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.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:18599 advisory.

    The p11-kit packages provide a mechanism to manage PKCS#11 modules. The p11-kit-trust subpackage includes     a PKCS#11 trust module that provides certificate anchors and black lists based on configuration files.

    Security Fix(es):

    * p11-kit: p11-kit: NULL dereference via C_DeriveKey with specific NULL parameters (CVE-2026-2100)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Redhat Enterprise Linux 10 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:18143 advisory.

    The p11-kit packages provide a mechanism to manage PKCS#11 modules. The p11-kit-trust subpackage includes     a PKCS#11 trust module that provides certificate anchors and black lists based on configuration files.

    Security Fix(es):

    * p11-kit: p11-kit: NULL dereference via C_DeriveKey with specific NULL parameters (CVE-2026-2100)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

    Additional Changes:

    For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes     linked from the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-7982f70f74 advisory.

    Notable changes from the rebase:
    * pkcs11: Update PKCS11 headers to version 3.2
    * rpc: fix NULL dereference via C_DeriveKey with specific NULL parameters (CVE-2026-2100)
    * trust: Lookup DNs in reverse order (RFC4514 section 2.1)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-f1fabb2a49 advisory.

    Notable changes from the rebase:
    * pkcs11: Update PKCS11 headers to version 3.2
    * rpc: fix NULL dereference via C_DeriveKey with specific NULL parameters (CVE-2026-2100)
    * trust: Lookup DNs in reverse order (RFC4514 section 2.1)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of p11-kit installed on the remote host is prior to 0.26.2. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-037-01 advisory.

    New p11-kit packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the p11-kit security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-2100)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
315437	RHEL 9 : p11-kit (RHSA-2026:18599)	Nessus	Red Hat Local Security Checks	high
315308	RHEL 10 : p11-kit (RHSA-2026:18143)	Nessus	Red Hat Local Security Checks	high
299148	Fedora 42 : p11-kit (2026-7982f70f74)	Nessus	Fedora Local Security Checks	high
298696	Fedora 43 : p11-kit (2026-f1fabb2a49)	Nessus	Fedora Local Security Checks	medium
298283	Slackware Linux 15.0 / current p11-kit Vulnerability (SSA:2026-037-01)	Nessus	Slackware Local Security Checks	medium
298199	Linux Distros Unpatched Vulnerability : CVE-2026-2100	Nessus	Misc.	high

Detections

Analytics

CVE-2026-2100

high

Tenable Plugins

high

high

high

medium

medium

high