Bug 2481991 (CVE-2026-45993)

Summary:	CVE-2026-45993 kernel: LoongArch: Add spectre boundry for syscall dispatch table
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
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, specifically affecting the LoongArch architecture. The system call (syscall) dispatch table, which handles requests from user programs, does not properly validate the syscall number provided by userspace. This missing boundary check could allow a local attacker to access memory outside the intended syscall function pointer tables, potentially leading to information disclosure.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-27 15:05:58 UTC

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

LoongArch: Add spectre boundry for syscall dispatch table

The LoongArch syscall number is directly controlled by userspace, but
does not have a array_index_nospec() boundry to prevent access past the
syscall function pointer tables.

Comment 1 Keith Grant 2026-05-27 21:43:17 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052740-CVE-2026-45993-3e54@gregkh/T