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CVE-2026-31431VulnerabilityPublished Updated

linux, linux-aws, linux-aws-fips, linux-fips, linux-gcp-4.15, linux-gcp-fips, linux-kvm, linux-oracle vulnerabilities

Affects Linux kernelSource GCVE Database

0
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Mentioned vulnerabilities

Exploited in the wild · KEV due 15 May 2026 · public exploit available (Metasploit) · fixed in 4.15.0-250.262 : 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 4.15.0-250.262, 4.15.0-1192.205, 4.15.0-1185.202 +5

Exploitation evidence

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

  1. Disclosed: evidence found.

    CVE published 19 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 18 days before disclosure

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

    No attack traffic recorded by OffSeq Mirage sensors

Timeline

  1. , 18 days before disclosure

  2. KEV remediation due

    US federal deadline

    , 4 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 to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu Pro 18.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <4.15.0-250.262
Fixed in
  • 4.15.0-250.262
Ubuntu Pro 18.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <4.15.0-1192.205
Fixed in
  • 4.15.0-1192.205
Ubuntu Pro 18.04 LTSlinux-gcp-4.15pkg:deb/ubuntu/linux-gcp-4.15?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <4.15.0-1185.202
Fixed in
  • 4.15.0-1185.202
Ubuntu Pro 18.04 LTSlinux-kvmpkg:deb/ubuntu/linux-kvm?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <4.15.0-1174.179
Fixed in
  • 4.15.0-1174.179
Ubuntu Pro 18.04 LTSlinux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <4.15.0-1154.165
Fixed in
  • 4.15.0-1154.165
Ubuntu Pro FIPS-updates 18.04 LTSlinux-aws-fipspkg:deb/ubuntu/linux-aws-fips?arch=source&distro=fips-updates/bionicOther threatsAffected
  • <4.15.0-2130.136
Fixed in
  • 4.15.0-2130.136

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

Description

Multiple security vulnerabilities were discovered in the Linux kernel, including a flaw in the algif_aead module that improperly handles in-place cryptographic operations (CVE-2026-31431). This flaw, known as Copy Fail, could allow a local attacker to escalate privileges or escape a container. Additional issues affect the Cryptographic API and Packet sockets subsystems. These vulnerabilities could potentially be exploited to compromise the system. Fixes are available in updated Linux kernel packages, and a system reboot is required after applying updates.

References

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