{"id":"CVE-2026-98646","title":"tcp: Skip cond_resched() in inet_csk_listen_stop() under BPF context","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Skip cond_resched() in inet_csk_listen_stop() under BPF context\n\nbpf_sock_destroy() runs from the tcp iterator, under rcu_read_lock(). If\nthe sock is a listener th…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < 23da88d1597ee7fdda373e1530284b763710911f","Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < 5b52417c6196e05618a3b5d9753dbed9adef0166","Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < 55bbebf2829c3f47c5a48fc261740301d0f25f48","Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < ee7246bccb9da66076dd8094daa48bdc761d6b76","Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < eaab8cab451b9502ce224cd202550375b894a467","Linux 6.5"],"published":"2026-10-18","updated":"2026-10-18","sourceUpdated":"2026-10-18T15:20:17.490Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98646","references":[{"url":"https://git.kernel.org/stable/c/23da88d1597ee7fdda373e1530284b763710911f"},{"url":"https://git.kernel.org/stable/c/5b52417c6196e05618a3b5d9753dbed9adef0166"},{"url":"https://git.kernel.org/stable/c/55bbebf2829c3f47c5a48fc261740301d0f25f48"},{"url":"https://git.kernel.org/stable/c/ee7246bccb9da66076dd8094daa48bdc761d6b76"},{"url":"https://git.kernel.org/stable/c/eaab8cab451b9502ce224cd202550375b894a467"}],"tags":["cve.org"],"ingestedAt":"2026-10-18T15:45:12.226Z","slug":"CVE-2026-98646","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntcp: Skip cond_resched() in inet_csk_listen_stop() under BPF context\n\nbpf_sock_destroy() runs from the tcp iterator, under rcu_read_lock(). If\nthe sock is a listener that still has children in its accept queue,\ntcp_abort() ends up in inet_csk_listen_stop() and the cond_resched()\nthere trips the debug check:\n\nBUG: sleeping function called from invalid context at net/ipv4/inet_connection_sock.c:1523\nin_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 628, name: test_progs\npreempt_count: 0, expected: 0\nRCU nest depth: 1, expected: 0\nlocks held by test_progs/628: 3, last CPU#3:\n #0: ffff8881158cee18 (&p->lock){+.+.}-{4:4}, at: bpf_seq_read+0x56/0x1210\n #1: ffff8881106bb858 (sk_lock-AF_INET6){+.+.}-{0:0}, at: bpf_iter_tcp_seq_show+0x32b/0x4b0\n #2: ffffffffb435af20 (rcu_read_lock){....}-{1:3}, at: bpf_iter_run_prog+0x46b/0xde0\nCPU: 3 UID: 0 PID: 628 Comm: test_progs Tainted: G        W           7.2.0+ #65 PREEMPT\nTainted: [W]=WARN\nCall Trace:\n <TASK>\n dump_stack_lvl+0xc1/0xf0\n dump_stack+0x10/0x20\n __might_resched+0x3d2/0x610\n inet_csk_listen_stop+0x7b/0xbf0\n tcp_abort+0x23b/0x3b0\n bpf_sock_destroy+0xfc/0x140\n bpf_prog_448133d24601754f_iter_tcp6_server+0x81/0x8a\n bpf_iter_run_prog+0x538/0xde0\n bpf_iter_tcp_seq_show+0x26b/0x4b0\n bpf_seq_read+0x424/0x1210\n vfs_read+0x197/0xe40\n ksys_read+0x119/0x240\n __x64_sys_read+0x72/0xc0\n x64_sys_call+0x647/0x27e0\n do_syscall_64+0xe5/0x610\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7fad39b28aca\nRSP: 002b:00007ffc381c61c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000\nRAX: ffffffffffffffda RBX: 00007ffc381c6a88 RCX: 00007fad39b28aca\nRDX: 0000000000000032 RSI: 00007ffc381c6250 RDI: 0000000000000014\nRBP: 00007ffc381c61e0 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003\nR13: 0000000000000000 R14: 000055f077c1bbb0 R15: 00007fad3a0f3000\n </TASK>\n\nThe commit that added the kfunc already guards lock_sock() in tcp_abort()\nand udp_abort() with has_current_bpf_ctx(), but missed the listener path.\nDo the same for the cond_resched(). The loop runs inside the iterator's\nrcu_read_lock(), it must not reschedule or report a quiescent state there.\n\n## Affected\n\n- `Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < 23da88d1597ee7fdda373e1530284b763710911f`\n- `Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < 5b52417c6196e05618a3b5d9753dbed9adef0166`\n- `Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < 55bbebf2829c3f47c5a48fc261740301d0f25f48`\n- `Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < ee7246bccb9da66076dd8094daa48bdc761d6b76`\n- `Linux >= 4ddbcb886268af8d12a23e6640b39d1d9c652b1b < eaab8cab451b9502ce224cd202550375b894a467`\n- `Linux 6.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}