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Ubuntu: (Multiple Advisories) (CVE-2021-46904): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2021-46904): Linux kernel vulnerabilities

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
02/26/2024
Created
08/23/2024
Added
08/22/2024
Modified
01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.

Solution(s)

  • ubuntu-upgrade-linux-image-3-13-0-199-generic
  • ubuntu-upgrade-linux-image-3-13-0-199-lowlatency
  • ubuntu-upgrade-linux-image-4-4-0-1135-aws
  • ubuntu-upgrade-linux-image-4-4-0-1136-kvm
  • ubuntu-upgrade-linux-image-4-4-0-1173-aws
  • ubuntu-upgrade-linux-image-4-4-0-258-generic
  • ubuntu-upgrade-linux-image-4-4-0-258-lowlatency
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-lts-trusty
  • ubuntu-upgrade-linux-image-generic-lts-xenial
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-lts-xenial
  • ubuntu-upgrade-linux-image-server
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-lts-xenial

References

  • https://attackerkb.com/topics/cve-2021-46904
  • CVE - 2021-46904
  • USN-6971-1
  • USN-6976-1
  • 查看数 711
  • 已创建
  • 最后回复

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