FKIE_CVE-2026-98646

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-19 10:19
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/23da88d1597ee7fdda373e1530284b763710911f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55bbebf2829c3f47c5a48fc261740301d0f25f48
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b52417c6196e05618a3b5d9753dbed9adef0166
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaab8cab451b9502ce224cd202550375b894a467
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee7246bccb9da66076dd8094daa48bdc761d6b76
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/inet_connection_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "23da88d1597ee7fdda373e1530284b763710911f",
              "status": "affected",
              "version": "4ddbcb886268af8d12a23e6640b39d1d9c652b1b",
              "versionType": "git"
            },
            {
              "lessThan": "5b52417c6196e05618a3b5d9753dbed9adef0166",
              "status": "affected",
              "version": "4ddbcb886268af8d12a23e6640b39d1d9c652b1b",
              "versionType": "git"
            },
            {
              "lessThan": "55bbebf2829c3f47c5a48fc261740301d0f25f48",
              "status": "affected",
              "version": "4ddbcb886268af8d12a23e6640b39d1d9c652b1b",
              "versionType": "git"
            },
            {
              "lessThan": "ee7246bccb9da66076dd8094daa48bdc761d6b76",
              "status": "affected",
              "version": "4ddbcb886268af8d12a23e6640b39d1d9c652b1b",
              "versionType": "git"
            },
            {
              "lessThan": "eaab8cab451b9502ce224cd202550375b894a467",
              "status": "affected",
              "version": "4ddbcb886268af8d12a23e6640b39d1d9c652b1b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/inet_connection_sock.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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 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 (\u0026p-\u003elock){+.+.}-{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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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\u0027s\nrcu_read_lock(), it must not reschedule or report a quiescent state there."
    }
  ],
  "id": "CVE-2026-98646",
  "lastModified": "2026-10-19T10:19:28.983",
  "metrics": {},
  "published": "2026-10-18T16:17:17.853",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/23da88d1597ee7fdda373e1530284b763710911f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/55bbebf2829c3f47c5a48fc261740301d0f25f48"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5b52417c6196e05618a3b5d9753dbed9adef0166"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/eaab8cab451b9502ce224cd202550375b894a467"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ee7246bccb9da66076dd8094daa48bdc761d6b76"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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