CVE-2022-50409
Estado: ModificadaMedia (5.5)—
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:
The test scenario has the following flow:
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.
Detalles técnicos trazas, registros y código del informe original
[...]
[ 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
[...]
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)->waitCVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 4
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-476
Referencias
- https://git.kernel.org/stable/c/124b7c773271f06af5a2cea694b283cdb5275cf5
- https://git.kernel.org/stable/c/35f5e70bdfa7432762ac4ffa75e5a7574ac5563e
- https://git.kernel.org/stable/c/3f8ef65af927db247418d4e1db49164d7a158fc5
- https://git.kernel.org/stable/c/435f5aa4421782af197b98d8525263977be4af5c
- https://git.kernel.org/stable/c/65029aaedd15d9fe5ea1a899134e236d83f627bb
- https://git.kernel.org/stable/c/a76462dbdd8bddcbeec9463bc9e54e509b860762
JSON original (NVD)
Mostrar
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"integrityImpact": "NONE",
"userInteraction": "NONE",
"attackComplexity": "LOW",
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: If sock is dead don't access sock's sk_wq in sk_stream_wait_memory\n\nFixes the below NULL pointer dereference:\n\n [...]\n [ 14.471200] Call Trace:\n [ 14.471562] <TASK>\n [ 14.471882] lock_acquire+0x245/0x2e0\n [ 14.472416] ? remove_wait_queue+0x12/0x50\n [ 14.473014] ? _raw_spin_lock_irqsave+0x17/0x50\n [ 14.473681] _raw_spin_lock_irqsave+0x3d/0x50\n [ 14.474318] ? remove_wait_queue+0x12/0x50\n [ 14.474907] remove_wait_queue+0x12/0x50\n [ 14.475480] sk_stream_wait_memory+0x20d/0x340\n [ 14.476127] ? do_wait_intr_irq+0x80/0x80\n [ 14.476704] do_tcp_sendpages+0x287/0x600\n [ 14.477283] tcp_bpf_push+0xab/0x260\n [ 14.477817] tcp_bpf_sendmsg_redir+0x297/0x500\n [ 14.478461] ? __local_bh_enable_ip+0x77/0xe0\n [ 14.479096] tcp_bpf_send_verdict+0x105/0x470\n [ 14.479729] tcp_bpf_sendmsg+0x318/0x4f0\n [ 14.480311] sock_sendmsg+0x2d/0x40\n [ 14.480822] ____sys_sendmsg+0x1b4/0x1c0\n [ 14.481390] ? copy_msghdr_from_user+0x62/0x80\n [ 14.482048] ___sys_sendmsg+0x78/0xb0\n [ 14.482580] ? vmf_insert_pfn_prot+0x91/0x150\n [ 14.483215] ? __do_fault+0x2a/0x1a0\n [ 14.483738] ? do_fault+0x15e/0x5d0\n [ 14.484246] ? __handle_mm_fault+0x56b/0x1040\n [ 14.484874] ? lock_is_held_type+0xdf/0x130\n [ 14.485474] ? find_held_lock+0x2d/0x90\n [ 14.486046] ? __sys_sendmsg+0x41/0x70\n [ 14.486587] __sys_sendmsg+0x41/0x70\n [ 14.487105] ? intel_pmu_drain_pebs_core+0x350/0x350\n [ 14.487822] do_syscall_64+0x34/0x80\n [ 14.488345] entry_SYSCALL_64_after_hwframe+0x63/0xcd\n [...]\n\nThe test scenario has the following flow:\n\nthread1 thread2\n----------- ---------------\n tcp_bpf_sendmsg\n tcp_bpf_send_verdict\n tcp_bpf_sendmsg_redir sock_close\n tcp_bpf_push_locked __sock_release\n tcp_bpf_push //inet_release\n do_tcp_sendpages sock->ops->release\n sk_stream_wait_memory \t // tcp_close\n sk_wait_event sk->sk_prot->close\n release_sock(__sk);\n ***\n lock_sock(sk);\n __tcp_close\n sock_orphan(sk)\n sk->sk_wq = NULL\n release_sock\n ****\n lock_sock(__sk);\n remove_wait_queue(sk_sleep(sk), &wait);\n sk_sleep(sk)\n //NULL pointer dereference\n &rcu_dereference_raw(sk->sk_wq)->wait\n\nWhile waiting for memory in thread1, the socket is released with its wait\nqueue because thread2 has closed it. This caused by tcp_bpf_send_verdict\ndidn't increase the f_count of psock->sk_redir->sk_socket->file in thread1.\n\nWe should check if SOCK_DEAD flag is set on wakeup in sk_stream_wait_memory\nbefore accessing the wait queue."
}
],
"lastModified": "2026-06-17T05:23:29.013",
"configurations": [
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