Bug 2482041 (CVE-2026-45871)

Summary:	CVE-2026-45871 kernel: tpm: st33zp24: Fix missing cleanup on get_burstcount() error
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
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Trusted Platform Module (TPM) subsystem. When the get_burstcount() function encounters an error, the st33zp24 driver fails to release a previously acquired resource. This oversight can lead to resource exhaustion, potentially allowing a local attacker to cause a Denial of Service (DoS) by making the TPM device unavailable.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
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 15:08:25 UTC

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

tpm: st33zp24: Fix missing cleanup on get_burstcount() error

get_burstcount() can return -EBUSY on timeout. When this happens,
st33zp24_send() returns directly without releasing the locality
acquired earlier.

Use goto out_err to ensure proper cleanup when get_burstcount() fails.

Comment 1 Keith Grant 2026-05-28 03:43:20 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052713-CVE-2026-45871-f848@gregkh/T