Vulnerability-Lookup

UBUNTU-CVE-2026-19816 (CVE-2026-19816)

Vulnerability from osv_ubuntu – Published: 2026-09-14 20:16 – Updated: 2026-09-16 11:31 – Source website

Details

A flaw was found in PackageKit. PackageKit skips the polkit authorization check for transactions carrying the SIMULATE (dry-run) flag. In the dnf5 backend, the RepoRemove handler ignores that contract and always executes the real transaction because its guard is written as (role == REPO_REMOVE || !SIMULATE), which is always true for RepoRemove. An unprivileged local user can therefore perform a genuine package uninstall while claiming to simulate. This vulnerability only affects systems using PackageKit with the dnf5 backend.

Severity

7.1 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-19816	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-19816	REPORT
	https://bugzilla.redhat.com/show_bug.cgi?id=2515940	REPORT
	https://github.com/PackageKit/PackageKit/security…	REPORT

JSON

To clipboard

{
  "affected": [
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        "binaries": [
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  ],
  "aliases": [],
  "details": "A flaw was found in PackageKit. PackageKit skips the polkit authorization check for transactions carrying the SIMULATE (dry-run) flag. In the dnf5 backend, the RepoRemove handler ignores that contract and always executes the real transaction because its guard is written as (role == REPO_REMOVE || !SIMULATE), which is always true for RepoRemove. An unprivileged local user can therefore perform a genuine package uninstall while claiming to simulate. This vulnerability only affects systems using PackageKit with the dnf5 backend.",
  "id": "UBUNTU-CVE-2026-19816",
  "modified": "2026-09-16T11:31:18Z",
  "published": "2026-09-14T20:16:00Z",
  "references": [
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515940"
    },
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    }
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  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
      "type": "CVSS_V3"
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      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
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  ]
}

CVE-2026-19816 (GCVE-0-2026-19816)

Vulnerability from cvelistv5 – Published: 2026-09-14 20:05 – Updated: 2026-09-15 18:04

Title

PackageKit: dnf5 backend ignores SIMULATE on RepoRemove

Summary

Severity

7.1 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 17:38 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

fedora redhat root

References

3 references

URL	Tags
https://github.com/PackageKit/PackageKit/commit/3…	patch
https://github.com/PackageKit/PackageKit/security…	vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2515940	issue-tracking

Impacted products

7 products

Vendor	Product	Version
		Affected: 1.3.4 , < 1.4.0 (semver)
Fedora	Fedora	Affected: 1.3.4 , < 1.4.0 (semver)
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9
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

Date Public

2026-09-09 19:16

Credits

Vivek Parikh (BreachX Zero Day Labs)

Show details on NVD website

JSON

To clipboard

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            "issue-tracking"
          ],
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515940"
        }
      ],
      "title": "PackageKit: dnf5 backend ignores SIMULATE on RepoRemove",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
    "assignerShortName": "fedora",
    "cveId": "CVE-2026-19816",
    "datePublished": "2026-09-14T20:05:00.169Z",
    "dateReserved": "2026-08-14T02:40:21.336Z",
    "dateUpdated": "2026-09-15T18:04:51.167Z",
    "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.
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.