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Fencer Vulns
medium 5.3

CVE-2026-2100 json

P11-kit: null dereference via c_derivekey with specific null parameters

published 2026-03-26 7 mo ago modified 2026-11-05 3 d ago also EUVD-2026-16336

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

A flaw was found in p11-kit. A remote attacker could exploit this vulnerability by calling the C_DeriveKey function on a remote token with specific IBM kyber or IBM btc derive mechanism parameters set to NULL. This could lead to the RPC-client attempting to return an uninitialized value, potentially resulting in a NULL dereference or undefined behavior. This issue may cause an application level denial of service or other unpredictable system states.

Patch / fix

  • p11-glue p11-kit 0.26.2
  • Red Hat Red Hat Enterprise Linux 10 0:0.26.2-1.el10
  • Red Hat Red Hat Enterprise Linux 9 0:0.26.2-1.el9
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069, 1791371080, 1791788287, 1791970484
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076, 1791459707, 1791459711, 1791459759, 1791966259
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593
  • Red Hat Cost Management 4 1780946239
  • Red Hat Red Hat Hardened Images 0.26.2-1.1.hum1
  • Red Hat Red Hat Insights proxy 1.5 1780420428
  • Red Hat Red Hat Update Infrastructure 5 1779798159, 1779798164, 1779798165, 1779798222, 1787135742, 1787241211, 1787241260
  • p11-kit Debian 14 0.26.2-2

debian advisories DEBIAN-CVE-2026-2100

  • p11-kit RHEL 9 0.26.2-1.el9
  • p11-kit-trust RHEL 9 0.26.2-1.el9
  • p11-kit-client RHEL 9 0.26.2-1.el9
  • p11-kit-server RHEL 9 0.26.2-1.el9
  • p11-kit RHEL 10.2 0.26.2-1.el10
  • p11-kit-trust RHEL 10.2 0.26.2-1.el10
  • p11-kit-client RHEL 10.2 0.26.2-1.el10
  • p11-kit-server RHEL 10.2 0.26.2-1.el10

red hat advisories RHSA-2026:18599RHSA-2026:18143RHSA-2026:7065

  • p11-kit openSUSE Tumbleweed 0.26.2-1.1

opensuse advisories openSUSE-SU-2026:10169-1

  • p11-kit AlmaLinux 10 0.26.2-1.el10
  • p11-kit-trust AlmaLinux 10 0.26.2-1.el10
  • p11-kit-client AlmaLinux 10 0.26.2-1.el10
  • p11-kit-server AlmaLinux 10 0.26.2-1.el10
  • p11-kit AlmaLinux 9 0.26.2-1.el9
  • p11-kit-trust AlmaLinux 9 0.26.2-1.el9
  • p11-kit-client AlmaLinux 9 0.26.2-1.el9
  • p11-kit-server AlmaLinux 9 0.26.2-1.el9

almalinux advisories ALSA-2026:18143ALSA-2026:18599

  • p11-kit Rocky Linux 10 0.26.2-1.el10
  • p11-kit Rocky Linux 9 0.26.2-1.el9

rocky linux advisories RLSA-2026:18143RLSA-2026:18599

  • p11-kit Alpine 3.24, Alpine 3.23, Alpine 3.22 +1 more 0.26.2-r0

alpine advisories ALPINE-CVE-2026-2100

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-2100 updated cvss 5.3

p11-kit: NULL dereference via C_DeriveKey with specific NULL parameters

  • Red Hat OpenShift Container Platform 4 openshift4/ose-hypershift-rhel9
    under investigation
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82888
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-trust-manager-rhel9 1790598593
    fixed: vendor fix RHSA-2026:72502
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-rhel9-operator 1780946239
    fixed: vendor fix RHSA-2026:27998
  • Red Hat Enterprise Linux AppStream (v. 9) p11-kit-server 0.26.2-1.el9
    fixed: vendor fix RHSA-2026:18599
  • Red Hat Enterprise Linux AppStream (v. 10) p11-kit-server 0.26.2-1.el10
    fixed: vendor fix RHSA-2026:18143
  • Red Hat Enterprise Linux BaseOS (v. 9) p11-kit 0.26.2-1.el9, p11-kit-trust 0.26.2-1.el9, p11-kit-client 0.26.2-1.el9
    fixed: vendor fix RHSA-2026:18599
show 5 more
  • Red Hat Enterprise Linux BaseOS (v. 10) p11-kit 0.26.2-1.el10, p11-kit-trust 0.26.2-1.el10, p11-kit-client 0.26.2-1.el10
    fixed: vendor fix RHSA-2026:18143
  • Red Hat Hardened Images p11-kit 0.26.2-1.1.hum1, p11-kit-trust 0.26.2-1.1.hum1, p11-kit-client 0.26.2-1.1.hum1, p11-kit-server 0.26.2-1.1.hum1, mingw32-p11-kit 0.26.2-1.1.hum1, mingw64-p11-kit 0.26.2-1.1.hum1
    fixed: vendor fix RHSA-2026:7065
  • Red Hat Insights proxy 1.5 insights-proxy/insights-proxy-container-rhel9 1780420428
    fixed: vendor fix RHSA-2026:22634
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1779798159, rhui5/rhua-rhel9 1779798222, rhui5/haproxy-rhel9 1779798164, rhui5/rhua-tp-rhel9 1787241260, rhui5/installer-rhel9 1779798165, rhui5/installer-tp-rhel9 1787135742, +1 more
    fixed: vendor fix RHSA-2026:58981
  • Red Hat Cost Management 4 costmanagement/costmanagement-metrics-operator-bundle 1780989656 Red Hat Enterprise Linux 6 p11-kit, p11-kit-trust Red Hat Enterprise Linux 7 p11-kit, p11-kit-trust Red Hat Enterprise Linux 8 p11-kit, p11-kit-trust, p11-kit-server Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat Update Infrastructure 5 rhui5/cds-tp-rhel9 1787241206
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

1.31% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • p11-glue p11-kit
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20
  • Red Hat Cost Management 4
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Insights proxy 1.5
  • Red Hat Red Hat Update Infrastructure 5
  • 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 OpenShift Container Platform 4

Classification

Weakness
  • CWE-824 Access of Uninitialized Pointer

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.