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VulnerabilityPublished

CVE-2024-23301: rear vulnerability

Affects rearSource GCVE Database

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Authoritative record:CVE-2024-23301· Medium 5.5

Not known to be exploited · CVSS 5.5 Medium · fixed in 2.3+dfsg-1ubuntu0.1~esm1 : update rear when convenient.

Data as of 4 Nov 2026, 04:01 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 2.3+dfsg-1ubuntu0.1~esm1, 2.5+dfsg-1ubuntu0.1~esm1, 2.6+dfsg-1+deb11u1build0.22.04.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Jan 2024

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Upgrade the Ubuntu rear to 2.3+dfsg-1ubuntu0.1~esm1 (package) or 2.5+dfsg-1ubuntu0.1~esm1 (package) or 2.6+dfsg-1+deb11u1build0.22.04.1 (package).

Affected software

ProductAffectedFixed in
Ubuntu 22.04 LTSrearpkg:deb/ubuntu/rear?arch=source&distro=jammyOther threatsAffected
  • <2.6+dfsg-1+deb11u1build0.22.04.1
Fixed in
  • 2.6+dfsg-1+deb11u1build0.22.04.1
Ubuntu Pro 20.04 LTSrearpkg:deb/ubuntu/rear?arch=source&distro=esm-apps/focalOther threatsAffected
  • <2.5+dfsg-1ubuntu0.1~esm1
Fixed in
  • 2.5+dfsg-1ubuntu0.1~esm1
Ubuntu Pro 18.04 LTSrearpkg:deb/ubuntu/rear?arch=source&distro=esm-apps/bionicOther threatsAffected
  • <2.3+dfsg-1ubuntu0.1~esm1
Fixed in
  • 2.3+dfsg-1ubuntu0.1~esm1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Apply the official patches provided by Ubuntu by updating rear to the fixed versions: 2.3+dfsg-1ubuntu0.1~esm1 for Ubuntu 18.04 LTS, 2.5+dfsg-1ubuntu0.1~esm1 for Ubuntu 20.04 LTS, and 2.6+dfsg-1+deb11u1build0.22.04.1 for Ubuntu 22.04 LTS. A standard system update will apply these fixes. Ubuntu Pro users can obtain fixes via Extended Security Maintenance (ESM).

Description

Relax-and-Recover (rear) versions prior to certain patched releases create a world-readable initrd when GRUB_RESCUE is enabled. This misconfiguration could allow a local attacker to access sensitive information. Fixes are available in updated package versions for Ubuntu 18.04 LTS, 20.04 LTS, and 22.04 LTS.

References

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