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CVE-2026-19816— PackageKit: dnf5 backend ignores SIMULATE on RepoRemove

Quick assessment

Affected
CVE-2026-19816
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 PackageKit 中发现了一个缺陷：PackageKit 会跳过带有 SIMULATE（试运行）标志的事务的 polkit 授权检查。在 dnf5 后端中，RepoRemove 处理器忽略了这一约定，并且总是执行真实的事务，因为其守卫条件被写为 ，而对于 RepoRemove 该条件恒为真。因此，非特权本地用户可以声称在执行模拟操作时，实际上完成了真实的软件包卸载。该漏洞仅影响使用 dnf5 后端的 PackageKit 系统。

CVSS 7.1 · High

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

I. Basic Information for CVE-2026-19816

Vulnerability Information
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Vulnerability Title
PackageKit: dnf5 backend ignores SIMULATE on RepoRemove
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 1.3.4 ~ 1.4.0 -
Fedora Fedora 1.3.4 ~ 1.4.0 -
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 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8

II. Public POCs for CVE-2026-19816

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III. Intelligence Information for CVE-2026-19816

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Patches & Fixes for CVE-2026-19816 (1)

Vendor Advisories for CVE-2026-19816 (2)

IV. Related Vulnerabilities

Same weakness: CWE-863

V. Comments for CVE-2026-19816

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