Описание
A flaw was found in the Linux kernel in net/can/bcm.c in can: bcm, where an unprivileged local user can exploit this vulnerability to execute arbitrary code within the kernel, which leads to a local privilege escalation (LPE). This allows the attacker to gain root privileges and take full control of the affected system.
Отчет
This is an Important flaw in the Linux kernel's CAN BCM module that allows a local unprivileged attacker to achieve root privileges through arbitrary kernel code execution. The vulnerability is present in Red Hat Enterprise Linux 8, where a proof of concept has demonstrated local privilege escalation, even without unprivileged user namespaces or the kernel-modules-extra package.
Меры по смягчению последствий
To mitigate this vulnerability, prevent the bcm kernel module from loading if it is not required. Create a file named /etc/modprobe.d/blacklist-bcm.conf with the content blacklist bcm. A system reboot is required for this change to take effect. This mitigation may impact functionality that relies on the CAN BCM module.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | ||
| Red Hat Enterprise Linux 6 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel | Not affected | ||
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel | Not affected | ||
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | ||
| Red Hat Enterprise Linux 8 | kernel-rt | Fixed | RHSA-2026:55765 | 17.08.2026 |
| Red Hat Enterprise Linux 8 | kernel | Fixed | RHSA-2026:55764 | 17.08.2026 |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | kernel | Fixed | RHSA-2026:65710 | 09.09.2026 |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | kernel | Fixed | RHSA-2026:65710 | 09.09.2026 |
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Дополнительная информация
Статус:
EPSS
7.8 High
CVSS3
Связанные уязвимости
In the Linux kernel, the following vulnerability has been resolved: can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet This patch switches the timer to HRTIMER_MODE_SOFT, which executed the timer callback in softirq context and removes the hrtimer_tasklet.
In the Linux kernel, the following vulnerability has been resolved: can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet This patch switches the timer to HRTIMER_MODE_SOFT, which executed the timer callback in softirq context and removes the hrtimer_tasklet.
In the Linux kernel, the following vulnerability has been resolved: c ...
A flaw was found in the kernel. An unprivileged local user can exploit this vulnerability to execute arbitrary code within the kernel, which leads to a local privilege escalation (LPE). This allows the attacker to gain root privileges and take full control of the affected system.
EPSS
7.8 High
CVSS3