# CVE-2026-85498: gir1.2-polkit-1.0: A flaw was found in polkit

CVE-2026-85498 is fixed in 7 products on 1 platform, first by gir1.2-polkit-1.0 127-2ubuntu1.1, released September 6, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-85498
- Priority: Routine
- CVSS: 3.5 (Medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 6, 2026

## Description

A flaw was found in polkit. When processing input that begins with a null byte, an arithmetic error in the authentication agent helper causes an integer underflow during buffer length calculation, resulting in an out-of-bounds memory read. An attacker capable of supplying crafted input can trigger this flaw, potentially causing an application crash and resulting in a Denial of Service (DoS).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gir1.2-polkit-1.0 Ubuntu 22.04.1 LTS (jammy) | 0.105-33ubuntu0.2 | [gir1.2-polkit-1.0 0.105-33ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-gir1.2-polkit-1.0-0.105-33ubuntu0.2.md) | Sep 17, 2026 |
| Linux | gir1.2-polkit-1.0 Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [gir1.2-polkit-1.0 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-gir1.2-polkit-1.0-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |
| Linux | gir1.2-polkit-1.0 Ubuntu 26.04.1 LTS (resolute) | 127-2ubuntu1.1 | [gir1.2-polkit-1.0 127-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-gir1.2-polkit-1.0-127-2ubuntu1.1.md) | Sep 6, 2026 |
| Linux | libpolkit-agent-1-0 Ubuntu 22.04.1 LTS (jammy) | 0.105-33ubuntu0.2 | [libpolkit-agent-1-0 0.105-33ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libpolkit-agent-1-0-0.105-33ubuntu0.2.md) | Sep 17, 2026 |
| Linux | libpolkit-agent-1-0 Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [libpolkit-agent-1-0 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libpolkit-agent-1-0-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |
| Linux | libpolkit-agent-1-0 Ubuntu 26.04.1 LTS (resolute) | 127-2ubuntu1.1 | [libpolkit-agent-1-0 127-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libpolkit-agent-1-0-127-2ubuntu1.1.md) | Sep 6, 2026 |
| Linux | libpolkit-gobject-1-0 Ubuntu 22.04.1 LTS (jammy) | 0.105-33ubuntu0.2 | [libpolkit-gobject-1-0 0.105-33ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libpolkit-gobject-1-0-0.105-33ubuntu0.2.md) | Sep 17, 2026 |
| Linux | libpolkit-gobject-1-0 Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [libpolkit-gobject-1-0 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libpolkit-gobject-1-0-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |
| Linux | libpolkit-gobject-1-0 Ubuntu 26.04.1 LTS (resolute) | 127-2ubuntu1.1 | [libpolkit-gobject-1-0 127-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libpolkit-gobject-1-0-127-2ubuntu1.1.md) | Sep 6, 2026 |
| Linux | pkexec Ubuntu 22.04.1 LTS (jammy) | 0.105-33ubuntu0.2 | [pkexec 0.105-33ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-pkexec-0.105-33ubuntu0.2.md) | Sep 17, 2026 |
| Linux | pkexec Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [pkexec 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-pkexec-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |
| Linux | pkexec Ubuntu 26.04.1 LTS (resolute) | 127-2ubuntu1.1 | [pkexec 127-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-pkexec-127-2ubuntu1.1.md) | Sep 6, 2026 |
| Linux | policykit-1 Debian 14 | 128-1 | [DEBIAN-CVE-2026-85498](https://patchblox.com/security/data/fix/linux/debian-cve-2026-85498.md) | Nov 8, 2026 |
| Linux | policykit-1 Ubuntu 22.04.1 LTS (jammy) | 0.105-33ubuntu0.2 | [policykit-1 0.105-33ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-policykit-1-0.105-33ubuntu0.2.md) | Sep 17, 2026 |
| Linux | policykit-1 Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [policykit-1 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-policykit-1-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |
| Linux | polkitd Ubuntu 22.04.1 LTS (jammy) | 0.105-33ubuntu0.2 | [polkitd 0.105-33ubuntu0.2](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-polkitd-0.105-33ubuntu0.2.md) | Sep 17, 2026 |
| Linux | polkitd Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [polkitd 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-polkitd-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |
| Linux | polkitd Ubuntu 26.04.1 LTS (resolute) | 127-2ubuntu1.1 | [polkitd 127-2ubuntu1.1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-polkitd-127-2ubuntu1.1.md) | Sep 6, 2026 |
| Linux | polkitd-pkla Ubuntu 24.04.5 LTS (noble) | 124-2ubuntu1.24.04.4 | [polkitd-pkla 124-2ubuntu1.24.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-noble-polkitd-pkla-124-2ubuntu1.24.04.4.md) | Sep 17, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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