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CVE-2026-98646

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
Linux•Linux•Versions : <=6.12.*, 6.18.55, <6.5, 0, 6.12.112, 6.5, 6.6.158, <=6.6.*, <eaab8cab451b9502ce224cd202550375b894a467, 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, <55bbebf2829c3f47c5a48fc261740301d0f25f48, <23da88d1597ee7fdda373e1530284b763710911f, <=6.18.*, <=7.2.*, <ee7246bccb9da66076dd8094daa48bdc761d6b76, 7.2.9, <=*, <5b52417c6196e05618a3b5d9753dbed9adef0166, 7.3

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: Skip cond_resched() in inet_csk_listen_stop() under BPF context bpf_sock_destroy() runs from the tcp iterator, under rcu_read_lock(). If the sock is a listener that still has children in its accept queue, tcp_abort() ends up in inet_csk_listen_stop() and the cond_resched() there trips the debug check: BUG: sleeping function called from invalid context at net/ipv4/inet_connection_sock.c:1523 in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 628, name: test_progs preempt_count: 0, expected: 0 RCU nest depth: 1, expected: 0 locks held by test_progs/628: 3, last CPU#3: #0: ffff8881158cee18 (&p->lock){+.+.}-{4:4}, at: bpf_seq_read+0x56/0x1210 #1: ffff8881106bb858 (sk_lock-AF_INET6){+.+.}-{0:0}, at: bpf_iter_tcp_seq_show+0x32b/0x4b0 #2: ffffffffb435af20 (rcu_read_lock){....}-{1:3}, at: bpf_iter_run_prog+0x46b/0xde0 CPU: 3 UID: 0 PID: 628 Comm: test_progs Tainted: G W 7.2.0+ #65 PREEMPT Tainted: [W]=WARN Call Trace: <TASK> dump_stack_lvl+0xc1/0xf0 dump_stack+0x10/0x20 __might_resched+0x3d2/0x610 inet_csk_listen_stop+0x7b/0xbf0 tcp_abort+0x23b/0x3b0 bpf_sock_destroy+0xfc/0x140 bpf_prog_448133d24601754f_iter_tcp6_server+0x81/0x8a bpf_iter_run_prog+0x538/0xde0 bpf_iter_tcp_seq_show+0x26b/0x4b0 bpf_seq_read+0x424/0x1210 vfs_read+0x197/0xe40 ksys_read+0x119/0x240 __x64_sys_read+0x72/0xc0 x64_sys_call+0x647/0x27e0 do_syscall_64+0xe5/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fad39b28aca RSP: 002b:00007ffc381c61c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007ffc381c6a88 RCX: 00007fad39b28aca RDX: 0000000000000032 RSI: 00007ffc381c6250 RDI: 0000000000000014 RBP: 00007ffc381c61e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 000055f077c1bbb0 R15: 00007fad3a0f3000 </TASK> The commit that added the kfunc already guards lock_sock() in tcp_abort() and udp_abort() with has_current_bpf_ctx(), but missed the listener path. Do the same for the cond_resched(). The loop runs inside the iterator's rcu_read_lock(), it must not reschedule or report a quiescent state there.

Gravité et risque d'exploitation

CVE-2026-98646 obtient un score CVSS de 0.0/10, soit une gravité non évaluée.

Que faire ?

  • Vérifiez si Linux (versions <=6.12.*, 6.18.55, <6.5, 0, 6.12.112, 6.5, 6.6.158, <=6.6.*, <eaab8cab451b9502ce224cd202550375b894a467, 4ddbcb886268af8d12a23e6640b39d1d9c652b1b, <55bbebf2829c3f47c5a48fc261740301d0f25f48, <23da88d1597ee7fdda373e1530284b763710911f, <=6.18.*, <=7.2.*, <ee7246bccb9da66076dd8094daa48bdc761d6b76, 7.2.9, <=*, <5b52417c6196e05618a3b5d9753dbed9adef0166, 7.3) 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

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