Description
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.
Published: 2026-07-27
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

A kernel flaw allows an unprivileged local user to execute arbitrary code in the kernel, resulting in local privilege escalation. The attacker can gain root privileges and full control over the affected system. This weakness is categorized as CWE‑825, indicating that operations are not properly restricted within the bounds of a resource.

Affected Systems

The vulnerability affects Red Hat Enterprise Linux releases 6, 7, 8, 9, and 10. No specific kernel minor versions are listed, so all kernel variants within these distributions are potentially impacted.

Risk and Exploitability

The CVSS score of 7.8 reflects moderate to high impact. The EPSS score of <1% indicates a very low probability of exploitation, and the flaw is not listed in the CISA KEV catalog. The attack requires local, unprivileged user access and does not rely on network-based exploitation. Once exploited, the user can elevate to root and run arbitrary code. Given its local nature, the risk is primarily for systems with easy local access or compromised user accounts.

Generated by OpenCVE AI on August 3, 2026 at 17:56 UTC.

Remediation

Vendor Workaround

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.


OpenCVE Recommended Actions

  • Apply the RHEL kernel update that fixes CVE‑2026‑17523.
  • If the patch is not yet available for your RHEL version, restrict local user privileges by removing them from the wheel or sudoers group until a fix is released.
  • Enable kernel module signing enforcement to prevent unauthorized module loading, which may mitigate the vulnerability.
  • Monitor system logs for attempts to exploit kernel components and verify that the vulnerability is not being abused.

Generated by OpenCVE AI on August 3, 2026 at 17:56 UTC.

Tracking

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Advisories

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History

Wed, 29 Jul 2026 10:30:00 +0000

Type Values Removed Values Added
Description 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. 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.

Mon, 27 Jul 2026 15:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Vendors & Products Linux
Linux linux Kernel

Mon, 27 Jul 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 27 Jul 2026 10:15:00 +0000

Type Values Removed Values Added
Description 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.
Title Kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-825
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Subscriptions

Linux Linux Kernel
Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-08-05T17:29:26.681Z

Reserved: 2026-07-27T08:19:11.242Z

Link: CVE-2026-17523

cve-icon Vulnrichment

Updated: 2026-07-27T13:44:29.321Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-07-27T10:16:36.270

Modified: 2026-07-29T11:16:48.620

Link: CVE-2026-17523

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-03T18:00:11Z

Weaknesses
  • CWE-825

    Expired Pointer Dereference