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Ubuntu LinuxOperating system · Canonical

CVE-2024-6387

HIGH · 8.1 CVSS v3.1 Published 2024-07-01
Patch available
A vendor patch is available. No clean upgrade release — apply the published patch.
See remediation →
90/100
Remediation priority · Urgent
High EPSS Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals in an unsafe manner. An unauthenticated, remote attacker may be able to trigger it by failing to authenticate within a set time period.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ubuntu LinuxOperating system
Affected:= 23.10= 24.04= 22.04= 22.10= 23.04
Openshift Container PlatformApplication
Affected:= 4.0
Enterprise LinuxOperating system
Affected:= 9.0
Enterprise Linux EusOperating system
Affected:= 9.4
Enterprise Linux For Arm 64Operating system
Affected:= 9.0_aarch64
Enterprise Linux For Arm 64 EusOperating system
Affected:= 9.4_aarch64
Enterprise Linux For Ibm Z SystemsOperating system
Affected:= 9.0_s390x
Enterprise Linux For Ibm Z Systems EusOperating system
Affected:= 9.4_s390x

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Patch available Apply the vendor patch
Vendor patch www.openwall.com →
Recommended fix High confidence

Upgrade to OpenSSH version 9.8p1 or later, which contains the fix for CVE-2024-6387. For Ubuntu, upgrade to Ubuntu 24.04 LTS or apply updates to openssh-server package. For RHEL 9.x, ensure openssh-9.0p1 or later is installed.

  1. 1. Identify the current OpenSSH version by running: sshd -V or rpm -q openssh-server (RHEL) / dpkg -l openssh-server (Ubuntu)
  2. 2. For Ubuntu systems: Run 'sudo apt update' followed by 'sudo apt upgrade openssh-server' to obtain the latest security patches
  3. 3. For RHEL/Enterprise Linux systems: Run 'sudo yum update openssh-server' or 'sudo dnf update openssh-server' to apply security fixes
  4. 4. After updating, verify the new version is installed: rpm -q openssh-server (RHEL) / dpkg -l openssh-server (Ubuntu)
  5. 5. Restart the sshd service to load the updated binary: 'sudo systemctl restart sshd' (Ubuntu) or 'sudo systemctl restart sshd' (RHEL)
  6. 6. Verify sshd is running correctly: 'sudo systemctl status sshd'
  7. 7. Test SSH connectivity from a remote client to confirm the service operates normally after the update
Caveat The upgrade is a standard security update and should not introduce breaking changes; however, test in a staging environment first to verify compatibility with existing SSH configurations and key types.

Generated from the published advisory — verify against the referenced sources before acting.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-6387 in production — separate from our analysis above.

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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