CVE-2022-49395
Estado: ModificadaAlta (7.1)—
In the Linux kernel, the following vulnerability has been resolved:
um: Fix out-of-bounds read in LDT setup
syscall_stub_data() expects the data_count parameter to be the number of longs, not bytes.
Detalles técnicos trazas, registros y código del informe original
================================================================== BUG: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0 Read of size 128 at addr 000000006411f6f0 by task swapper/1 CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18 Call Trace: show_stack.cold+0x166/0x2a7 __dump_stack+0x3a/0x43 dump_stack_lvl+0x1f/0x27 print_report.cold+0xdb/0xf81 kasan_report+0x119/0x1f0 kasan_check_range+0x3a3/0x440 memcpy+0x52/0x140 syscall_stub_data+0x70/0xe0 write_ldt_entry+0xac/0x190 init_new_ldt+0x515/0x960 init_new_context+0x2c4/0x4d0 mm_init.constprop.0+0x5ed/0x760 mm_alloc+0x118/0x170 0x60033f48 do_one_initcall+0x1d7/0x860 0x60003e7b kernel_init+0x6e/0x3d4 new_thread_handler+0x1e7/0x2c0 The buggy address belongs to stack of task swapper/1 and is located at offset 64 in frame: init_new_ldt+0x0/0x960 This frame has 2 objects: [32, 40) 'addr' [64, 80) 'desc' ==================================================================
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- Puntuación base: 7.1
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.29%
- Percentil entre todas las CVEs puntuadas: 20
- Fecha de la puntuación: 5/10/2026
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 Interpreterexecution60 % - Impacto secundario
T1499.004Application or System Exploitationimpact55 %
AV:L/PR:L sin UI permite escalada local (T1068). El out-of-bounds read en LDT puede permitir ejecución de código (T1059) o denegación de servicio (T1499.004); la ejecución es menos segura que el DoS.
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-125
- CWE-125
Referencias
- https://git.kernel.org/stable/c/10995a382271254bd276627ec74136da4a23c4a6
- https://git.kernel.org/stable/c/24ca648bf5f72ed8878cf09b5d4431935779681e
- https://git.kernel.org/stable/c/2a4a62a14be1947fa945c5c11ebf67326381a568
- https://git.kernel.org/stable/c/3549ab4b962cf619e8c55484a0d870a34b3f845f
- https://git.kernel.org/stable/c/668ca34a428d6ffc0f99a1a6a9b661a288d4183b
- https://git.kernel.org/stable/c/91e5ba2af2d729d5126aefd5aa3eadc69b8426e5
- https://git.kernel.org/stable/c/9caad70819aef3431abaf73ba5163b55b161aba0
- https://git.kernel.org/stable/c/cf0dabc37446c5ee538ae7b4c467ab0e53fa5463
- https://git.kernel.org/stable/c/ef1dc929a1e5fa1b2d842256db9fb8710d3be910
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\num: Fix out-of-bounds read in LDT setup\n\nsyscall_stub_data() expects the data_count parameter to be the number of\nlongs, not bytes.\n\n ==================================================================\n BUG: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0\n Read of size 128 at addr 000000006411f6f0 by task swapper/1\n\n CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18\n Call Trace:\n show_stack.cold+0x166/0x2a7\n __dump_stack+0x3a/0x43\n dump_stack_lvl+0x1f/0x27\n print_report.cold+0xdb/0xf81\n kasan_report+0x119/0x1f0\n kasan_check_range+0x3a3/0x440\n memcpy+0x52/0x140\n syscall_stub_data+0x70/0xe0\n write_ldt_entry+0xac/0x190\n init_new_ldt+0x515/0x960\n init_new_context+0x2c4/0x4d0\n mm_init.constprop.0+0x5ed/0x760\n mm_alloc+0x118/0x170\n 0x60033f48\n do_one_initcall+0x1d7/0x860\n 0x60003e7b\n kernel_init+0x6e/0x3d4\n new_thread_handler+0x1e7/0x2c0\n\n The buggy address belongs to stack of task swapper/1\n and is located at offset 64 in frame:\n init_new_ldt+0x0/0x960\n\n This frame has 2 objects:\n [32, 40) 'addr'\n [64, 80) 'desc'\n =================================================================="
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: um: Se corrige la lectura fuera de los límites en la configuración de LDT syscall_stub_data() espera que el parámetro data_count sea el número de longs, no bytes. ===================================================================== ERROR: KASAN: stack-out-of-bounds in syscall_stub_data+0x70/0xe0 Read of size 128 at addr 000000006411f6f0 by task swapper/1 CPU: 0 PID: 1 Comm: swapper Not tainted 5.18.0+ #18 Call Trace: show_stack.cold+0x166/0x2a7 __dump_stack+0x3a/0x43 dump_stack_lvl+0x1f/0x27 print_report.cold+0xdb/0xf81 kasan_report+0x119/0x1f0 kasan_check_range+0x3a3/0x440 memcpy+0x52/0x140 syscall_stub_data+0x70/0xe0 write_ldt_entry+0xac/0x190 init_new_ldt+0x515/0x960 init_new_context+0x2c4/0x4d0 mm_init.constprop.0+0x5ed/0x760 mm_alloc+0x118/0x170 0x60033f48 do_one_initcall+0x1d7/0x860 0x60003e7b kernel_init+0x6e/0x3d4 new_thread_handler+0x1e7/0x2c0 The buggy address belongs to stack of task swapper/1 and is located at offset 64 in frame: init_new_ldt+0x0/0x960 This frame has 2 objects: [32, 40) 'addr' [64, 80) 'desc' =================================================================="
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"lastModified": "2026-06-17T05:17:55.690",
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