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VulnerabilityPublished Updated

CVE-2024-58240: Linux kernel · tls: separate no-async decryption request handling from async

Affects Linux kernelSource GCVE Database

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Not known to be exploited · CVSS 9.8 Critical · fixed in 5.4.0-1135.145~18.04.1 : patch Linux kernel as a priority.

Data as of 3 Nov 2026, 17:38 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 5.4.0-1135.145~18.04.1, 5.4.0-1140.147~18.04.1, 5.4.0-1139.148~18.04.1 +51
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 28 Aug 2025

  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 to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 24.04 LTSlinux-azure-6.11pkg:deb/ubuntu/linux-azure-6.11?arch=source&distro=nobleOther threatsAffected
  • 6.11.0-1008.8~24.04.1 – 6.11.0-1018.18~24.04.1
7 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-gcp-6.11pkg:deb/ubuntu/linux-gcp-6.11?arch=source&distro=nobleOther threatsAffected
  • 6.11.0-1006.6~24.04.2 – 6.11.0-1017.17~24.04.1
7 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-hwe-6.11pkg:deb/ubuntu/linux-hwe-6.11?arch=source&distro=nobleOther threatsAffected
  • 6.11.0-17.17~24.04.2 – 6.11.0-29.29~24.04.1
8 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-intelpkg:deb/ubuntu/linux-intel?arch=source&distro=nobleOther threatsAffected
  • =6.8.0-1005.12
  • =6.8.0-1006.13
  • =6.8.0-1007.14
Fixed in–
Ubuntu 24.04 LTSlinux-lowlatency-hwe-6.11pkg:deb/ubuntu/linux-lowlatency-hwe-6.11?arch=source&distro=nobleOther threatsAffected
  • 6.11.0-1009.10~24.04.1 – 6.11.0-1016.17~24.04.1
7 affected builds
Fixed in–
Ubuntu 24.04 LTSlinux-oem-6.8pkg:deb/ubuntu/linux-oem-6.8?arch=source&distro=nobleOther threatsAffected
  • 6.8.0-1003.3 – 6.8.0-1032.32
26 affected builds
Fixed in–

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

AI-suggested

A patch is available and should be applied promptly. Fixed versions include Linux kernel releases 5.4.0-1135.145~18.04.1 and later, among others listed in the established facts. Users and administrators should upgrade to these fixed kernel versions to remediate the vulnerability. No additional mitigation steps are indicated by the vendor advisory.

Description

CVE-2024-58240 is a critical vulnerability in the Linux kernel's TLS implementation related to handling decryption requests without asynchronous processing. The flaw involves improper separation of no-async and async decryption request handling, which has been corrected to simplify processing and avoid potential race conditions. The vulnerability has a CVSS score of 9.8, indicating severe impact on confidentiality, integrity, and availability. Multiple Linux kernel versions prior to 5.4.0-1135.145~18.04.1 and specific older versions are affected. A fix is available in several updated kernel releases.

Reports on CVE-2024-58240

References

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