Bug 2546431 (CVE-2026-98221)

Summary:	CVE-2026-98221 kernel: KEYS: trusted: Fix tpm2_load_cmd() boundary check
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 the Linux kernel's trusted keys subsystem. A local user can exploit this vulnerability by submitting a specially crafted trusted key payload. Because the kernel validates boundaries against the encoded data length rather than the decoded buffer size, an out-of-bounds memory read can occur. This issue can lead to a system crash, resulting in a denial of service (DoS), or potentially expose sensitive kernel memory.	Story Points:	---
Clone Of:		Environment:
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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 2026-10-06 09:19:49 UTC

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

KEYS: trusted: Fix tpm2_load_cmd() boundary check

tpm2_load_cmd() does boundary checks against the ASN.1 size i.e.,
payload->blob_len. Address this by passing the decoded blob size to
tpm2_load_cmd(), and use it for the boundary checks.

Comment 1 Mauro Matteo Cascella 2026-10-09 11:50:48 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98221.mbox