bascule (fallback) :
WARNING: possible recursive locking detected 6.18.0-rc7-virtme #1 Not tainted -------------------------------------------- mptcp_connect/20858 is trying to acquire lock: ff1100001da18b60 (&msk->fallback_lock){+.-.}-{3:3}, at: __mptcp_try_fallback+0xd8/0x280
but task is already holding lock: ff1100001da18b60 (&msk->fallback_lock){+.-.}-{3:3}, at: __mptcp_retrans+0x352/0xaa0
other info that might help us debug this: Possible unsafe locking scenario:
CPU0 ---- lock(&msk->fallback_lock); lock(&msk->fallback_lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
3 locks held by mptcp_connect/20858: #0: ff1100001da18b60 (&msk->fallback_lock){+.-.}-{3:3}, at: __mptcp_retrans+0x352/0xaa0
#1: ffff888103800000 (&sk->sk_lock-AF_INET){+.+.}-{3:3}, at: mptcp_write_xmit+0x100/0x1000
#2: ffff888103800000 (&sk->sk_lock-AF_INET){+.+.}-{3:3}, at: mptcp_write_xmit+0x100/0x1000
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