runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.

An update of the runc package has been released.

The remote SUSE Linux SLES12 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2026:3428-2 advisory.

    Update to 1.3.6.

    - CVE-2026-41579: malicious image with a `/dev` symlink can trigger limited host filesystem integrity     violations       (bsc#1268275).

    Other updates and bugfixes:

    - Version 1.3.6:
      * When masking directories with `maskPaths`, runc will now re- use a single `tmpfs` instance (which is     not writeable)         to reduce the number `tmpfs` superblocks that need to be reaped when containers die (in particular,     Kubernetes         applies masks to per-CPU sysfs directories which get expensive quickly).
    - Version 1.3.5:
      * Recursive atime-related mount flags (rrelatime et al.) are now applied properly.
      * PR #4757 caused a regression that resulted in spurious cannot start a container that has stopped     errors when         running runc create and has thus been reverted.
      * Updated builds to Go 1.25, libseccomp v2.6.0.
      * Minor signing keyring updates.

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:3433-2 advisory.

    Update to 1.3.6.

    - CVE-2026-41579: malicious image with a `/dev` symlink can trigger limited host filesystem integrity     violations       (bsc#1268275).

    Other updates and bugfixes:

    - Version 1.3.6:
      * When masking directories with `maskPaths`, runc will now re- use a single `tmpfs` instance (which is     not writeable)         to reduce the number `tmpfs` superblocks that need to be reaped when containers die (in particular,     Kubernetes         applies masks to per-CPU sysfs directories which get expensive quickly).
    - Version 1.3.5:
      * Recursive atime-related mount flags (rrelatime et al.) are now applied properly.
      * PR #4757 caused a regression that resulted in spurious cannot start a container that has stopped     errors when         running runc create and has thus been reverted.
      * Updated builds to Go 1.25, libseccomp v2.6.0.
      * Minor signing keyring updates.

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3433-1 advisory.

    Update to 1.3.6.

    - CVE-2026-41579: malicious image with a `/dev` symlink can trigger limited host filesystem integrity     violations       (bsc#1268275).

    Other updates and bugfixes:

    - Version 1.3.6:
      * When masking directories with `maskPaths`, runc will now re- use a single `tmpfs` instance (which is     not writeable)         to reduce the number `tmpfs` superblocks that need to be reaped when containers die (in particular,     Kubernetes         applies masks to per-CPU sysfs directories which get expensive quickly).
    - Version 1.3.5:
      * Recursive atime-related mount flags (rrelatime et al.) are now applied properly.
      * PR #4757 caused a regression that resulted in spurious cannot start a container that has stopped     errors when         running runc create and has thus been reverted.
      * Updated builds to Go 1.25, libseccomp v2.6.0.
      * Minor signing keyring updates.

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES12 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:3428-1 advisory.

    Update to 1.3.6.

    - CVE-2026-41579: malicious image with a `/dev` symlink can trigger limited host filesystem integrity     violations       (bsc#1268275).

    Other updates and bugfixes:

    - Version 1.3.6:
      * When masking directories with `maskPaths`, runc will now re- use a single `tmpfs` instance (which is     not writeable)         to reduce the number `tmpfs` superblocks that need to be reaped when containers die (in particular,     Kubernetes         applies masks to per-CPU sysfs directories which get expensive quickly).
    - Version 1.3.5:
      * Recursive atime-related mount flags (rrelatime et al.) are now applied properly.
      * PR #4757 caused a regression that resulted in spurious cannot start a container that has stopped     errors when         running runc create and has thus been reverted.
      * Updated builds to Go 1.25, libseccomp v2.6.0.
      * Minor signing keyring updates.

Tenable has extracted the preceding description block directly from the SUSE 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 SUSE Linux SLES16 / SLES_SAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22942-1 advisory.

    Update to 1.3.6.

    - CVE-2026-41579: malicious image with a `/dev` symlink can trigger limited host filesystem integrity     violations       (bsc#1268275).

    Other updates and bugfixes:

    - Version 1.3.6:
      * Various integration test improvements.
      * When masking directories with `maskPaths`, runc will now re- use a single `tmpfs` instance (which is     not writeable)         to reduce the number `tmpfs` superblocks that need to be reaped when containers die (in particular,     Kubernetes         applies masks to per-CPU sysfs directories which get expensive quickly).
    - Version 1.3.5:
      * Recursive atime-related mount flags (rrelatime et al.) are now applied properly.
      * PR #4757 caused a regression that resulted in spurious cannot start a container that has stopped     errors when         running runc create and has thus been reverted.
      * Updated builds to Go 1.25, libseccomp v2.6.0.
      * Minor signing keyring updates.

Tenable has extracted the preceding description block directly from the SUSE 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 openSUSE 16 host has a package installed that is affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21431-1 advisory.

    Update to 1.3.6.

    - CVE-2026-41579: malicious image with a `/dev` symlink can trigger limited host filesystem integrity     violations       (bsc#1268275).

    Other updates and bugfixes:

    - Version 1.3.6:
      * Various integration test improvements.
      * When masking directories with `maskPaths`, runc will now re- use a single `tmpfs` instance (which is     not writeable)         to reduce the number `tmpfs` superblocks that need to be reaped when containers die (in particular,     Kubernetes         applies masks to per-CPU sysfs directories which get expensive quickly).
    - Version 1.3.5:
      * Recursive atime-related mount flags (rrelatime et al.) are now applied properly.
      * PR #4757 caused a regression that resulted in spurious cannot start a container that has stopped     errors when         running runc create and has thus been reverted.
      * Updated builds to Go 1.25, libseccomp v2.6.0.
      * Minor signing keyring updates.

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

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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - runc is a CLI tool for spawning and running containers according to the OCI specification. In versions
    prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs,
    setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an
    image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a
    hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory.
    This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks
    any malicious /dev symlink present in the container image — unlike some other Linux container tooling,
    whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue
    has been fixed in versions 1.3.6, 1.4.3 and 1.5.0. (CVE-2026-41579)

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

  - runc is a CLI tool for spawning and running containers according to the OCI specification. In versions     prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs,     setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an     image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a     hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory.
    This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks     any malicious /dev symlink present in the container image  unlike some other Linux container tooling,     whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue     has been fixed in versions 1.3.6, 1.4.3 and 1.5.0. (CVE-2026-41579)

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

ID	Name	Product	Family	Type	Severity
334724	Photon OS 5.0: Runc PHSA-2026-5.0-92-0946	Nessus	PhotonOS Local Security Checks	Local	medium
334720	SUSE SLES12 Security Update : runc (SUSE-SU-2026:3428-2)	Nessus	SuSE Local Security Checks	Local	medium
334702	SUSE SLES15 Security Update : runc (SUSE-SU-2026:3433-2)	Nessus	SuSE Local Security Checks	Local	medium
331547	SUSE SLED15 / SLES15 Security Update : runc (SUSE-SU-2026:3433-1)	Nessus	SuSE Local Security Checks	Local	high
331416	SUSE SLES12 Security Update : runc (SUSE-SU-2026:3428-1)	Nessus	SuSE Local Security Checks	Local	high
330547	SUSE SLES16 Security Update : runc (SUSE-SU-2026:22942-1)	Nessus	SuSE Local Security Checks	Local	high
329715	openSUSE 16 Security Update : runc (openSUSE-SU-2026:21431-1)	Nessus	SuSE Local Security Checks	Local	high
443778	SCA: security update for github.com/opencontainers/runc (GHSA-xjvp-4fhw-gc47)	Tenable Cloud Security	SCA Checks	Local	medium
443778	SCA: security update for github.com/opencontainers/runc (GHSA-xjvp-4fhw-gc47)	Tenable Self-Hosted Container Security	SCA Checks	Local	medium
443383	Alpine: multiple runc packages: security update to 1.4.3-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	low
443383	Alpine: multiple runc packages: security update to 1.4.3-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	low
320986	Linux Distros Unpatched Vulnerability : CVE-2026-41579	Nessus	Misc.	Local	low

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