CVE Tools
Track your stack

CVE-2023-32629

Public exploit available. Not confirmed exploited in the wild yet. A vendor fix is available.

CVSS 3.17.8HighEPSS percentile95th8.8% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
Public exploit: 1 sourceFixVendor fixNo build named by the sources

Published Updated Sources: CVE.org, NVD, BDU

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

  • ООО «РусБИТех-Астра» Astra Linux Special Edition для «Эльбрус»Affected: 8.1 «Ленинград»Upgrade to: not statedStated by: BDU
  • ООО «РусБИТех-Астра» Astra Linux Special EditionAffected: 1.7Upgrade to: not statedStated by: BDU
  • Canonical Ltd. UbuntuAffected: 23.04Upgrade to: not statedStated by: BDU

Versions as the sources state them. Full version matrix after sign-in

Steps

Written by AI from the record
  1. Check whether each Linux server or workstation runs Ubuntu or Astra Linux and identify its installed kernel package version.
  2. For Ubuntu, apply the current kernel security update referenced in Ubuntu Security Notice USN-6250-1, then restart into the updated kernel.
  3. For Astra Linux, update the linux package to 5.4.0-162.astra1+ci6 or later, then restart.
  4. If updates must wait, temporarily prevent unprivileged users from creating namespaces with sudo sysctl -w kernel.unprivileged_userns_clone=0.
  5. Confirm after restart that the new kernel is running and investigate unexpected local administrator-account or system-setting changes.
Vendor advisory Usually a quick update
Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

Local privilege escalation vulnerability in Ubuntu Kernels overlayfs ovl_copy_up_meta_inode_data skip permission checks when calling ovl_do_setxattr on Ubuntu kernels

In plain language

Written by AI from the record

This flaw lets a logged-in user on affected Ubuntu or Astra Linux systems gain full control, so small businesses should install the available kernel updates promptly.

CVE-2023-32629 is a local privilege-escalation flaw in Ubuntu kernel overlayfs caused by missing permission checks when setting extended file attributes during copy-up.

If you're affected

  • Full server takeover
  • Customer data exposure
  • Ransomware deployment
  • Service disruption

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS95th
Public exploit
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

1 source with a proof of concept or module.

Exploit links, PoCs and Metasploit modules after sign-in
EPSS

8.8% chance of exploitation activity in the next 30 days, which ranks it in the 95th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

The patch came 471 days before any public exploit.

  1. EPSS band changemoderate → lowepss band change
  2. EPSS band changelow → moderate
  3. EPSS band changelow → moderateepss band change
  4. OpenVAS check added
  5. EPSS band changehigh → low
  6. Public exploit / PoCsource: packetstorm

Affected products

And 1 more affected product. See all after sign-in

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Scored 7.8 by NVD.

How it is reached

  • Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required LowRequires basic user-level privileges
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Weaknesses

ATT&CK techniques

Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.

Sources

References in the record

And 5 more references. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Ubuntu, not every advisory. This one: public exploit.