CVE-2026-41651

{"id": "CVE-2026-41651", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.0}]}, "published": "2026-04-22T14:17:04.617", "references": [{"url": "https://github.com/PackageKit/PackageKit/blob/04057883189efa225a7c785591aa87cb299782f8/src/pk-transaction.c#L2273-L2277", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/PackageKit/PackageKit/blob/04057883189efa225a7c785591aa87cb299782f8/src/pk-transaction.c#L4036", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/PackageKit/PackageKit/blob/04057883189efa225a7c785591aa87cb299782f8/src/pk-transaction.c#L873-L882", "tags": ["Product"], "source": "security-advisories@github.com"}, {"url": "https://github.com/PackageKit/PackageKit/security/advisories/GHSA-f55j-vvr9-69xv", "tags": ["Vendor Advisory", "Exploit"], "source": "security-advisories@github.com"}, {"url": "https://github.security.telekom.com/2026/04/pack2theroot-linux-local-privilege-escalation.html", "tags": ["Exploit", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/22/6", "tags": ["Mailing List", "Patch", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://github.security.telekom.com/2026/04/pack2theroot-linux-local-privilege-escalation.html", "tags": ["Exploit", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-367"}]}], "descriptions": [{"lang": "en", "value": "PackageKit is a a D-Bus abstraction layer that allows the user to manage packages in a secure way using a cross-distro, cross-architecture API. PackageKit between and including versions 1.0.2 and 1.3.4 is vulnerable to a time-of-check time-of-use (TOCTOU) race condition on transaction flags that allows unprivileged users to install packages as root and thus leads to a local privilege escalation. This is patched in version 1.3.5.\n\nA local unprivileged user can install arbitrary RPM packages as root, including executing RPM scriptlets, without authentication. The vulnerability is a TOCTOU race condition on `transaction->cached_transaction_flags` combined with a silent state-machine guard that discards illegal backward transitions while leaving corrupted flags in place. Three bugs exist in `src/pk-transaction.c`:\n1. Unconditional flag overwrite (line 4036): `InstallFiles()` writes caller-supplied flags to `transaction->cached_transaction_flags` without checking whether the transaction has already been authorized/started. A second call blindly overwrites the flags even while the transaction is RUNNING.\n2. Silent state-transition rejection (lines 873\u2013882): `pk_transaction_set_state()` silently discards backward state transitions (e.g. `RUNNING` \u2192 `WAITING_FOR_AUTH`) but the flag overwrite at step 1 already happened. The transaction continues running with corrupted flags.\n3. Late flag read at execution time (lines 2273\u20132277): The scheduler's idle callback reads cached_transaction_flags at dispatch time, not at authorization time. If flags were overwritten between authorization and execution, the backend sees the attacker's flags."}], "lastModified": "2026-04-24T13:43:37.347", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:packagekit_project:packagekit:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "533CCCB1-C825-4DE0-8A4C-1947F07D8E62", "versionEndExcluding": "1.3.5", "versionStartIncluding": "1.0.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}