Description
A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | p11-kit | 0.26.5-1 | — |
| Debian 13 | p11-kit | No fix yet | — |
| Debian 12 | p11-kit | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | p11-kit | No fix yet | — |
| Ubuntu 24.04 LTS | p11-kit | 0.25.3-4ubuntu2.2 | USN-8687-1 |
| Ubuntu 22.04 LTS | p11-kit | 0.24.0-6ubuntu0.1 | USN-8687-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | p11-kit | 0.23.20-1ubuntu0.1+esm1 | USN-8687-1 |
| Ubuntu Pro 18.04 LTS | p11-kit | 0.23.9-2ubuntu0.1+esm1 | USN-8687-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | p11-kit | 0.25.5-160000.3.1 | SUSE-SU-2026:24255-1 |
| SLES 16.0 | p11-kit | 0.25.5-160000.3.1 | SUSE-SU-2026:24255-1 |
| SLE Micro 6.2 | p11-kit | 0.25.5-160000.3.1 | SUSE-SU-2026:24193-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | p11-kit | 0.26.5-1.1 | openSUSE-SU-2026:11862-1 |
| openSUSE Leap 16.0 | p11-kit | 0.25.5-160000.3.1 | openSUSE-SU-2026:22105-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | p11-kit +3 | 0.23.22-1.amzn2.0.2 | ALAS2-2026-4084 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | p11-kit | 0.26.5-1 | — |
Advisories 6
- ALAS2-2026-4084 Moderate: p11-kit security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 9, 2026
- SUSE-SU-2026:24255-1 Security update for p11-kit SUSE / openSUSE Security Updates · Oct 23, 2026
- SUSE-SU-2026:24193-1 Security update for p11-kit SUSE / openSUSE Security Updates · Oct 21, 2026
- openSUSE-SU-2026:22105-1 Security update for p11-kit SUSE / openSUSE Security Updates · Oct 19, 2026
- openSUSE-SU-2026:11862-1 libp11-kit0-0.26.5-1.1 on GA media SUSE / openSUSE Security Updates · Sep 24, 2026
- USN-8687-1 p11-kit vulnerabilities Ubuntu Security Notices (USN) · Aug 31, 2026
References
- https://access.redhat.com/security/cve/CVE-2026-18938 vdb-entry
- RHBZ#2478995 issue-tracking