Bug 2535072 (CVE-2026-89792)

Summary:	CVE-2026-89792 kernel: ksmbd: prevent out-of-bounds reads in share config responses
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	A flaw was found in ksmbd, a component of the Linux kernel. This vulnerability arises from insufficient validation of Inter-Process Communication (IPC) share configuration payload sizes, specifically during veto list parsing and path length derivation. An attacker could exploit this to trigger out-of-bounds reads, potentially leading to information disclosure.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-09-16 09:11:34 UTC

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

ksmbd: prevent out-of-bounds reads in share config responses

Validate IPC share configuration payload sizes before consuming
variable-length fields. Bound veto list parsing and account for
the separator byte when deriving the path length.

Comment 1 Keith Grant 2026-09-21 20:54:53 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89792.mbox