USN-4984-1: Linux kernel vulnerabilities

Published Jun 8, 2021
·
Updated

Jan Beulich discovered that the Xen netback backend in the Linux kernel did not properly handle certain error conditions under paravirtualization. An attacker in a guest VM could possibly use this to cause a denial of service (host domain crash). (CVE-2021-28038) It was discovered that the Realtek RTL8188EU Wireless device driver in the Linux kernel did not properly validate ssid lengths in some situations. An attacker could use this to cause a denial of service (system crash). (CVE-2021-28660) It was discovered that the Xen paravirtualization backend in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-28688) It was discovered that the fuse user space file system implementation in the Linux kernel did not properly handle bad inodes in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2021-28950) John Stultz discovered that the audio driver for Qualcomm SDM845 systems in the Linux kernel did not properly validate port ID numbers. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28952) Zygo Blaxell discovered that the btrfs file system implementation in the Linux kernel contained a race condition during certain cloning operations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-28964) Vince Weaver discovered that the perf subsystem in the Linux kernel did not properly handle certain PEBS records properly for some Intel Haswell processors. A local attacker could use this to cause a denial of service (system crash). (CVE-2021-28971) It was discovered that the RPA PCI Hotplug driver implementation in the Linux kernel did not properly handle device name writes via sysfs, leading to a buffer overflow. A privileged attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-28972) It was discovered that the Qualcomm IPC router implementation in the Linux kernel did not properly initialize memory passed to user space. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-29647) Arnd Bergmann discovered that the video4linux subsystem in the Linux kernel did not properly deallocate memory in some situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-30002) Dan Carpenter discovered that the block device manager (dm) implementation in the Linux kernel contained a buffer overflow in the ioctl for listing devices. A privileged local attacker could use this to cause a denial of service (system crash). (CVE-2021-31916) It was discovered that the CIPSO implementation in the Linux kernel did not properly perform reference counting in some situations, leading to use- after-free vulnerabilities. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33033) 马哲宇 discovered that the IEEE 1394 (Firewire) nosy packet sniffer driver in the Linux kernel did not properly perform reference counting in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3483)

Affected Software

67 affected componentsFixes available
Canonical Linux kernel
All of the following
ubuntu/linux-image-5.8.0-1026-raspi<5.8.0-1026.29
5.8.0-1026.29
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1026-raspi-nolpae<5.8.0-1026.29
5.8.0-1026.29
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1028-kvm<5.8.0-1028.30
5.8.0-1028.30
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1031-oracle<5.8.0-1031.32
5.8.0-1031.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1032-gcp<5.8.0-1032.34
5.8.0-1032.34
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1033-azure<5.8.0-1033.35
5.8.0-1033.35
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-1035-aws<5.8.0-1035.37
5.8.0-1035.37
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-55-generic<5.8.0-55.62
5.8.0-55.62
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-55-generic-64k<5.8.0-55.62
5.8.0-55.62
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-55-generic-lpae<5.8.0-55.62
5.8.0-55.62
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-55-lowlatency<5.8.0-55.62
5.8.0-55.62
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-aws<5.8.0.1035.37
5.8.0.1035.37
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-azure<5.8.0.1033.33
5.8.0.1033.33
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-gcp<5.8.0.1032.32
5.8.0.1032.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-generic<5.8.0.55.60
5.8.0.55.60
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-generic-64k<5.8.0.55.60
5.8.0.55.60
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-generic-lpae<5.8.0.55.60
5.8.0.55.60
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-gke<5.8.0.1032.32
5.8.0.1032.32
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-kvm<5.8.0.1028.30
5.8.0.1028.30
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-lowlatency<5.8.0.55.60
5.8.0.55.60
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-oracle<5.8.0.1031.30
5.8.0.1031.30
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-raspi<5.8.0.1026.29
5.8.0.1026.29
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-raspi-nolpae<5.8.0.1026.29
5.8.0.1026.29
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-virtual<5.8.0.55.60
5.8.0.55.60
Ubuntu Ubuntu=20.10
All of the following
ubuntu/linux-image-5.8.0-55-generic<5.8.0-55.62~20.04.1
5.8.0-55.62~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-55-generic-64k<5.8.0-55.62~20.04.1
5.8.0-55.62~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-55-generic-lpae<5.8.0-55.62~20.04.1
5.8.0-55.62~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-5.8.0-55-lowlatency<5.8.0-55.62~20.04.1
5.8.0-55.62~20.04.1
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-generic-64k-hwe-20.04<5.8.0.55.62~20.04.39
5.8.0.55.62~20.04.39
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-generic-hwe-20.04<5.8.0.55.62~20.04.39
5.8.0.55.62~20.04.39
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-generic-lpae-hwe-20.04<5.8.0.55.62~20.04.39
5.8.0.55.62~20.04.39
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-lowlatency-hwe-20.04<5.8.0.55.62~20.04.39
5.8.0.55.62~20.04.39
Ubuntu Ubuntu=20.04
All of the following
ubuntu/linux-image-virtual-hwe-20.04<5.8.0.55.62~20.04.39
5.8.0.55.62~20.04.39
Ubuntu Ubuntu=20.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1026-raspi to a version that resolves this vulnerability.

    Fixed in 5.8.0-1026.29
  2. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1026-raspi-nolpae to a version that resolves this vulnerability.

    Fixed in 5.8.0-1026.29
  3. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1028-kvm to a version that resolves this vulnerability.

    Fixed in 5.8.0-1028.30
  4. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1031-oracle to a version that resolves this vulnerability.

    Fixed in 5.8.0-1031.32
  5. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-1032-gcp to a version that resolves this vulnerability.

    Fixed in 5.8.0-1032.34
  6. Upgrade

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

    Fixed in 5.8.0-1033.35
  7. Upgrade

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

    Fixed in 5.8.0-1035.37
  8. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-generic to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62
  9. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62
  10. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-generic-lpae to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62
  11. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62
  12. Upgrade

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

    Fixed in 5.8.0.1035.37
  13. Upgrade

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

    Fixed in 5.8.0.1033.33
  14. Upgrade

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

    Fixed in 5.8.0.1032.32
  15. Upgrade

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

    Fixed in 5.8.0.55.60
  16. Upgrade

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

    Fixed in 5.8.0.55.60
  17. Upgrade

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

    Fixed in 5.8.0.55.60
  18. Upgrade

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

    Fixed in 5.8.0.1032.32
  19. Upgrade

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

    Fixed in 5.8.0.1028.30
  20. Upgrade

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

    Fixed in 5.8.0.55.60
  21. Upgrade

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

    Fixed in 5.8.0.1031.30
  22. Upgrade

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

    Fixed in 5.8.0.1026.29
  23. Upgrade

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

    Fixed in 5.8.0.1026.29
  24. Upgrade

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

    Fixed in 5.8.0.55.60
  25. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-generic to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62~20.04.1
  26. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-generic-64k to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62~20.04.1
  27. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-generic-lpae to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62~20.04.1
  28. Upgrade

    Upgrade ubuntu/linux-image-5.8.0-55-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.8.0-55.62~20.04.1
  29. Upgrade

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

    Fixed in 5.8.0.55.62~20.04.39
  30. Upgrade

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

    Fixed in 5.8.0.55.62~20.04.39
  31. Upgrade

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

    Fixed in 5.8.0.55.62~20.04.39
  32. Upgrade

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

    Fixed in 5.8.0.55.62~20.04.39
  33. Upgrade

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

    Fixed in 5.8.0.55.62~20.04.39

Event History

Jun 8, 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-4984-1?

The severity of USN-4984-1 is considered high due to the potential for a denial of service attack causing host domain crashes.

2

How do I fix USN-4984-1?

To fix USN-4984-1, update to the latest kernel version as specified in the Ubuntu advisory.

3

What systems are affected by USN-4984-1?

USN-4984-1 affects Ubuntu 20.10 systems running specific versions of the Linux kernel image.

4

Can USN-4984-1 be exploited remotely?

Yes, an attacker in a guest VM could exploit USN-4984-1 to crash the host domain.

5

What components are involved in USN-4984-1?

The vulnerability involves the Xen netback backend in the Linux kernel under paravirtualization.

Company

Resources

Contact

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