Bug 2535374 (CVE-2026-89859)

Summary:	CVE-2026-89859 kernel: scsi: qla2xxx: Zero dport diagnostics buffer to avoid info leak
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
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:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the `qla2xxx` SCSI driver within the Linux kernel. The `qla2x00_do_dport_diagnostics()` function allocates a diagnostics buffer without initializing all its fields. When this buffer is copied to user space, the uninitialized `options` and `unused[]` fields can leak sensitive kernel heap memory contents. A local attacker could exploit this vulnerability to obtain potentially confidential information.	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 2026-09-16 12:24:02 UTC

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

scsi: qla2xxx: Zero dport diagnostics buffer to avoid info leak

qla2x00_do_dport_diagnostics() allocates the qla_dport_diag response
buffer with kmalloc_obj() (non-zeroing) and, on success, copies the full
sizeof(*dd) back to user space via sg_copy_from_buffer(). The inbound
sg_copy_to_buffer() only fills as many bytes as the user request payload
provides, and qla26xx_dport_diagnostics() zeroes only dd->buf. The
options and unused[] fields are therefore copied out uninitialized,
leaking kernel heap contents to user space.

Allocate with kzalloc_obj(), matching qla2x00_do_dport_diagnostics_v2().

Comment 1 Keith Grant 2026-09-23 11:50:27 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89859.mbox