Bug 2507407 (CVE-2026-17523)

Summary:	CVE-2026-17523 kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	rhel-process-autobot, rkeshri, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	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.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-07-27 08:03:21 UTC

can: bcm: switch timer to HRTIMER_MODE_SOFT and remove hrtimer_tasklet
commit bf74aa86e111aa3b2fbb25db37e3a3fab71b5b68

This patch switches the timer to HRTIMER_MODE_SOFT, which executed the
timer callback in softirq context and removes the hrtimer_tasklet.

Comment 6 errata-xmlrpc 2026-08-17 15:30:10 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55765 https://access.redhat.com/errata/RHSA-2026:55765

Comment 7 errata-xmlrpc 2026-08-17 16:51:21 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:55764 https://access.redhat.com/errata/RHSA-2026:55764

Comment 8 errata-xmlrpc 2026-09-01 09:29:07 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:61932 https://access.redhat.com/errata/RHSA-2026:61932