Skip to main content
Threat Radar animated logo
DashboardThreatsMapFeedsPricingView Plans & Pricing
reconnecting
Press slash or control plus K to focus the search. Use the arrow keys to navigate results and press enter to open a threat.
Reconnecting to live updates…

UBUNTU-CVE-2026-9539

0
Unknown
Vulnerabilitygcveosvubuntu-cve-2026-9539ubuntu-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-25-10ubuntu-26-04-lts
Published: 06/24/2026 (06/24/2026, 05:17:00 UTC)
Source: GCVE Database
Product: libslirp

Description

An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).

CVSS v3.1

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Affected software

Ubuntu:20.04:LTSmore threats →ghsa
libslirp
pkg:deb/ubuntu/[email protected]?arch=source&distro=focal
Affected versions
=4.0.0-1=4.0.0-2=4.1.0-1=4.1.0-2=4.1.0-2ubuntu1=4.1.0-2ubuntu2=4.1.0-2ubuntu2.1=4.1.0-2ubuntu2.2
Ubuntu:22.04:LTSmore threats →ghsa
libslirp
pkg:deb/ubuntu/[email protected]?arch=source&distro=jammy
Affected versions
<4.6.1-1ubuntu0.2=4.4.0-1build1=4.6.1-1=4.6.1-1build1
Ubuntu:24.04:LTSmore threats →ghsa
libslirp
pkg:deb/ubuntu/[email protected]?arch=source&distro=noble
Affected versions
<4.7.0-1ubuntu3.1=4.7.0-1ubuntu1=4.7.0-1ubuntu2=4.7.0-1ubuntu3
Ubuntu:25.10more threats →ghsa
libslirp
pkg:deb/ubuntu/[email protected]?arch=source&distro=questing
Affected versions
=4.8.0-1ubuntu1
Ubuntu:26.04:LTSmore threats →ghsa
libslirp
pkg:deb/ubuntu/[email protected]?arch=source&distro=resolute
Affected versions
<4.9.1-1ubuntu1.1=4.8.0-1ubuntu1=4.9.1-1ubuntu1

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-9539
Osv Schema Version
1.7.0
Aliases
[]
Ecosystems
["Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
Database Specific Severity
null
Cvss Version
3.1

Threat ID: 6a58b4f968715ace43db2212

Added to database: 07/16/2026, 10:39:53 UTC

Last updated: 07/16/2026, 10:39:53 UTC

Views: 1

Community Reviews

0 reviews

Crowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.

Sort by
Loading community insights…

Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.

Actions

Please log in to the Console to use AI analysis features.

Need more coverage?

Upgrade to Pro Console for AI refresh and higher limits.

For incident response and remediation, OffSeq services can help resolve threats faster.

Latest Threats

Breach by OffSeqOFFSEQFRIENDS — 25% OFF

Check if your credentials are on the dark web

Instant breach scanning across billions of leaked records. Free tier available.

Scan now
OffSeq TrainingCredly Certified

Lead Pen Test Professional

Technical5-day eLearningPECB Accredited
View courses