Vulnerability-Lookup

RHSA-2026:51861

Vulnerability from csaf_redhat - Published: 2026-08-07 20:16 - Updated: 2026-08-09 11:06

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Severity

Moderate

Notes

Topic: An update for Red Hat Hardened Images RPMs is now available.

Details: This update includes the following RPMs: policycoreutils: * policycoreutils-3.11-2.2.hum1 (aarch64, x86_64) * policycoreutils-dbus-3.11-2.2.hum1 (noarch) * policycoreutils-devel-3.11-2.2.hum1 (aarch64, x86_64) * policycoreutils-gui-3.11-2.2.hum1 (noarch) * policycoreutils-newrole-3.11-2.2.hum1 (aarch64, x86_64) * policycoreutils-python-utils-3.11-2.2.hum1 (noarch) * policycoreutils-restorecond-3.11-2.2.hum1 (aarch64, x86_64) * policycoreutils-sandbox-3.11-2.2.hum1 (aarch64, x86_64) * python3-policycoreutils-3.11-2.2.hum1 (noarch) * policycoreutils-3.11-2.2.hum1.src (src) Security Fix(es): policycoreutils: * CVE-2026-19079

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-19079

A TOCTOU (Time-of-Check-Time-of-Use) race condition vulnerability was found in the fixfiles script in policycoreutils. When running fixfiles relabel or fixfiles restore, the script used find and chcon commands to locate and relabel unlabeled files under /tmp and other directories. A local attacker could exploit a race window between the file discovery and the label change operation by swapping directory components with symlinks, causing chcon to follow the symlink and modify SELinux labels on arbitrary system files. This could undermine SELinux mandatory access control protections on critical files such as /etc/shadow.

4.4 (Medium)


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

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Affected products

Fixed 4 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:policycoreutils-main@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:policycoreutils-main@noarch	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:policycoreutils-main@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:policycoreutils-main@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:51861	self
https://access.redhat.com/security/cve/CVE-2026-19079	external
https://access.redhat.com/security/updates/classi…	external
https://images.redhat.com/	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-19079	self
https://bugzilla.redhat.com/show_bug.cgi?id=2511976	external
https://www.cve.org/CVERecord?id=CVE-2026-19079	external
https://nvd.nist.gov/vuln/detail/CVE-2026-19079	external
https://github.com/SELinuxProject/selinux/commit/…	external

Acknowledgments

Stephen Smalley

JSON

To clipboard

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        "title": "Details"
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          "names": [
            "Stephen Smalley"
          ],
          "summary": "Acknowledged by upstream."
        }
      ],
      "cve": "CVE-2026-19079",
      "cwe": {
        "id": "CWE-367",
        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "discovery_date": "2026-07-08T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2511976"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A TOCTOU (Time-of-Check-Time-of-Use) race condition vulnerability was found in the fixfiles script in policycoreutils. When running fixfiles relabel or fixfiles restore, the script used find and chcon commands to locate and relabel unlabeled files under /tmp and other directories. A local attacker could exploit a race window between the file discovery and the label change operation by swapping directory components with symlinks, causing chcon to follow the symlink and modify SELinux labels on arbitrary system files. This could undermine SELinux mandatory access control protections on critical files such as /etc/shadow.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "policycoreutils: policycoreutils: TOCTOU race condition in fixfiles allows arbitrary SELinux label manipulation",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat ships policycoreutils with the fixfiles script in all supported RHEL versions. The vulnerable /tmp cleanup code path has been present in fixfiles for many years. Red Hat product impact analysis is required to determine which specific shipped versions of policycoreutils include the vulnerable code and whether backporting the upstream fix is necessary. The vulnerability requires local access, winning a race condition, and an administrator running fixfiles relabel or fixfiles restore, which limits the practical attack surface.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "Red Hat Hardened Images:policycoreutils-main@noarch",
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          "Red Hat Hardened Images:policycoreutils-main@x86_64"
        ]
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        {
          "category": "external",
          "summary": "RHBZ#2511976",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511976"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-19079",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-19079"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-19079",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19079"
        },
        {
          "category": "external",
          "summary": "https://github.com/SELinuxProject/selinux/commit/a556538c2d5d2583273e025b45c02651fef47679",
          "url": "https://github.com/SELinuxProject/selinux/commit/a556538c2d5d2583273e025b45c02651fef47679"
        }
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      "release_date": "2026-07-08T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-07T20:16:32+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:policycoreutils-main@aarch64",
            "Red Hat Hardened Images:policycoreutils-main@noarch",
            "Red Hat Hardened Images:policycoreutils-main@src",
            "Red Hat Hardened Images:policycoreutils-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:51861"
        },
        {
          "category": "workaround",
          "details": "As a workaround, use \u0027restorecon -R /\u0027 directly instead of \u0027fixfiles relabel\u0027 or \u0027fixfiles restore\u0027 to perform filesystem relabeling. This avoids the vulnerable /tmp-specific find+chcon code path entirely. Note that this skips the /tmp cleanup logic, but on modern systems where /tmp is mounted as tmpfs, this cleanup is unnecessary as tmpfs cannot retain files from a prior boot.",
          "product_ids": [
            "Red Hat Hardened Images:policycoreutils-main@aarch64",
            "Red Hat Hardened Images:policycoreutils-main@noarch",
            "Red Hat Hardened Images:policycoreutils-main@src",
            "Red Hat Hardened Images:policycoreutils-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:policycoreutils-main@aarch64",
            "Red Hat Hardened Images:policycoreutils-main@noarch",
            "Red Hat Hardened Images:policycoreutils-main@src",
            "Red Hat Hardened Images:policycoreutils-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "policycoreutils: policycoreutils: TOCTOU race condition in fixfiles allows arbitrary SELinux label manipulation"
    }
  ]
}

CVE-2026-19079 (GCVE-0-2026-19079)

Vulnerability from cvelistv5 – Published: 2026-08-07 07:21 – Updated: 2026-08-07 20:20

Title

Policycoreutils: policycoreutils: toctou race condition in fixfiles allows arbitrary selinux label manipulation

Summary

Severity

4.4 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-07 17:40 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

redhat

References

4 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:51861	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-19079	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2511976	issue-trackingx_refsource_REDHAT
https://github.com/SELinuxProject/selinux/commit/…

Impacted products

7 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 3.11-2.2.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 8	cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat OpenShift Container Platform 4	cpe:/a:redhat:openshift:4

Date Public

2026-07-08 00:00

Credits

Upstream acknowledges Stephen Smalley as the original reporter.

Show details on NVD website

JSON

To clipboard

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        {
          "lang": "en",
          "value": "A TOCTOU (Time-of-Check-Time-of-Use) race condition vulnerability was found in the fixfiles script in policycoreutils. When running fixfiles relabel or fixfiles restore, the script used find and chcon commands to locate and relabel unlabeled files under /tmp and other directories. A local attacker could exploit a race window between the file discovery and the label change operation by swapping directory components with symlinks, causing chcon to follow the symlink and modify SELinux labels on arbitrary system files. This could undermine SELinux mandatory access control protections on critical files such as /etc/shadow."
        }
      ],
      "metrics": [
        {
          "other": {
            "content": {
              "namespace": "https://access.redhat.com/security/updates/classification/",
              "value": "Moderate"
            },
            "type": "Red Hat severity rating"
          }
        },
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 4.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-07T20:20:25.425Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "name": "RHSA-2026:51861",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:51861"
        },
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-19079"
        },
        {
          "name": "RHBZ#2511976",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511976"
        },
        {
          "url": "https://github.com/SELinuxProject/selinux/commit/a556538c2d5d2583273e025b45c02651fef47679"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-07-08T00:00:00.000Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-07-08T00:00:00.000Z",
          "value": "Made public."
        }
      ],
      "title": "Policycoreutils: policycoreutils: toctou race condition in fixfiles allows arbitrary selinux label manipulation",
      "workarounds": [
        {
          "lang": "en",
          "value": "As a workaround, use \u0027restorecon -R /\u0027 directly instead of \u0027fixfiles relabel\u0027 or \u0027fixfiles restore\u0027 to perform filesystem relabeling. This avoids the vulnerable /tmp-specific find+chcon code path entirely. Note that this skips the /tmp cleanup logic, but on modern systems where /tmp is mounted as tmpfs, this cleanup is unnecessary as tmpfs cannot retain files from a prior boot."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-19079",
    "datePublished": "2026-08-07T07:21:55.858Z",
    "dateReserved": "2026-08-06T11:13:39.734Z",
    "dateUpdated": "2026-08-07T20:20:25.425Z",
    "state": "PUBLISHED"
  },
  "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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

RHSA-2026:51861

CVE-2026-19079 (GCVE-0-2026-19079)

Tags

Sightings

Nomenclature