Time-of-check Time-of-use (TOCTOU) Affecting PackageKit-command-not-found package, versions <0:1.1.12-8.el8_10


Severity

Recommended
high

Based on Rocky Linux security rating.

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
0.46% (38th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ROCKY8-PACKAGEKITCOMMANDNOTFOUND-16347419
  • published3 May 2026
  • disclosed22 Apr 2026

Introduced: 22 Apr 2026

CVE-2026-41651  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 PackageKit-command-not-found to version 0:1.1.12-8.el8_10 or higher.
This issue was patched in RLSA-2026:11635.

NVD Description

Note: Versions mentioned in the description apply only to the upstream PackageKit-command-not-found package and not the PackageKit-command-not-found package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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.

A 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-&gt;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:

  1. Unconditional flag overwrite (line 4036): InstallFiles() writes caller-supplied flags to transaction-&gt;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.
  2. Silent state-transition rejection (lines 873–882): pk_transaction_set_state() silently discards backward state transitions (e.g. RUNNING → WAITING_FOR_AUTH) but the flag overwrite at step 1 already happened. The transaction continues running with corrupted flags.
  3. Late flag read at execution time (lines 2273–2277): 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.

CVSS Base Scores

version 3.1