USN-4999-1: Linux kernel vulnerabilities

Published Jun 23, 2021
·
Updated

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609) Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25670) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-25671, CVE-2020-25672) Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly handle error conditions in some situations, leading to an infinite loop. A local attacker could use this to cause a denial of service. (CVE-2020-25673) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation accepted plaintext fragments in certain situations. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145) Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could reassemble mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147) Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133) Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. (CVE-2021-29155) Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel contained an out-of-bounds vulnerability. A local attacker could use this issue to execute arbitrary code. (CVE-2021-31440) Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829)

Affected Software

83 affected componentsFixes available
Canonical Linux kernel
All of the following
ubuntu/linux-image-5.8.0-59-lowlatency<5.8.0-59.66
5.8.0-59.66
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1029-raspi<5.8.0-1029.32
5.8.0-1029.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1038-aws<5.8.0-1038.40
5.8.0-1038.40
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-oracle<5.8.0.1033.32
5.8.0.1033.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-azure<5.8.0.1036.36
5.8.0.1036.36
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-raspi-nolpae<5.8.0.1029.31
5.8.0.1029.31
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-59-generic-64k<5.8.0-59.66
5.8.0-59.66
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-59-generic-lpae<5.8.0-59.66
5.8.0-59.66
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-virtual<5.8.0.59.64
5.8.0.59.64
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-raspi<5.8.0.1029.31
5.8.0.1029.31
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-gke<5.8.0.1035.35
5.8.0.1035.35
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-generic-64k<5.8.0.59.64
5.8.0.59.64
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-generic<5.8.0.59.64
5.8.0.59.64
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1036-azure<5.8.0-1036.38
5.8.0-1036.38
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1033-oracle<5.8.0-1033.34
5.8.0-1033.34
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-aws<5.8.0.1038.40
5.8.0.1038.40
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-kvm<5.8.0.1030.32
5.8.0.1030.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1030-kvm<5.8.0-1030.32
5.8.0-1030.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-generic-lpae<5.8.0.59.64
5.8.0.59.64
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-gcp<5.8.0.1035.35
5.8.0.1035.35
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1029-raspi-nolpae<5.8.0-1029.32
5.8.0-1029.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1035-gcp<5.8.0-1035.37
5.8.0-1035.37
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-59-generic<5.8.0-59.66
5.8.0-59.66
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-lowlatency<5.8.0.59.64
5.8.0.59.64
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-virtual-hwe-20.04<5.8.0.59.66~20.04.42
5.8.0.59.66~20.04.42
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-59-generic-64k<5.8.0-59.66~20.04.1
5.8.0-59.66~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-59-lowlatency<5.8.0-59.66~20.04.1
5.8.0-59.66~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-generic-lpae-hwe-20.04<5.8.0.59.66~20.04.42
5.8.0.59.66~20.04.42
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-59-generic<5.8.0-59.66~20.04.1
5.8.0-59.66~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-gcp<5.8.0.1035.37~20.04.9
5.8.0.1035.37~20.04.9
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-generic-64k-hwe-20.04<5.8.0.59.66~20.04.42
5.8.0.59.66~20.04.42
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-1036-azure<5.8.0-1036.38~20.04.1
5.8.0-1036.38~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-1033-oracle<5.8.0-1033.34~20.04.1
5.8.0-1033.34~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-lowlatency-hwe-20.04<5.8.0.59.66~20.04.42
5.8.0.59.66~20.04.42
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-1035-gcp<5.8.0-1035.37~20.04.1
5.8.0-1035.37~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-aws<5.8.0.1038.40~20.04.11
5.8.0.1038.40~20.04.11
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-generic-hwe-20.04<5.8.0.59.66~20.04.42
5.8.0.59.66~20.04.42
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-1038-aws<5.8.0-1038.40~20.04.1
5.8.0-1038.40~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-59-generic-lpae<5.8.0-59.66~20.04.1
5.8.0-59.66~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-oracle<5.8.0.1033.34~20.04.9
5.8.0.1033.34~20.04.9
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-azure<5.8.0.1036.38~20.04.8
5.8.0.1036.38~20.04.8
Ubuntu Ubuntu=20.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66
  2. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1029-raspi to a version that resolves this vulnerability.

    Fixed in 5.8.0-1029.32
  3. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1038-aws to a version that resolves this vulnerability.

    Fixed in 5.8.0-1038.40
  4. Upgrade

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

    Fixed in 5.8.0.1033.32
  5. Upgrade

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

    Fixed in 5.8.0.1036.36
  6. Upgrade

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

    Fixed in 5.8.0.1029.31
  7. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66
  8. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-generic-lpae to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66
  9. Upgrade

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

    Fixed in 5.8.0.59.64
  10. Upgrade

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

    Fixed in 5.8.0.1029.31
  11. Upgrade

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

    Fixed in 5.8.0.1035.35
  12. Upgrade

    Upgrade ubuntu/linux-image-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.8.0.59.64
  13. Upgrade

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

    Fixed in 5.8.0.59.64
  14. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1036-azure to a version that resolves this vulnerability.

    Fixed in 5.8.0-1036.38
  15. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1033-oracle to a version that resolves this vulnerability.

    Fixed in 5.8.0-1033.34
  16. Upgrade

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

    Fixed in 5.8.0.1038.40
  17. Upgrade

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

    Fixed in 5.8.0.1030.32
  18. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1030-kvm to a version that resolves this vulnerability.

    Fixed in 5.8.0-1030.32
  19. Upgrade

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

    Fixed in 5.8.0.59.64
  20. Upgrade

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

    Fixed in 5.8.0.1035.35
  21. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1029-raspi-nolpae to a version that resolves this vulnerability.

    Fixed in 5.8.0-1029.32
  22. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1035-gcp to a version that resolves this vulnerability.

    Fixed in 5.8.0-1035.37
  23. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-generic to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66
  24. Upgrade

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

    Fixed in 5.8.0.59.64
  25. Upgrade

    Upgrade ubuntu/linux-image-virtual-hwe-20.04 to a version that resolves this vulnerability.

    Fixed in 5.8.0.59.66~20.04.42
  26. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66~20.04.1
  27. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66~20.04.1
  28. Upgrade

    Upgrade ubuntu/linux-image-generic-lpae-hwe-20.04 to a version that resolves this vulnerability.

    Fixed in 5.8.0.59.66~20.04.42
  29. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-generic to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66~20.04.1
  30. Upgrade

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

    Fixed in 5.8.0.1035.37~20.04.9
  31. Upgrade

    Upgrade ubuntu/linux-image-generic-64k-hwe-20.04 to a version that resolves this vulnerability.

    Fixed in 5.8.0.59.66~20.04.42
  32. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1036-azure to a version that resolves this vulnerability.

    Fixed in 5.8.0-1036.38~20.04.1
  33. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1033-oracle to a version that resolves this vulnerability.

    Fixed in 5.8.0-1033.34~20.04.1
  34. Upgrade

    Upgrade ubuntu/linux-image-lowlatency-hwe-20.04 to a version that resolves this vulnerability.

    Fixed in 5.8.0.59.66~20.04.42
  35. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1035-gcp to a version that resolves this vulnerability.

    Fixed in 5.8.0-1035.37~20.04.1
  36. Upgrade

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

    Fixed in 5.8.0.1038.40~20.04.11
  37. Upgrade

    Upgrade ubuntu/linux-image-generic-hwe-20.04 to a version that resolves this vulnerability.

    Fixed in 5.8.0.59.66~20.04.42
  38. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1038-aws to a version that resolves this vulnerability.

    Fixed in 5.8.0-1038.40~20.04.1
  39. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-59-generic-lpae to a version that resolves this vulnerability.

    Fixed in 5.8.0-59.66~20.04.1
  40. Upgrade

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

    Fixed in 5.8.0.1033.34~20.04.9
  41. Upgrade

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

    Fixed in 5.8.0.1036.38~20.04.8

Event History

Jun 23, 2021
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of USN-4999-1?

The severity of USN-4999-1 is classified as high due to the potential for local attackers to execute arbitrary code.

2

How do I fix USN-4999-1?

To fix USN-4999-1, users should update their system packages to the latest recommended versions as specified in the advisory.

3

Which Ubuntu versions are affected by USN-4999-1?

USN-4999-1 affects Ubuntu 20.10, specifically targeting various kernel image packages.

4

What vulnerabilities are addressed in USN-4999-1?

USN-4999-1 addresses multiple use-after-free vulnerabilities related to a race condition in the Linux kernel's CAN BCM networking protocol.

5

Can I check if my system is vulnerable to USN-4999-1?

You can check if your system is vulnerable to USN-4999-1 by reviewing the installed kernel version against the versions listed in the security advisory.

Company

Resources

Contact

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