CVE-2026-31663: xfrm: hold dev ref until after transport_finish NF_HOOK

Overview

Severity

High (CVSS 7)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-26

Last Updated

2026-09-05

EPSS Score

0.12% (percentile: 2.4%)

Affected Products (12)

Open Source Software

• azl3 kernel 6.6.130.1-3 on Azure Linux 3.0
• azl3 kernel 6.6.134.1-2 on Azure Linux 3.0
• cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0

Other

• 21308-17084
• 21626-17084
• 21093-21692
• 21684-17084
• 21332-17084
• 21344-17084
• 21443-17084
• 21474-17084
• 21580-17084

Security Updates (1)

• Security Update

Revision History

• 2026-04-26: Information published.
• 2026-04-27: Information published.
• 2026-04-29: Information published.
• 2026-04-29: Information published.
• 2026-04-29: Information published.
• 2026-05-06: Information published.
• 2026-05-11: Information published.
• 2026-05-17: Information published.
• 2026-05-22: Information published.
• 2026-06-17: Information published.
• 2026-06-28: Information published.
• 2026-07-12: Information published.
• 2026-08-09: Information published.
• 2026-08-10: Information published.
• 2026-09-05: Information published.
• 2026-09-05: Information published.