CVE-2026-59678Public exploit

Local mount and network modification via Polkit bypass

Published Jul 23, 2026 · Updated Jul 23, 2026

Incorrect authorization in Linux-Gaming PortProtonQt 0.1.12 through 1.3.0 allows local users to alter mounts and network connections. The installed ru.linux_gaming.PortProtonQt.rules Polkit rule grants privileged UDisks2 and NetworkManager actions when a requester or its parent has ppqtos anywhere in a user-controlled command line. Any local user can spoof that substring to mount block devices under /run/media, unmount devices not in use, or create and remove system network connections.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Linux-Gaming PortProtonQt 0.1.12 through 1.3.0 allows local users to alter mounts and network connections. The installed ru.linux_gaming.PortProtonQt.rules Polkit rule grants privileged UDisks2 and NetworkManager actions when a requester or its parent has ppqtos anywhere in a user-controlled command line. Any local user can spoof that substring to mount block devices under /run/media, unmount devices not in use, or create and remove system network connections.

The record

CVE
CVE-2026-59678
Published
Jul 23, 2026
Updated
Jul 23, 2026
Vendor
Linux-Gaming
Product
PortProtonQt
Classifications
CWE-863, T1548
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0d0f0950ebd948cdf82e8c3e1ebd2bcb9b8bafbe

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Linux-Gaming · PortProtonQtversion=0 <0d0f0950ebd948cdf82e8c3e1ebd2bcb9b8bafbe

Published CVSS scores

7.1SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1548Abuse Elevation Control Mechanism

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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