CVE-2024-50257
Estado: ModificadaAlta (7.8)—
In the Linux kernel, the following vulnerability has been resolved:
netfilter: Fix use-after-free in get_info()
ip6table_nat module unload has refcnt warning for UAF. call trace is:
Concurrent execution of module unload and get_info() trigered the warning. The root cause is as follows:
cpu0 cpu1 module_exit //mod->state = MODULE_STATE_GOING ip6table_nat_exit xt_unregister_template kfree(t) //removed from templ_list getinfo() t = xt_find_table_lock list_for_each_entry(tmpl, &xt_templates[af]...) if (strcmp(tmpl->name, name)) continue; //table not found try_module_get list_for_each_entry(t, &xt_net->tables[af]...) return t; //not get refcnt module_put(t->me) //uaf unregister_pernet_subsys //remove table from xt_net list
Leer descripción completaMostrar menos
While xt_table module was going away and has been removed from xt_templates list, we couldnt get refcnt of xt_table->me. Check module in xt_net->tables list re-traversal to fix it.
Detalles técnicos trazas, registros y código del informe original
WARNING: CPU: 1 PID: 379 at kernel/module/main.c:853 module_put+0x6f/0x80 Modules linked in: ip6table_nat(-) CPU: 1 UID: 0 PID: 379 Comm: ip6tables Not tainted 6.12.0-rc4-00047-gc2ee9f594da8-dirty #205 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:module_put+0x6f/0x80 Call Trace: <TASK> get_info+0x128/0x180 do_ip6t_get_ctl+0x6a/0x430 nf_getsockopt+0x46/0x80 ipv6_getsockopt+0xb9/0x100 rawv6_getsockopt+0x42/0x190 do_sock_getsockopt+0xaa/0x180 __sys_getsockopt+0x70/0xc0 __x64_sys_getsockopt+0x20/0x30 do_syscall_64+0xa2/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.26%
- Percentil entre todas las CVEs puntuadas: 16
- 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 escalation85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 %
Use-after-free (CWE-416) con acceso local sin interacción (AV:L/PR:L/UI:N) permite escalada; impacto: ejecución de código arbitrario.
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/6a1f088f9807f5166f58902d26246d0b88da03a8
- https://git.kernel.org/stable/c/ba22ea01348384df19cc1fabc7964be6e7189749
- https://git.kernel.org/stable/c/bab3bb35c03b263c486833d50d50c081d9e9832b
- https://git.kernel.org/stable/c/cb7c388b5967946f097afdb759b7c860305f2d96
- https://git.kernel.org/stable/c/f48d258f0ac540f00fa617dac496c4c18b5dc2fa
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: Fix use-after-free in get_info()\n\nip6table_nat module unload has refcnt warning for UAF. call trace is:\n\nWARNING: CPU: 1 PID: 379 at kernel/module/main.c:853 module_put+0x6f/0x80\nModules linked in: ip6table_nat(-)\nCPU: 1 UID: 0 PID: 379 Comm: ip6tables Not tainted 6.12.0-rc4-00047-gc2ee9f594da8-dirty #205\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996),\nBIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\nRIP: 0010:module_put+0x6f/0x80\nCall Trace:\n <TASK>\n get_info+0x128/0x180\n do_ip6t_get_ctl+0x6a/0x430\n nf_getsockopt+0x46/0x80\n ipv6_getsockopt+0xb9/0x100\n rawv6_getsockopt+0x42/0x190\n do_sock_getsockopt+0xaa/0x180\n __sys_getsockopt+0x70/0xc0\n __x64_sys_getsockopt+0x20/0x30\n do_syscall_64+0xa2/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nConcurrent execution of module unload and get_info() trigered the warning.\nThe root cause is as follows:\n\ncpu0\t\t\t\t cpu1\nmodule_exit\n//mod->state = MODULE_STATE_GOING\n ip6table_nat_exit\n xt_unregister_template\n\tkfree(t)\n\t//removed from templ_list\n\t\t\t\t getinfo()\n\t\t\t\t\t t = xt_find_table_lock\n\t\t\t\t\t\tlist_for_each_entry(tmpl, &xt_templates[af]...)\n\t\t\t\t\t\t\tif (strcmp(tmpl->name, name))\n\t\t\t\t\t\t\t\tcontinue; //table not found\n\t\t\t\t\t\t\ttry_module_get\n\t\t\t\t\t\tlist_for_each_entry(t, &xt_net->tables[af]...)\n\t\t\t\t\t\t\treturn t; //not get refcnt\n\t\t\t\t\t module_put(t->me) //uaf\n unregister_pernet_subsys\n //remove table from xt_net list\n\nWhile xt_table module was going away and has been removed from\nxt_templates list, we couldnt get refcnt of xt_table->me. Check\nmodule in xt_net->tables list re-traversal to fix it."
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: Se corrige el problema use-after-free en la descarga del módulo ip6table_nat get_info() que tiene una advertencia refcnt para UAF. El seguimiento de llamadas es: ADVERTENCIA: CPU: 1 PID: 379 en kernel/module/main.c:853 module_put+0x6f/0x80 Módulos vinculados en: ip6table_nat(-) CPU: 1 UID: 0 PID: 379 Comm: ip6tables No contaminado 6.12.0-rc4-00047-gc2ee9f594da8-dirty #205 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:module_put+0x6f/0x80 Seguimiento de llamadas: get_info+0x128/0x180 La ejecución simultánea de la descarga del módulo y get_info() activó la advertencia. La causa raíz es la siguiente: cpu0 cpu1 module_exit //mod->state = MODULE_STATE_GOING ip6table_nat_exit xt_unregister_template kfree(t) //eliminado de la lista de plantillas getinfo() t = xt_find_table_lock list_for_each_entry(tmpl, &xt_templates[af]...) if (strcmp(tmpl->name, name)) continue; //tabla no encontrada try_module_get list_for_each_entry(t, &xt_net->tables[af]...) return t; //no obtener refcnt module_put(t->me) //uaf unregister_pernet_subsys //eliminar tabla de la lista xt_net Mientras el módulo xt_table desaparecía y se eliminaba de la lista xt_templates, no pudimos obtener refcnt de xt_table->me. Verifique el módulo en el recorrido de lista xt_net->tables para solucionarlo."
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