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CVE-2022-50409

In the Linux kernel, the following vulnerability has been resolved:

net: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory

Fixes the below NULL pointer dereference:

  [...]
  [   14.471200] Call Trace:
  [   14.471562]  <TASK>
  [   14.471882]  lock_acquire+0x245/0x2e0
  [   14.472416]  ? remove_wait_queue+0x12/0x50
  [   14.473014]  ? _raw_spin_lock_irqsave+0x17/0x50
  [   14.473681]  _raw_spin_lock_irqsave+0x3d/0x50
  [   14.474318]  ? remove_wait_queue+0x12/0x50
  [   14.474907]  remove_wait_queue+0x12/0x50
  [   14.475480]  sk_stream_wait_memory+0x20d/0x340
  [   14.476127]  ? do_wait_intr_irq+0x80/0x80
  [   14.476704]  do_tcp_sendpages+0x287/0x600
  [   14.477283]  tcp_bpf_push+0xab/0x260
  [   14.477817]  tcp_bpf_sendmsg_redir+0x297/0x500
  [   14.478461]  ? __local_bh_enable_ip+0x77/0xe0
  [   14.479096]  tcp_bpf_send_verdict+0x105/0x470
  [   14.479729]  tcp_bpf_sendmsg+0x318/0x4f0
  [   14.480311]  sock_sendmsg+0x2d/0x40
  [   14.480822]  ____sys_sendmsg+0x1b4/0x1c0
  [   14.481390]  ? copy_msghdr_from_user+0x62/0x80
  [   14.482048]  ___sys_sendmsg+0x78/0xb0
  [   14.482580]  ? vmf_insert_pfn_prot+0x91/0x150
  [   14.483215]  ? __do_fault+0x2a/0x1a0
  [   14.483738]  ? do_fault+0x15e/0x5d0
  [   14.484246]  ? __handle_mm_fault+0x56b/0x1040
  [   14.484874]  ? lock_is_held_type+0xdf/0x130
  [   14.485474]  ? find_held_lock+0x2d/0x90
  [   14.486046]  ? __sys_sendmsg+0x41/0x70
  [   14.486587]  __sys_sendmsg+0x41/0x70
  [   14.487105]  ? intel_pmu_drain_pebs_core+0x350/0x350
  [   14.487822]  do_syscall_64+0x34/0x80
  [   14.488345]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
  [...]

The test scenario has the following flow:

thread1                               thread2
-----------                           ---------------
 tcp_bpf_sendmsg
  tcp_bpf_send_verdict
   tcp_bpf_sendmsg_redir              sock_close
    tcp_bpf_push_locked                 __sock_release
     tcp_bpf_push                         //inet_release
      do_tcp_sendpages                    sock->ops->release
       sk_stream_wait_memory          	   // tcp_close
          sk_wait_event                      sk->sk_prot->close
           release_sock(__sk);
            ***
                                                lock_sock(sk);
                                                  __tcp_close
                                                    sock_orphan(sk)
                                                      sk->sk_wq  = NULL
                                                release_sock
            ****
           lock_sock(__sk);
          remove_wait_queue(sk_sleep(sk), &wait);
             sk_sleep(sk)
             //NULL pointer dereference
             &rcu_dereference_raw(sk->sk_wq)->wait

While waiting for memory in thread1, the socket is released with its wait
queue because thread2 has closed it. This caused by tcp_bpf_send_verdict
didn't increase the f_count of psock->sk_redir->sk_socket->file in thread1.

We should check if SOCK_DEAD flag is set on wakeup in sk_stream_wait_memory
before accessing the wait queue.

Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD
Diese Information steht angemeldeten Benutzern zur Verfügung.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
Produkt Linux
Default Statusunaffected
Version < 1f48ab20b80f39c0d85119243109d02946fde6d5
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < 5fe03917bb017d9af68a95f989f1c122eebc69a6
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < a76462dbdd8bddcbeec9463bc9e54e509b860762
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < 65029aaedd15d9fe5ea1a899134e236d83f627bb
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < 124b7c773271f06af5a2cea694b283cdb5275cf5
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < 35f5e70bdfa7432762ac4ffa75e5a7574ac5563e
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < 435f5aa4421782af197b98d8525263977be4af5c
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
Version < 3f8ef65af927db247418d4e1db49164d7a158fc5
Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Status affected
HerstellerLinux
Produkt Linux
Default Statusaffected
Version <= 4.14.*
Version 4.14.296
Status unaffected
Version <= 4.19.*
Version 4.19.262
Status unaffected
Version <= 5.4.*
Version 5.4.220
Status unaffected
Version <= 5.10.*
Version 5.10.150
Status unaffected
Version <= 5.15.*
Version 5.15.75
Status unaffected
Version <= 5.19.*
Version 5.19.17
Status unaffected
Version <= 6.0.*
Version 6.0.3
Status unaffected
Version <= *
Version 6.1
Status unaffected
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.03% 0.078
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String