CVE-2025-38126
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping
The stmmac platform drivers that do not open-code the clk_ptp_rate value after having retrieved the default one from the device-tree can end up with 0 in clk_ptp_rate (as clk_get_rate can return 0). It will eventually propagate up to PTP initialization when bringing up the interface, leading to a divide by 0:
Prevent this division by 0 by adding an explicit check and error log about the actual issue. While at it, remove the same check from stmmac_ptp_register, which then becomes duplicate
Detalles técnicos trazas, registros y código del informe original
Division by zero in kernel. CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.30-00001-g48313bd5768a #22 Hardware name: STM32 (Device Tree Support) Call trace: unwind_backtrace from show_stack+0x18/0x1c show_stack from dump_stack_lvl+0x6c/0x8c dump_stack_lvl from Ldiv0_64+0x8/0x18 Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4 stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c stmmac_hw_setup from __stmmac_open+0x18c/0x434 __stmmac_open from stmmac_open+0x3c/0xbc stmmac_open from __dev_open+0xf4/0x1ac __dev_open from __dev_change_flags+0x1cc/0x224 __dev_change_flags from dev_change_flags+0x24/0x60 dev_change_flags from ip_auto_config+0x2e8/0x11a0 ip_auto_config from do_one_initcall+0x84/0x33c do_one_initcall from kernel_init_freeable+0x1b8/0x214 kernel_init_freeable from kernel_init+0x24/0x140 kernel_init from ret_from_fork+0x14/0x28 Exception stack(0xe0815fb0 to 0xe0815ff8)
CVSS
- 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: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- 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 (2)
CWE
- CWE-369
Referencias
- https://git.kernel.org/stable/c/030ce919e114a111e83b7976ecb3597cefd33f26
- https://git.kernel.org/stable/c/32af9c289234990752281c805500dfe03c5b2b8f
- https://git.kernel.org/stable/c/379cd990dfe752b38fcf46034698a9a150626c7a
- https://git.kernel.org/stable/c/b263088ee8ab14563817a8be3519af8e25225793
- https://git.kernel.org/stable/c/bb033c6781ce1b0264c3993b767b4aa9021959c2
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
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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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: stmmac: make sure that ptp_rate is not 0 before configuring timestamping\n\nThe stmmac platform drivers that do not open-code the clk_ptp_rate value\nafter having retrieved the default one from the device-tree can end up\nwith 0 in clk_ptp_rate (as clk_get_rate can return 0). It will\neventually propagate up to PTP initialization when bringing up the\ninterface, leading to a divide by 0:\n\n Division by zero in kernel.\n CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.30-00001-g48313bd5768a #22\n Hardware name: STM32 (Device Tree Support)\n Call trace:\n unwind_backtrace from show_stack+0x18/0x1c\n show_stack from dump_stack_lvl+0x6c/0x8c\n dump_stack_lvl from Ldiv0_64+0x8/0x18\n Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4\n stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c\n stmmac_hw_setup from __stmmac_open+0x18c/0x434\n __stmmac_open from stmmac_open+0x3c/0xbc\n stmmac_open from __dev_open+0xf4/0x1ac\n __dev_open from __dev_change_flags+0x1cc/0x224\n __dev_change_flags from dev_change_flags+0x24/0x60\n dev_change_flags from ip_auto_config+0x2e8/0x11a0\n ip_auto_config from do_one_initcall+0x84/0x33c\n do_one_initcall from kernel_init_freeable+0x1b8/0x214\n kernel_init_freeable from kernel_init+0x24/0x140\n kernel_init from ret_from_fork+0x14/0x28\n Exception stack(0xe0815fb0 to 0xe0815ff8)\n\nPrevent this division by 0 by adding an explicit check and error log\nabout the actual issue. While at it, remove the same check from\nstmmac_ptp_register, which then becomes duplicate"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: stmmac: asegúrese de que ptp_rate no sea 0 antes de configurar el sellado de tiempo. Los controladores de la plataforma stmmac que no incluyen en código abierto el valor clk_ptp_rate tras obtener el predeterminado del árbol de dispositivos pueden terminar con 0 en clk_ptp_rate (ya que clk_get_rate puede devolver 0). Esto se propagará hasta la inicialización de PTP al iniciar la interfaz, lo que provocará una división por 0: División por cero en el kernel. CPU: 1 UID: 0 PID: 1 Comm: swapper/0 No contaminado 6.12.30-00001-g48313bd5768a #22 Nombre del hardware: STM32 (Compatibilidad con árbol de dispositivos) Rastreo de llamadas: unwind_backtrace from show_stack+0x18/0x1c show_stack from dump_stack_lvl+0x6c/0x8c dump_stack_lvl from Ldiv0_64+0x8/0x18 Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4 stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c stmmac_hw_setup from __stmmac_open+0x18c/0x434 __stmmac_open from stmmac_open+0x3c/0xbc stmmac_open from __dev_open+0xf4/0x1ac __dev_open from __dev_change_flags+0x1cc/0x224 __dev_change_flags from dev_change_flags+0x24/0x60 dev_change_flags from ip_auto_config+0x2e8/0x11a0 ip_auto_config from do_one_initcall+0x84/0x33c do_one_initcall from kernel_init_freeable+0x1b8/0x214 kernel_init_freeable from kernel_init+0x24/0x140 kernel_init from ret_from_fork+0x14/0x28 Exception stack(0xe0815fb0 to 0xe0815ff8) Evite esta división por 0 sumando Una comprobación explícita y un registro de errores sobre el problema. Mientras tanto, elimine la misma comprobación de stmmac_ptp_register, que se convierte en un duplicado."
}
],
"lastModified": "2026-06-17T09:16:06.540",
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