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VulnerabilityPublished Updated

CVE-2026-31431: linux-azure-4.15, linux-azure-fips vulnerabilities

Affects Linux kernelSource GCVE Database

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Exploited in the wild · KEV due 15 May 2026 · public exploit available (Metasploit) · fixed in 4.15.0-1201.216 : patch Linux kernel now.

Data as of 5 Nov 2026, 22:21 UTC

Exploitation

Actively exploited

High severity · No CVSS score from NVD or the CNA

KEV deadline
 US federal agencies must patch by this date; a sensible deadline for everyone else. Other KEV due dates
Patch
Available – fixed in 4.15.0-1201.216, 4.15.0-2110.116

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

  1. Disclosed: evidence found.

    CVE published 22 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: evidence found.

    1 Metasploit module

  4. Exploited in the wild: evidence found.

    Listed in CISA KEV 21 days before disclosure

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

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. , 21 days before disclosure

  2. KEV remediation due

    US federal deadline

    , 7 days before disclosure

  3. CVE published

    on cve.org

    , t = 0

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA KEV (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade the Ubuntu to 4.15.0-1201.216 (linux-azure-4.15 package) or 4.15.0-2110.116 (linux-azure-fips package).

Affected software

ProductAffectedFixed in
Ubuntu Pro 18.04 LTSlinux-azure-4.15pkg:deb/ubuntu/linux-azure-4.15?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <4.15.0-1201.216
Fixed in
  • 4.15.0-1201.216
Ubuntu Pro FIPS-updates 18.04 LTSlinux-azure-fipspkg:deb/ubuntu/linux-azure-fips?arch=source&distro=fips-updates/bionicOther threatsAffected
  • <4.15.0-2110.116
Fixed in
  • 4.15.0-2110.116

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

Description

A vulnerability in the Linux kernel algif_aead module (CVE-2026-31431) allows improper handling of in-place cryptographic operations, known as Copy Fail. This flaw enables a local attacker to escalate privileges or potentially escape a container. The issue affects the linux-azure-4.15 kernel and related FIPS variants. Multiple security issues in cryptographic API and packet sockets subsystems were also addressed in the same update. Fixes are available and require system updates and reboot.

References

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