USN-8266-1: Linux kernel vulnerabilities

Published May 11, 2026
·
Updated

Qualys discovered that several vulnerabilities existed in the AppArmor Linux kernel Security Module (LSM). An unprivileged local attacker could use these issues to load, replace, and remove arbitrary AppArmor profiles causing denial of service, exposure of sensitive information (kernel memory), local privilege escalation, or possibly escape a container. (LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403, CVE-2026-23404, CVE-2026-23405, CVE-2026-23410, CVE-2026-23411)

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - GPU drivers; - Network drivers; - Sun RPC protocol; - XFRM subsystem; (CVE-2024-27388, CVE-2024-46816, CVE-2024-49938, CVE-2024-50008, CVE-2024-50142, CVE-2026-23209)

Affected Software

89 affected componentsFixes available
Linux Linux kernel
All of the following
ubuntu/linux-image-4.15.0-1146-fips<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1153-oracle<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1173-kvm<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1184-gcp<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1191-aws<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1200-azure<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-2092-gcp-fips<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-2129-aws-fips<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-249-generic<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-249-lowlatency<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-aws-4.15<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-aws-fips<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-aws-fips-4.15<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-aws-lts-18.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-azure-4.15<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-azure-lts-18.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-fips<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-gcp-4.15<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-gcp-fips<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-gcp-fips-4.15<FIPS-140
FIPS-140
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-gcp-lts-18.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-generic<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-kvm<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-lowlatency<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-oracle-4.15<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-oracle-lts-18.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-virtual<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/linux-image-4.15.0-1184-gcp<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-4.15.0-1191-aws<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-4.15.0-249-generic<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-4.15.0-249-lowlatency<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-aws-hwe<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-gcp<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-generic-hwe-16.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-gke<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-lowlatency-hwe-16.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-oem<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/linux-image-virtual-hwe-16.04<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
ubuntu/linux-aws-hwe<4.15.0-1191.204~16.04.1
4.15.0-1191.204~16.04.1
ubuntu/linux-gcp<4.15.0-1184.201~16.04.1
4.15.0-1184.201~16.04.1
ubuntu/linux-hwe<4.15.0-249.261~16.04.1
4.15.0-249.261~16.04.1
ubuntu/linux<4.15.0-249.261
4.15.0-249.261
ubuntu/linux-aws<4.15.0-1191.204
4.15.0-1191.204
ubuntu/linux-azure-4.15<4.15.0-1200.215
4.15.0-1200.215
ubuntu/linux-gcp-4.15<4.15.0-1184.201
4.15.0-1184.201
ubuntu/linux-kvm<4.15.0-1173.178
4.15.0-1173.178
ubuntu/linux-oracle<4.15.0-1153.164
4.15.0-1153.164
ubuntu/linux-aws-fips<4.15.0-2129.135
4.15.0-2129.135
ubuntu/linux-fips<4.15.0-1146.158
4.15.0-1146.158
ubuntu/linux-gcp-fips<4.15.0-2092.98
4.15.0-2092.98

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1146-fips to a version that resolves this vulnerability.

    Fixed in FIPS-140
  2. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1153-oracle to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  3. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1173-kvm to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  4. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1184-gcp to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  5. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1191-aws to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  6. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-1200-azure to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  7. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-2092-gcp-fips to a version that resolves this vulnerability.

    Fixed in FIPS-140
  8. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-2129-aws-fips to a version that resolves this vulnerability.

    Fixed in FIPS-140
  9. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-249-generic to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  10. Upgrade

    Upgrade ubuntu/linux-image-4.15.0-249-lowlatency to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  11. Upgrade

    Upgrade ubuntu/linux-image-aws-4.15 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  12. Upgrade

    Upgrade ubuntu/linux-image-aws-fips to a version that resolves this vulnerability.

    Fixed in FIPS-140
  13. Upgrade

    Upgrade ubuntu/linux-image-aws-fips-4.15 to a version that resolves this vulnerability.

    Fixed in FIPS-140
  14. Upgrade

    Upgrade ubuntu/linux-image-aws-lts-18.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  15. Upgrade

    Upgrade ubuntu/linux-image-azure-4.15 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  16. Upgrade

    Upgrade ubuntu/linux-image-azure-lts-18.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  17. Upgrade

    Upgrade ubuntu/linux-image-fips to a version that resolves this vulnerability.

    Fixed in FIPS-140
  18. Upgrade

    Upgrade ubuntu/linux-image-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  19. Upgrade

    Upgrade ubuntu/linux-image-gcp-fips to a version that resolves this vulnerability.

    Fixed in FIPS-140
  20. Upgrade

    Upgrade ubuntu/linux-image-gcp-fips-4.15 to a version that resolves this vulnerability.

    Fixed in FIPS-140
  21. Upgrade

    Upgrade ubuntu/linux-image-gcp-lts-18.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  22. Upgrade

    Upgrade ubuntu/linux-image-generic to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  23. Upgrade

    Upgrade ubuntu/linux-image-kvm to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  24. Upgrade

    Upgrade ubuntu/linux-image-lowlatency to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  25. Upgrade

    Upgrade ubuntu/linux-image-oracle-4.15 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  26. Upgrade

    Upgrade ubuntu/linux-image-oracle-lts-18.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  27. Upgrade

    Upgrade ubuntu/linux-image-virtual to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  28. Upgrade

    Upgrade ubuntu/linux-image-aws-hwe to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  29. Upgrade

    Upgrade ubuntu/linux-image-gcp to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  30. Upgrade

    Upgrade ubuntu/linux-image-generic-hwe-16.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  31. Upgrade

    Upgrade ubuntu/linux-image-gke to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  32. Upgrade

    Upgrade ubuntu/linux-image-lowlatency-hwe-16.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  33. Upgrade

    Upgrade ubuntu/linux-image-oem to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  34. Upgrade

    Upgrade ubuntu/linux-image-virtual-hwe-16.04 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  35. Upgrade

    Upgrade ubuntu/linux-aws-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-1191.204~16.04.1
  36. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.15.0-1184.201~16.04.1
  37. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.15.0-249.261~16.04.1
  38. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.15.0-249.261
  39. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.15.0-1191.204
  40. Upgrade

    Upgrade ubuntu/linux-azure-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1200.215
  41. Upgrade

    Upgrade ubuntu/linux-gcp-4.15 to a version that resolves this vulnerability.

    Fixed in 4.15.0-1184.201
  42. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.15.0-1173.178
  43. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 4.15.0-1153.164
  44. Upgrade

    Upgrade ubuntu/linux-aws-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2129.135
  45. Upgrade

    Upgrade ubuntu/linux-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-1146.158
  46. Upgrade

    Upgrade ubuntu/linux-gcp-fips to a version that resolves this vulnerability.

    Fixed in 4.15.0-2092.98
  47. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch USN-8266-1

Event History

May 11, 2026
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software
Advisory Published
via OSV·03:08 PM
Data Sourced
via OSV·03:08 PM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203