A vulnerability was found in the internal Access Control List (ACL) subsystem of kronosnet (Version affected: <= 1.34). When the framework is explicitly configured to manage dynamic links (accepting network traffic from any IP address) without network payload encryption, the validation architecture implicitly trusts the link ID provided within incoming data packets. A remote, unauthenticated attacker can exploit this lack of validation by spoofing a legitimate link ID inside crafted network frames. This allows the attacker to fully bypass the ACL framework and inject arbitrary data packets into the application layer, potentially leading to data corruption or service instabilities.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-db53330c8f advisory.

    CVE-2026-15811 (LOW): encryption key exposure in memory after cryptographic configuration changes. Wipe     cryptographic keys with explicit_bzero() before freeing to prevent exposure through memory disclosure     vulnerabilities. (Resolves rhbz#2500850)

    CVE-2026-15812 (LOW): access control list bypass via link ID spoofing on unencrypted dynamic links.
    Validate source address against claimed link_id and enable ACL by default. (Resolves rhbz#2500852)

    CVE-2026-15813 (MEDIUM): memory corruption and out-of-bounds access via malformed network packet     defragmentation. Validate fragment sequence numbers before accessing defragmentation buffers. (Resolves     rhbz#2500864)

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-2026-56568b6fe8 advisory.

    CVE-2026-15811 (LOW): encryption key exposure in memory after cryptographic configuration changes. Wipe     cryptographic keys with explicit_bzero() before freeing to prevent exposure through memory disclosure     vulnerabilities. (Resolves rhbz#2500850)

    CVE-2026-15812 (LOW): access control list bypass via link ID spoofing on unencrypted dynamic links.
    Validate source address against claimed link_id and enable ACL by default. (Resolves rhbz#2500852)

    CVE-2026-15813 (MEDIUM): memory corruption and out-of-bounds access via malformed network packet     defragmentation. Validate fragment sequence numbers before accessing defragmentation buffers. (Resolves     rhbz#2500864)

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

  - A vulnerability was found in the internal Access Control List (ACL) subsystem of kronosnet (Version     affected: <= 1.34). When the framework is explicitly configured to manage dynamic links (accepting network     traffic from any IP address) without network payload encryption, the validation architecture implicitly     trusts the link ID provided within incoming data packets. A remote, unauthenticated attacker can exploit     this lack of validation by spoofing a legitimate link ID inside crafted network frames. This allows the     attacker to fully bypass the ACL framework and inject arbitrary data packets into the application layer,     potentially leading to data corruption or service instabilities. (CVE-2026-15812)

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

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3e85d87212 advisory.

    Automatic update for kronosnet-1.35-1.fc45.

    ##### **Changelog**

    ```
    * Mon Jul 20 2026 Fabio M. Di Nitto <fdinitto@redhat.com> - 1.35-1
    - New upstream release
    - CVE-2026-15811 (LOW): encryption key exposure in memory after cryptographic configuration changes. Wipe     cryptographic keys with explicit_bzero() before freeing to prevent exposure through memory disclosure     vulnerabilities. (Resolves rhbz#2500850)
    - CVE-2026-15812 (LOW): access control list bypass via link ID spoofing on unencrypted dynamic links.
    Validate source address against claimed link_id and enable ACL by default. (Resolves rhbz#2500852)
    - CVE-2026-15813 (MEDIUM): memory corruption and out-of-bounds access via malformed network packet     defragmentation. Validate fragment sequence numbers before accessing defragmentation buffers. (Resolves     rhbz#2500864)
    - tests: add coverage for connected named AF_UNIX SOCK_STREAM sockets
    - libnozzle: Introduce test macros similar to libknet
    - docs: convert README to markdown format
    * Thu Jul 16 2026 Fedora Release Engineering <releng@fedoraproject.org> - 1.34-2
    - Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild

    ```

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.

ID	Name	Product	Family	Type	Severity
330529	Fedora 44 : kronosnet (2026-db53330c8f)	Nessus	Fedora Local Security Checks	Local	medium
330524	Fedora 43 : kronosnet (2026-56568b6fe8)	Nessus	Fedora Local Security Checks	Local	medium
328673	Linux Distros Unpatched Vulnerability : CVE-2026-15812	Nessus	Misc.	Local	medium
328049	Fedora 45 : kronosnet (2026-3e85d87212)	Nessus	Fedora Local Security Checks	Local	medium

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CVE-2026-15812

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Tenable Plugins

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