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Advisory severityHigh7.8Red Hat Linux

High [CVE-2026-17523] can:bcm: arbitrary kernel code execution leading to escalate privileges

This high-severity Red Hat Linux advisory covers CVE-2026-17523 affecting Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-17523 Source published Source updated

VulniPulse record published

CVE-2026-17523
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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.

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. Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-825.

Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions.

Affected products named by the advisory: Red Hat package: kernel-rt.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Fixed versions
  • kernel-rt-0:4.18.0-553.156.1.rt7.497.el8_10
  • kernel-0:4.18.0-553.156.1.el8_10
  • kernel-0:4.18.0-305.206.1.el8_4
  • kernel-0:4.18.0-372.213.1.el8_6
  • kernel-0:4.18.0-477.163.1.el8_8
  • RHSA-2026:55765
  • RHSA-2026:55764
  • RHSA-2026:65710
  • RHSA-2026:65711
  • RHSA-2026:61932

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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.

Official advisory · high-confidence parse· fetched 28 days ago·verify at source

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