Bug 2536378 (CVE-2026-93160)

Summary:	CVE-2026-93160 kernel: crypto: atmel-ecc - reject hardware ECDH without a public key
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 Linux kernel's atmel-ecc cryptographic driver. The hardware Elliptic Curve Diffie-Hellman (ECDH) computation could use a private key that was not generated for the current cryptographic operation. This issue arises because the public key is only cached after a private key is successfully generated, and the `atmel_ecdh_compute_shared_secret()` function did not verify the presence of a cached public key. An attacker could potentially exploit this to cause incorrect cryptographic key exchanges, leading to a compromise of data confidentiality or integrity.	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 2026-09-17 17:35:39 UTC

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

crypto: atmel-ecc - reject hardware ECDH without a public key

The hardware ECDH path in atmel_ecdh_compute_shared_secret() uses the
private key stored in the device. However, the public key is cached only
after atmel_ecdh_set_secret() successfully generated that private key
for the current tfm.

atmel_ecdh_generate_public_key() already rejects requests when no public
key is cached. Add the same check to atmel_ecdh_compute_shared_secret()
to prevent the device from using a private key that was not generated
for the current tfm.

Comment 1 gkamathe 2026-09-18 22:18:43 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93160.mbox