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RHEL 9 : opencryptoki (RHSA-2026:28256)

medium Nessus Plugin ID 322309

Synopsis

The remote Red Hat host is missing a security update for opencryptoki.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:28256 advisory.

 The opencryptoki packages contain version 2.11 of the PKCS#11 API, implemented for IBM Cryptocards, such as IBM 4764 and 4765 crypto cards. These packages includes support for the IBM 4758 Cryptographic CoProcessor (with the PKCS#11 firmware loaded), the IBM eServer Cryptographic Accelerator (FC 4960 on IBM eServer System p), the IBM Crypto Express2 (FC 0863 or FC 0870 on IBM System z), and the IBM CP Assist for Cryptographic Function (FC 3863 on IBM System z). The opencryptoki packages also bring a software token implementation that can be used without any cryptographic hardware. These packages contain the Slot Daemon (pkcsslotd) and general utilities.

 Security Fix(es):

 * openCryptoki: openCryptoki: Information disclosure and Denial of Service via malformed BER-encoded cryptographic objects (CVE-2026-40253)

 For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL opencryptoki package based on the guidance in RHSA-2026:28256.

See Also

https://access.redhat.com/errata/RHSA-2026:28256

https://access.redhat.com/security/updates/classification/#moderate

https://bugzilla.redhat.com/show_bug.cgi?id=2459076

http://www.nessus.org/u?305fc7f9

Plugin Details

Severity: Medium

ID: 322309

File Name: redhat-RHSA-2026-28256.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/24/2026

Updated: 6/24/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.0

Vendor

Vendor Severity: Moderate

CVSS v2

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.4

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:C

CVSS Score Source: CVE-2026-40253

CVSS v3

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 5.5

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:opencryptoki-libs, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:opencryptoki-devel, p-cpe:/a:redhat:enterprise_linux:opencryptoki-icsftok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-swtok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-ep11tok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-ccatok, p-cpe:/a:redhat:enterprise_linux:opencryptoki-icatok, cpe:/o:redhat:rhel_eus:9.8, p-cpe:/a:redhat:enterprise_linux:opencryptoki

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/23/2026

Vulnerability Publication Date: 4/16/2026

Reference Information

CVE: CVE-2026-40253

CWE: 125

RHSA: 2026:28256