Bug 2486432 (CVE-2026-46302)

Summary:	CVE-2026-46302 kernel: selinux: allow multiple opens of /sys/fs/selinux/policy
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Security-Enhanced Linux (SELinux) policy handling. A local attacker could exploit this by opening the /sys/fs/selinux/policy file, which prevents other processes from accessing or reading the kernel's security policy. This could lead to a denial of service (DoS) for other system processes that rely on reading the SELinux policy.	Story Points:	---
Clone Of:		Environment:
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Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-06-08 17:01:34 UTC

In the Linux kernel, the following vulnerability has been resolved:

selinux: allow multiple opens of /sys/fs/selinux/policy

Currently there can only be a single open of /sys/fs/selinux/policy at
any time. This allows any process to block any other process from
reading the kernel policy. The original motivation seems to have been
a mix of preventing an inconsistent view of the policy size and
preventing userspace from allocating kernel memory without bound, but
this is arguably equally bad. Eliminate the policy_opened flag and
shrink the critical section that the policy mutex is held. While we
are making changes here, drop a couple of extraneous BUG_ONs.

Comment 1 Keith Grant 2026-06-08 18:54:02 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060859-CVE-2026-46302-fd95@gregkh/T