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Ubuntu: (Multiple Advisories) (CVE-2021-3491): Linux kernel (OEM) vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2021-3491): Linux kernel (OEM) vulnerabilities

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
05/11/2021
Created
05/14/2021
Added
05/12/2021
Modified
03/22/2023

Description

The io_uring subsystem in the Linux kernel allowed the MAX_RW_COUNT limit to be bypassed in the PROVIDE_BUFFERS operation, which led to negative values being usedin mem_rw when reading /proc/<PID>/mem. This could be used to create a heap overflow leading to arbitrary code execution in the kernel. It was addressed via commit d1f82808877b ("io_uring: truncate lengths larger than MAX_RW_COUNT on provide buffers") (v5.13-rc1) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. It was introduced in ddf0322db79c ("io_uring: add IORING_OP_PROVIDE_BUFFERS") (v5.7-rc1).

Solution(s)

  • ubuntu-upgrade-linux-image-5-10-0-1026-oem
  • ubuntu-upgrade-linux-image-5-11-0-1005-azure
  • ubuntu-upgrade-linux-image-5-11-0-1006-oracle
  • ubuntu-upgrade-linux-image-5-11-0-1007-aws
  • ubuntu-upgrade-linux-image-5-11-0-1007-gcp
  • ubuntu-upgrade-linux-image-5-11-0-1007-kvm
  • ubuntu-upgrade-linux-image-5-11-0-1008-raspi
  • ubuntu-upgrade-linux-image-5-11-0-1008-raspi-nolpae
  • ubuntu-upgrade-linux-image-5-11-0-17-generic
  • ubuntu-upgrade-linux-image-5-11-0-17-generic-64k
  • ubuntu-upgrade-linux-image-5-11-0-17-generic-lpae
  • ubuntu-upgrade-linux-image-5-11-0-17-lowlatency
  • ubuntu-upgrade-linux-image-5-8-0-1024-raspi
  • ubuntu-upgrade-linux-image-5-8-0-1024-raspi-nolpae
  • ubuntu-upgrade-linux-image-5-8-0-1027-kvm
  • ubuntu-upgrade-linux-image-5-8-0-1029-oracle
  • ubuntu-upgrade-linux-image-5-8-0-1031-gcp
  • ubuntu-upgrade-linux-image-5-8-0-1032-azure
  • ubuntu-upgrade-linux-image-5-8-0-1033-aws
  • ubuntu-upgrade-linux-image-5-8-0-53-generic
  • ubuntu-upgrade-linux-image-5-8-0-53-generic-64k
  • ubuntu-upgrade-linux-image-5-8-0-53-generic-lpae
  • ubuntu-upgrade-linux-image-5-8-0-53-lowlatency
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-64k
  • ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
  • ubuntu-upgrade-linux-image-oem-20-04
  • ubuntu-upgrade-linux-image-oem-20-04b
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-raspi-nolpae
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-20-04

References

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