Bug 2516413 (CVE-2026-72076)

Summary:	CVE-2026-72076 kernel: Input: ims-pcu - fix out-of-bounds read in ims_pcu_irq() debug logging
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:	rhel-process-autobot, 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's `ims-pcu` driver. The debug logging in the `ims_pcu_irq()` function can attempt to read data beyond the allocated buffer when processing certain Universal Serial Bus (USB) control requests. This out-of-bounds read occurs if the length of the control request exceeds the expected maximum input size. A local attacker could potentially use this flaw to cause a denial of service or disclose sensitive information from kernel memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:		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 2026-08-15 06:11:12 UTC

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

Input: ims-pcu - fix out-of-bounds read in ims_pcu_irq() debug logging

The debug logging in ims_pcu_irq() unconditionally prints data from
pcu->urb_in_buf. However, if the interrupt fired for pcu->urb_ctrl, the
actual data resides in pcu->urb_ctrl_buf. If urb->actual_length for the
control URB exceeds pcu->max_in_size, this leads to an out-of-bounds
read.

Fix this by printing from the correct buffer associated with the URB.

Comment 1 Keith Grant 2026-08-17 20:00:05 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081520-CVE-2026-72076-92c7@gregkh/T