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Ubuntu: (CVE-2021-47361): linux vulnerability

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Ubuntu: (CVE-2021-47361): linux vulnerability

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
05/21/2024
Created
11/21/2024
Added
11/19/2024
Modified
02/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus.This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.

Solution(s)

  • ubuntu-upgrade-linux
  • ubuntu-upgrade-linux-aws
  • ubuntu-upgrade-linux-aws-5-4
  • ubuntu-upgrade-linux-aws-fips
  • ubuntu-upgrade-linux-aws-hwe
  • ubuntu-upgrade-linux-azure
  • ubuntu-upgrade-linux-azure-4-15
  • ubuntu-upgrade-linux-azure-5-4
  • ubuntu-upgrade-linux-azure-fips
  • ubuntu-upgrade-linux-bluefield
  • ubuntu-upgrade-linux-fips
  • ubuntu-upgrade-linux-gcp
  • ubuntu-upgrade-linux-gcp-4-15
  • ubuntu-upgrade-linux-gcp-5-4
  • ubuntu-upgrade-linux-gcp-fips
  • ubuntu-upgrade-linux-gkeop
  • ubuntu-upgrade-linux-hwe
  • ubuntu-upgrade-linux-hwe-5-4
  • ubuntu-upgrade-linux-ibm
  • ubuntu-upgrade-linux-kvm
  • ubuntu-upgrade-linux-oracle
  • ubuntu-upgrade-linux-oracle-5-4
  • ubuntu-upgrade-linux-raspi
  • ubuntu-upgrade-linux-raspi-5-4

References

  • https://attackerkb.com/topics/cve-2021-47361
  • CVE - 2021-47361
  • https://git.kernel.org/linus/25a1433216489de4abc889910f744e952cb6dbae
  • https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f
  • https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae
  • https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b
  • https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0
  • https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aea
  • https://git.kernel.org/stable/c/91e4ad05bf18322b5921d1a6c9b603f6eb1694f0
  • https://git.kernel.org/stable/c/9fc198f415dee070a1de957bb5bf5921d8df3499
  • https://www.cve.org/CVERecord?id=CVE-2021-47361
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