Vulnerability-Lookup

SUSE-SU-2026:23047-1

Vulnerability from csaf_suse - Published: 2026-08-03 07:15 - Updated: 2026-09-20 18:40

Summary

Security update for runc

Severity

Low

Notes

Title of the patch: Security update for runc

Description of the patch: This update for runc fixes the following issues: - CVE-2026-41579: runc allows a malicious image with a /dev symlink to trigger limited host filesystem integrity violations (bsc#1268275). Changes for runc: - update to 1.3.6: * Various integration test improvements. (#5222, #5237, #5226, #5229, #5239, #5249, #5269, #5287, #5295, #5304) * 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). - update to 1.3.5 * Recursive atime-related mount flags (rrelatime et al.) are now applied properly. (#5115, #5098) * 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. (#5158, #5153, #5151, #4645, #4757) * Updated builds to Go 1.25, libseccomp v2.6.0. (#5111, #5053) * Minor signing keyring updates. (#5146, #5139, #5144, #5148)

Patchnames: SUSE-SLE-Micro-6.0-827

CVE-2026-41579

3.3 (Low)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected products

Recommended 3 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.0:runc-0:1.3.6-1.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:runc-0:1.3.6-1.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.0:runc-0:1.3.6-1.1.x86_64	—	Vendor Fix

Threats

Impact low

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1268275	self
https://www.suse.com/security/cve/CVE-2026-41579/	self
https://www.suse.com/security/cve/CVE-2026-41579	external
https://bugzilla.suse.com/1268275	external

JSON

To clipboard

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}

CVE-2026-41579 (GCVE-0-2026-41579)

Vulnerability from cvelistv5 – Published: 2026-07-01 00:02 – Updated: 2026-07-01 13:35

Title

runc: Malicious image with /dev symlink can trigger limited host filesystem integrity violations

Summary

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.

Severity

3.3 (Low)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-01 13:34 UTC

CWE

CWE-61 - UNIX Symbolic Link (Symlink) Following

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/opencontainers/runc/security/a…	x_refsource_CONFIRM
https://github.com/opencontainers/runc/commit/864…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
opencontainers	runc	Affected: < 1.3.6 Affected: >= 1.4.0-rc.1, < 1.4.3 Affected: >= 1.5.0-rc.1, < 1.5.0-rc.3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-41579",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-01T13:34:05.348945Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-01T13:35:41.354Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "runc",
          "vendor": "opencontainers",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.3.6"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.4.0-rc.1, \u003c 1.4.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.5.0-rc.1, \u003c 1.5.0-rc.3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u00a0symlink present in the container image \u2014 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 3.3,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-61",
              "description": "CWE-61: UNIX Symbolic Link (Symlink) Following",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T00:02:08.639Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47",
          "tags": [
            "x_refsource_CONFIRM"
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        },
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          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/opencontainers/runc/commit/864db8042dbb"
        }
      ],
      "source": {
        "advisory": "GHSA-xjvp-4fhw-gc47",
        "discovery": "UNKNOWN"
      },
      "title": "runc: Malicious image with /dev symlink can trigger limited host filesystem integrity violations"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
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    "dateReserved": "2026-04-21T14:15:21.958Z",
    "dateUpdated": "2026-07-01T13:35:41.354Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

SUSE-SU-2026:23047-1

CVE-2026-41579 (GCVE-0-2026-41579)

Tags

Sightings

Nomenclature

Related by attack behaviour