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SUSE: CVE-2021-46904: SUSE Linux Security Advisory

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SUSE: CVE-2021-46904: SUSE Linux Security Advisory

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
02/26/2024
Created
08/16/2024
Added
08/09/2024
Modified
01/28/2025

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)

  • suse-upgrade-kernel-64kb
  • suse-upgrade-kernel-64kb-devel
  • suse-upgrade-kernel-azure
  • suse-upgrade-kernel-azure-base
  • suse-upgrade-kernel-azure-devel
  • suse-upgrade-kernel-default
  • suse-upgrade-kernel-default-base
  • suse-upgrade-kernel-default-devel
  • suse-upgrade-kernel-default-extra
  • suse-upgrade-kernel-default-man
  • suse-upgrade-kernel-devel
  • suse-upgrade-kernel-devel-azure
  • suse-upgrade-kernel-docs
  • suse-upgrade-kernel-ec2
  • suse-upgrade-kernel-ec2-base
  • suse-upgrade-kernel-ec2-devel
  • suse-upgrade-kernel-macros
  • suse-upgrade-kernel-obs-build
  • suse-upgrade-kernel-preempt
  • suse-upgrade-kernel-preempt-devel
  • suse-upgrade-kernel-source
  • suse-upgrade-kernel-source-azure
  • suse-upgrade-kernel-syms
  • suse-upgrade-kernel-syms-azure
  • suse-upgrade-kernel-trace
  • suse-upgrade-kernel-trace-base
  • suse-upgrade-kernel-trace-devel
  • suse-upgrade-kernel-xen
  • suse-upgrade-kernel-xen-base
  • suse-upgrade-kernel-xen-devel
  • suse-upgrade-kernel-zfcpdump
  • suse-upgrade-reiserfs-kmp-default

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