CVE-2026-2100

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

HIGH
7.5
CVSS Score
Published: March 26, 2026 at 08:01 PM UTC
Updated: October 29, 2026 at 02:13 PM UTC
9 products affected across 3 vendorsEnterprise LinuxHardened ImagesUpdate Infrastructure

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

1.17.0 ≤ v < 1.17.21.18.0 ≤ v < 1.18.21.20.0 ≤ v < 1.20.1
Vendor states this is fixed in 0:0.26.2-1.el10 (unaffected)
Vendor states this is fixed in 0:0.26.2-1.el9 (unaffected)
Vendor states this is fixed in 6 (unaffected)
Vendor states this is fixed in 7 (unaffected)
Vendor states this is fixed in 8 (unaffected)
All versions1
Vendor states this is fixed in 0.26.2-1.1.hum1 (unaffected)
Vendor states this is fixed in 1780420428 (unaffected)
Vendor states this is fixed in 1779798159 (unaffected)
Vendor states this is fixed in 1779798164 (unaffected)
Vendor states this is fixed in 1779798165 (unaffected)
Vendor states this is fixed in 1779798222 (unaffected)
Vendor states this is fixed in 1787135742 (unaffected)
Vendor states this is fixed in 1787241211 (unaffected)
Vendor states this is fixed in 1787241260 (unaffected)
Affected range stops below 0.26.2, so it looks safe — our inference, not a vendor statement
All versions
Vendor states this is fixed in 4 (unaffected)
Vendor states this is fixed in 4 (unknown)

References (19)

VDB Entryx_refsource_REDHATVendor Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-2100
Issue Trackingx_refsource_REDHATVendor Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2437308
Issue TrackingPatch
Source: cverecord
https://github.com/p11-glue/p11-kit/pull/740
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:7065
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:18143
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:18599
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:21275
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:22634

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-824

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