Vulnerability-Lookup

RHSA-2026:81391

Vulnerability from csaf_redhat - Published: 2026-10-12 17:14 - Updated: 2026-10-12 20:59

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: busybox: * busybox-1.37.0-9.4.hum1 (aarch64, s390x, x86_64) * busybox-petitboot-1.37.0-9.4.hum1 (aarch64, s390x, x86_64) * busybox-shared-1.37.0-9.4.hum1 (aarch64, s390x, x86_64) * busybox-1.37.0-9.4.hum1.src (src) Security Fix(es): busybox: * CVE-2026-108119

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-2026-108119

A flaw was found in busybox. The tar applet's deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly '..' combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution.

6.3 (Medium)


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

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Affected products

Fixed 10 products

Product	Version	Remediation
Unresolved product id: Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@src	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@x86_64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@aarch64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:81391	self
https://access.redhat.com/security/cve/CVE-2026-108119	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-2026-108119	self
https://bugzilla.redhat.com/show_bug.cgi?id=2548611	external
https://www.cve.org/CVERecord?id=CVE-2026-108119	external
https://nvd.nist.gov/vuln/detail/CVE-2026-108119	external

Acknowledgments

TAE3

JSON

To clipboard

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        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
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          "text": "A flaw was found in busybox. The tar applet\u0027s deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly \u0027..\u0027 combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution.",
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          "title": "Vulnerability summary"
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        {
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          "text": "This vulnerability is rated as having a Moderate impact because successful exploitation requires an attacker to convince a user or automated process to extract an untrusted archive, combined with non-trivial filesystem or extraction directory reuse constraints. The risk is further confined to scenarios where the BusyBox implementation of tar processes malicious archives with elevated privileges.",
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        {
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          "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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        }
      ],
      "release_date": "2026-10-09T15:31:42.723000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-12T17:14:28+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:busybox-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@src",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@x86_64",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@x86_64",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:81391"
        },
        {
          "category": "workaround",
          "details": "Avoid extracting tar archives from untrusted sources using busybox, especially with elevated privileges or into a directory that will be reused for a subsequent extraction. If untrusted archives must be processed, extract into a freshly created, isolated directory with minimal privileges on a single filesystem boundary and discard it (including any links left on disk) after each extraction.",
          "product_ids": [
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@src",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@x86_64",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@x86_64",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@src",
            "Red Hat Hardened Images:busybox-0:1.37.0-9.4.hum1@x86_64",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-petitboot-0:1.37.0-9.4.hum1@x86_64",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@aarch64",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@s390x",
            "Red Hat Hardened Images:busybox-shared-0:1.37.0-9.4.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "busybox: busybox: tar extraction-root escape via deferred symlink/hardlink creation bypasses CVE-2026-26158 fix"
    }
  ]
}

CVE-2026-108119 (GCVE-0-2026-108119)

Vulnerability from cvelistv5 – Published: 2026-10-09 16:45 – Updated: 2026-10-12 20:59

Title

Busybox: busybox: tar extraction-root escape via deferred symlink/hardlink creation bypasses cve-2026-26158 fix

Summary

Severity

6.3 (Medium)


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

CWE

CWE-59 - Improper Link Resolution Before File Access ('Link Following')

Assigner

redhat CNA under the redhat root

CNA scorecard B 81/100 over 979 records in the last 180 days details

References

3 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:81391	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-108119	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2548611	issue-trackingx_refsource_REDHAT

Impacted products

2 products

Vendor	Product	Version
Red Hat	Red Hat Hardened Images	Unaffected: 1.37.0-9.4.hum1 , < * (rpm) cpe:/a:redhat:hummingbird:1
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6

Date Public

2026-10-09 15:31

Credits

Red Hat would like to thank TAE3 for reporting this issue.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:hummingbird:1"
          ],
          "defaultStatus": "affected",
          "packageName": "busybox-main",
          "product": "Red Hat Hardened Images",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1.37.0-9.4.hum1",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "cpes": [
            "cpe:/o:redhat:enterprise_linux:6"
          ],
          "defaultStatus": "affected",
          "packageName": "busybox",
          "product": "Red Hat Enterprise Linux 6",
          "vendor": "Red Hat"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Red Hat would like to thank TAE3 for reporting this issue."
        }
      ],
      "datePublic": "2026-10-09T15:31:42.723Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw was found in busybox. The tar applet\u0027s deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly \u0027..\u0027 combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution."
        }
      ],
      "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": "HIGH",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-59",
              "description": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-12T20:59:23.895Z",
        "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "shortName": "redhat"
      },
      "references": [
        {
          "name": "RHSA-2026:81391",
          "tags": [
            "vendor-advisory",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:81391"
        },
        {
          "tags": [
            "vdb-entry",
            "x_refsource_REDHAT"
          ],
          "url": "https://access.redhat.com/security/cve/CVE-2026-108119"
        },
        {
          "name": "RHBZ#2548611",
          "tags": [
            "issue-tracking",
            "x_refsource_REDHAT"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2548611"
        }
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-10-09T14:03:56.635Z",
          "value": "Reported to Red Hat."
        },
        {
          "lang": "en",
          "time": "2026-10-09T15:31:42.723Z",
          "value": "Made public."
        }
      ],
      "title": "Busybox: busybox: tar extraction-root escape via deferred symlink/hardlink creation bypasses cve-2026-26158 fix",
      "workarounds": [
        {
          "lang": "en",
          "value": "Avoid extracting tar archives from untrusted sources using busybox, especially with elevated privileges or into a directory that will be reused for a subsequent extraction. If untrusted archives must be processed, extract into a freshly created, isolated directory with minimal privileges on a single filesystem boundary and discard it (including any links left on disk) after each extraction."
        }
      ],
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_redhatCweChain": "CWE-59: Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
    "assignerShortName": "redhat",
    "cveId": "CVE-2026-108119",
    "datePublished": "2026-10-09T16:45:59.735Z",
    "dateReserved": "2026-10-09T14:09:13.658Z",
    "dateUpdated": "2026-10-12T20:59:23.895Z",
    "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.

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.

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Action not permitted

RHSA-2026:81391

CVE-2026-108119 (GCVE-0-2026-108119)

Tags

Sightings

Nomenclature

Related by attack behaviour