CVE-2024-50154
Estado: ModificadaAlta (7)—
In the Linux kernel, the following vulnerability has been resolved:
tcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().
Martin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().
The commit 83fccfc3940c ("inet: fix potential deadlock in reqsk_queue_unlink()") added timer_pending() in reqsk_queue_unlink() not to call del_timer_sync() from reqsk_timer_handler(), but it introduced a small race window.
Before the timer is called, expire_timers() calls detach_timer(timer, true) to clear timer->entry.pprev and marks it as not pending.
If reqsk_queue_unlink() checks timer_pending() just after expire_timers() calls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will continue running and send multiple SYN+ACKs until it expires.
Leer descripción completaMostrar menos
The reported UAF could happen if req->sk is close()d earlier than the timer expiration, which is 63s by default.
The scenario would be
Let's not use timer_pending() by passing the caller context to __inet_csk_reqsk_queue_drop().
Note that reqsk timer is pinned, so the issue does not happen in most use cases. [1]
kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6
Detalles técnicos trazas, registros y código del informe original
"""
We are seeing a use-after-free from a bpf prog attached to
trace_tcp_retransmit_synack. The program passes the req->sk to the
bpf_sk_storage_get_tracing kernel helper which does check for null
before using it.
"""
1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),
but del_timer_sync() is missed
2. reqsk timer is executed and scheduled again
3. req->sk is accept()ed and reqsk_put() decrements rsk_refcnt, but
reqsk timer still has another one, and inet_csk_accept() does not
clear req->sk for non-TFO sockets
4. sk is close()d
5. reqsk timer is executed again, and BPF touches req->sk
[0]
BUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0
Use-after-free read at 0x00000000a891fb3a (in kfence-#1):
bpf_sk_storage_get_tracing+0x2e/0x1b0
bpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda
bpf_trace_run2+0x4c/0xc0
tcp_rtx_synack+0xf9/0x100
reqsk_timer_handler+0xda/0x3d0
run_timer_softirq+0x292/0x8a0
irq_exit_rcu+0xf5/0x320
sysvec_apic_timer_interrupt+0x6d/0x80
asm_sysvec_apic_timer_interrupt+0x16/0x20
intel_idle_irq+0x5a/0xa0
cpuidle_enter_state+0x94/0x273
cpu_startup_entry+0x15e/0x260
start_secondary+0x8a/0x90
secondary_startup_64_no_verify+0xfa/0xfb
allocated by task 0 on cpu 9 at 260507.901592s:
sk_prot_alloc+0x35/0x140
sk_clone_lock+0x1f/0x3f0
inet_csk_clone_lock+0x15/0x160
tcp_create_openreq_child+0x1f/0x410
tcp_v6_syn_recv_sock+0x1da/0x700
tcp_check_req+0x1fb/0x510
tcp_v6_rcv+0x98b/0x1420
ipv6_list_rcv+0x2258/0x26e0
napi_complete_done+0x5b1/0x2990
mlx5e_napi_poll+0x2ae/0x8d0
net_rx_action+0x13e/0x590
irq_exit_rcu+0xf5/0x320
common_interrupt+0x80/0x90
asm_common_interrupt+0x22/0x40
cpuidle_enter_state+0xfb/0x273
cpu_startup_entry+0x15e/0x260
start_secondary+0x8a/0x90
secondary_startup_64_no_verify+0xfa/0xfb
freed by task 0 on cpu 9 at 260507.927527s:
rcu_core_si+0x4ff/0xf10
irq_exit_rcu+0xf5/0x320
sysvec_apic_timer_interrupt+0x6d/0x80
asm_sysvec_apic_timer_interrupt+0x16/0x20
cpuidle_enter_state+0xfb/0x273
cpu_startup_entry+0x15e/0x260
start_secondary+0x8a/0x90
secondary_startup_64_no_verify+0xfa/0xfbCVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.56%
- Percentil entre todas las CVEs puntuadas: 45
- 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).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation75 % - Impacto principal
T1059Command and Scripting Interpreterexecution70 %
Vulnerabilidad local (AV:L) con privilegios limitados (PR:L) que permite ejecución de código arbitrario mediante race condition en temporizador TCP; acceso local sin UI requerida típico de escalada de privilegios (T1068) con impacto de ejecución remota (T1059).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-416
- CWE-416
Referencias
- https://git.kernel.org/stable/c/106e457953315e476b3642ef24be25ed862aaba3
- https://git.kernel.org/stable/c/5071beb59ee416e8ab456ac8647a4dabcda823b1
- https://git.kernel.org/stable/c/51e34db64f4e43c7b055ccf881b7f3e0c31bb26d
- https://git.kernel.org/stable/c/8459d61fbf24967839a70235165673148c7c7f17
- https://git.kernel.org/stable/c/997ae8da14f1639ce6fb66a063dab54031cd61b3
- https://git.kernel.org/stable/c/c964bf65f80a14288d767023a1b300b30f5b9cd0
- https://git.kernel.org/stable/c/e8c526f2bdf1845bedaf6a478816a3d06fa78b8f
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
JSON original (NVD)
Mostrar
{
"id": "CVE-2024-50154",
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"metrics": {
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{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"timestamp": "2024-12-11T14:25:48.087506Z"
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"attackComplexity": "LOW",
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},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
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"status": "affected",
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{
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},
{
"status": "affected",
"version": "4.1.11",
"lessThan": "4.2",
"versionType": "semver"
}
],
"programFiles": [
"net/ipv4/inet_connection_sock.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"status": "unaffected",
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},
{
"status": "unaffected",
"version": "5.10.237",
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},
{
"status": "unaffected",
"version": "5.15.170",
"versionType": "semver",
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{
"status": "unaffected",
"version": "6.1.115",
"versionType": "semver",
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{
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{
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},
{
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"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/inet_connection_sock.c"
],
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}
]
}
],
"published": "2024-11-07T10:15:06.987",
"references": [
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"url": "https://git.kernel.org/stable/c/106e457953315e476b3642ef24be25ed862aaba3",
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},
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"source": "af854a3a-2127-422b-91ae-364da2661108"
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{
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"source": "af854a3a-2127-422b-91ae-364da2661108"
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],
"vulnStatus": "Modified",
"weaknesses": [
{
"type": "Primary",
"source": "nvd@nist.gov",
"description": [
{
"lang": "en",
"value": "CWE-416"
}
]
},
{
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"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"description": [
{
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"value": "CWE-416"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp/dccp: Don't use timer_pending() in reqsk_queue_unlink().\n\nMartin KaFai Lau reported use-after-free [0] in reqsk_timer_handler().\n\n \"\"\"\n We are seeing a use-after-free from a bpf prog attached to\n trace_tcp_retransmit_synack. The program passes the req->sk to the\n bpf_sk_storage_get_tracing kernel helper which does check for null\n before using it.\n \"\"\"\n\nThe commit 83fccfc3940c (\"inet: fix potential deadlock in\nreqsk_queue_unlink()\") added timer_pending() in reqsk_queue_unlink() not\nto call del_timer_sync() from reqsk_timer_handler(), but it introduced a\nsmall race window.\n\nBefore the timer is called, expire_timers() calls detach_timer(timer, true)\nto clear timer->entry.pprev and marks it as not pending.\n\nIf reqsk_queue_unlink() checks timer_pending() just after expire_timers()\ncalls detach_timer(), TCP will miss del_timer_sync(); the reqsk timer will\ncontinue running and send multiple SYN+ACKs until it expires.\n\nThe reported UAF could happen if req->sk is close()d earlier than the timer\nexpiration, which is 63s by default.\n\nThe scenario would be\n\n 1. inet_csk_complete_hashdance() calls inet_csk_reqsk_queue_drop(),\n but del_timer_sync() is missed\n\n 2. reqsk timer is executed and scheduled again\n\n 3. req->sk is accept()ed and reqsk_put() decrements rsk_refcnt, but\n reqsk timer still has another one, and inet_csk_accept() does not\n clear req->sk for non-TFO sockets\n\n 4. sk is close()d\n\n 5. reqsk timer is executed again, and BPF touches req->sk\n\nLet's not use timer_pending() by passing the caller context to\n__inet_csk_reqsk_queue_drop().\n\nNote that reqsk timer is pinned, so the issue does not happen in most\nuse cases. [1]\n\n[0]\nBUG: KFENCE: use-after-free read in bpf_sk_storage_get_tracing+0x2e/0x1b0\n\nUse-after-free read at 0x00000000a891fb3a (in kfence-#1):\nbpf_sk_storage_get_tracing+0x2e/0x1b0\nbpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda\nbpf_trace_run2+0x4c/0xc0\ntcp_rtx_synack+0xf9/0x100\nreqsk_timer_handler+0xda/0x3d0\nrun_timer_softirq+0x292/0x8a0\nirq_exit_rcu+0xf5/0x320\nsysvec_apic_timer_interrupt+0x6d/0x80\nasm_sysvec_apic_timer_interrupt+0x16/0x20\nintel_idle_irq+0x5a/0xa0\ncpuidle_enter_state+0x94/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb\n\nkfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, size=2376, cache=TCPv6\n\nallocated by task 0 on cpu 9 at 260507.901592s:\nsk_prot_alloc+0x35/0x140\nsk_clone_lock+0x1f/0x3f0\ninet_csk_clone_lock+0x15/0x160\ntcp_create_openreq_child+0x1f/0x410\ntcp_v6_syn_recv_sock+0x1da/0x700\ntcp_check_req+0x1fb/0x510\ntcp_v6_rcv+0x98b/0x1420\nipv6_list_rcv+0x2258/0x26e0\nnapi_complete_done+0x5b1/0x2990\nmlx5e_napi_poll+0x2ae/0x8d0\nnet_rx_action+0x13e/0x590\nirq_exit_rcu+0xf5/0x320\ncommon_interrupt+0x80/0x90\nasm_common_interrupt+0x22/0x40\ncpuidle_enter_state+0xfb/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb\n\nfreed by task 0 on cpu 9 at 260507.927527s:\nrcu_core_si+0x4ff/0xf10\nirq_exit_rcu+0xf5/0x320\nsysvec_apic_timer_interrupt+0x6d/0x80\nasm_sysvec_apic_timer_interrupt+0x16/0x20\ncpuidle_enter_state+0xfb/0x273\ncpu_startup_entry+0x15e/0x260\nstart_secondary+0x8a/0x90\nsecondary_startup_64_no_verify+0xfa/0xfb"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp/dccp: No use timer_pending() en reqsk_queue_unlink(). Martin KaFai Lau informó de un use-after-free [0] en reqsk_timer_handler(). \"\"\" Estamos viendo un use-after-free de un programa bpf adjunto a trace_tcp_retransmit_synack. El programa pasa el req->sk al ayudante del kernel bpf_sk_storage_get_tracing que comprueba si hay valores nulos antes de usarlo. \"\"\" El commit 83fccfc3940c (\"inet: soluciona un posible bloqueo en reqsk_queue_unlink()\") agregó timer_pending() en reqsk_queue_unlink() para no llamar a del_timer_sync() desde reqsk_timer_handler(), pero introdujo una pequeña ventana de ejecución. Antes de que se llame al temporizador, expire_timers() llama a detach_timer(timer, true) para borrar timer->entry.pprev y lo marca como no pendiente. Si reqsk_queue_unlink() comprueba timer_pending() justo después de que expire_timers() llame a detach_timer(), TCP no detectará del_timer_sync(); el temporizador reqsk seguirá funcionando y enviará varios SYN+ACK hasta que expire. El UAF informado podría ocurrir si se cierra req->sk antes de la expiración del temporizador, que es 63 s por defecto. El escenario sería 1. inet_csk_complete_hashdance() llama a inet_csk_reqsk_queue_drop(), pero se omite del_timer_sync() 2. se ejecuta el temporizador reqsk y se programa nuevamente 3. se acepta req->sk y reqsk_put() decrementa rsk_refcnt, pero el temporizador reqsk aún tiene otro, e inet_csk_accept() no borra req->sk para sockets que no sean TFO 4. se cierra sk 5. se ejecuta nuevamente el temporizador reqsk y BPF toca req->sk No usemos timer_pending() pasando el contexto del llamador a __inet_csk_reqsk_queue_drop(). Tenga en cuenta que el temporizador reqsk está fijado, por lo que el problema no ocurre en la mayoría de los casos de uso. [1] [0] ERROR: KFENCE: lectura de use-after-free en bpf_sk_storage_get_tracing+0x2e/0x1b0 Lectura de use-after-free en 0x00000000a891fb3a (en kfence-#1): bpf_sk_storage_get_tracing+0x2e/0x1b0 bpf_prog_5ea3e95db6da0438_tcp_retransmit_synack+0x1d20/0x1dda bpf_trace_run2+0x4c/0xc0 tcp_rtx_synack+0xf9/0x100 reqsk_timer_handler+0xda/0x3d0 run_timer_softirq+0x292/0x8a0 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 intel_idle_irq+0x5a/0xa0 cpuidle_enter_state+0x94/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb kfence-#1: 0x00000000a72cc7b6-0x00000000d97616d9, tamaño=2376, caché=TCPv6 asignado por la tarea 0 en la CPU 9 en 260507.901592s: sk_prot_alloc+0x35/0x140 sk_clone_lock+0x1f/0x3f0 inet_csk_clone_lock+0x15/0x160 tcp_create_openreq_child+0x1f/0x410 tcp_v6_syn_recv_sock+0x1da/0x700 tcp_check_req+0x1fb/0x510 tcp_v6_rcv+0x98b/0x1420 ipv6_list_rcv+0x2258/0x26e0 napi_complete_done+0x5b1/0x2990 mlx5e_napi_poll+0x2ae/0x8d0 net_rx_action+0x13e/0x590 irq_exit_rcu+0xf5/0x320 common_interrupt+0x80/0x90 asm_common_interrupt+0x22/0x40 cpuidle_enter_state+0xfb/0x273 cpu_startup_entry+0x15e/0x260 start_secondary+0x8a/0x90 secondary_startup_64_no_verify+0xfa/0xfb liberado por la tarea 0 en la CPU 9 a las 260507.927527 s: rcu_core_si+0x4ff/0xf10 irq_exit_rcu+0xf5/0x320 sysvec_apic_timer_interrupt+0x6d/0x80 asm_sysvec_apic_timer_interrupt+0x16/0x20 cpu_idle_entrada_estado+0xfb/0x273 cpu_inicio_entrada+0x15e/0x260 inicio_secundario+0x8a/0x90 inicio_secundario_64_sin_verificación+0xfa/0xfb"
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"lastModified": "2026-08-04T11:21:26.317",
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