[USN-8686-1] openCryptoki vulnerabilities

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-8686-1
August 27, 2026

opencryptoki vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in openCryptoki.

Software Description:
- opencryptoki: A PKCS#11 Cryptographic Token Interface Standard implementation.

Details:

It was discovered that primitive decoders in openCryptoki produced integer
underflows when the encoded length was zero. An attacker could possibly use
this issue to trigger out-of-bounds reads. (CVE-2026-40253)

It was discovered that openCryptoki incorrectly handled symlinks. An
attacker in the token-group could possibly use this issue to achieve
privilege  escalation or access sensitive information. (CVE-2026-23893)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  libopencryptoki-dev             3.23.0+dfsg-0ubuntu3.1
  libopencryptoki0                3.23.0+dfsg-0ubuntu3.1
  opencryptoki                    3.23.0+dfsg-0ubuntu3.1

Ubuntu 22.04 LTS
  libopencryptoki-dev             3.17.0+dfsg+20220202.b40982e-0ubuntu1.3
  libopencryptoki0                3.17.0+dfsg+20220202.b40982e-0ubuntu1.3
  opencryptoki                    3.17.0+dfsg+20220202.b40982e-0ubuntu1.3

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8686-1
  CVE-2026-23893, CVE-2026-40253

Package Information:
  https://launchpad.net/ubuntu/+source/opencryptoki/3.23.0+dfsg-0ubuntu3.1
  https://launchpad.net/ubuntu/+source/opencryptoki/3.17.0+dfsg+20220202.b40982e-0ubuntu1.3
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: OpenPGP digital signature
URL: <https://lists.ubuntu.com/archives/ubuntu-security-announce/attachments/20260827/e5fe782e/attachment.sig>