CVE-2025-7519

Daemon crash via unchecked XML nesting depth

Published Jul 14, 2025 · Updated Sep 1, 2026

Out-of-bounds write in polkit 126 and earlier allows local users with high privileges to crash polkitd via a deeply nested XML policy. The _start callback in polkitbackendactionpool.c advances fixed-depth parser state without rejecting a 32nd nested element, causing a write beyond its bounds. Exploitation requires permission to place a crafted policy in a monitored actions directory; code execution has not been demonstrated.

CVSS severity6.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in polkit 126 and earlier allows local users with high privileges to crash polkitd via a deeply nested XML policy. The _start callback in polkitbackendactionpool.c advances fixed-depth parser state without rejecting a 32nd nested element, causing a write beyond its bounds. Exploitation requires permission to place a crafted policy in a monitored actions directory; code execution has not been demonstrated.

The record

CVE
CVE-2025-7519
Published
Jul 14, 2025
Updated
Sep 1, 2026
Vendor
Libslirp Project
Product
Polkit
Classifications
CWE-787, T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 1, 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 <=126

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Libslirp Project · Polkitversion=0 <=126
389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container Platform 4Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

6.7Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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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