SB20260907107 - Ubuntu update for p11-kit
Published: September 7, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Uncontrolled Recursion (CVE-ID: CVE-2026-13757)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the p11_rpc_message_get_attribute and p11_rpc_message_get_attribute_array_value functions when processing nested template attributes. A remote attacker can send a specially crafted request with deeply nested attributes via the RPC Unix domain socket to cause a denial of service.
Exploitation can lead to stack exhaustion and crash the server process.
2) Heap-based buffer overflow (CVE-ID: CVE-2026-18938)
CWE-ID: CWE-122 - Heap-based Buffer Overflow
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a heap-based buffer overflow in the p11-kit RPC parsing process when processing nested attributes in specially crafted messages. A local user can send specially crafted messages to cause a denial of service.
The vulnerability is only exploitable on 32-bit systems.
Remediation
Install update from vendor's website.