SB2026082869 - Ubuntu update for opencryptoki
Published: August 28, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Out-of-bounds read (CVE-ID: CVE-2026-40253)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to disclose sensitive information and cause a denial of service.
The vulnerability exists due to out-of-bounds read in BER/DER decoding functions in usr/lib/common/asn1.c when parsing malformed BER-encoded cryptographic objects with attacker-controlled length fields. A remote attacker can supply a specially crafted key or certificate to disclose sensitive information and cause a denial of service.
The issue affects the shared common library and impacts all token backends, including Soft, ICA, CCA, TPM, EP11, and ICSF.
2) Link following (CVE-ID: CVE-2026-23893)
CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to an insecure link following issue. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with root privileges when an administrator runs a PKCS#11 application.
Remediation
Install update from vendor's website.