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Amazon Linux AMI 2: CVE-2022-48988: Security patch for kernel (Multiple Advisories)

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Amazon Linux AMI 2: CVE-2022-48988: Security patch for kernel (Multiple Advisories)

Severity
7
CVSS
(AV:L/AC:M/Au:S/C:C/I:C/A:C)
Published
10/21/2024
Created
01/23/2025
Added
01/22/2025
Modified
01/30/2025

Description

In the Linux kernel, the following vulnerability has been resolved: memcg: fix possible use-after-free in memcg_write_event_control() memcg_write_event_control() accesses the dentry->d_name of the specified control fd to route the write call.As a cgroup interface file can't be renamed, it's safe to access d_name as long as the specified file is a regular cgroup file.Also, as these cgroup interface files can't be removed before the directory, it's safe to access the parent too. Prior to 347c4a874710 ("memcg: remove cgroup_event->cft"), there was a call to __file_cft() which verified that the specified file is a regular cgroupfs file before further accesses.The cftype pointer returned from __file_cft() was no longer necessary and the commit inadvertently dropped the file type check with it allowing any file to slip through.With the invarients broken, the d_name and parent accesses can now race against renames and removals of arbitrary files and cause use-after-free's. Fix the bug by resurrecting the file type check in __file_cft().Now that cgroupfs is implemented through kernfs, checking the file operations needs to go through a layer of indirection.Instead, let's check the superblock and dentry type.

Solution(s)

  • amazon-linux-ami-2-upgrade-bpftool
  • amazon-linux-ami-2-upgrade-bpftool-debuginfo
  • amazon-linux-ami-2-upgrade-kernel
  • amazon-linux-ami-2-upgrade-kernel-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-debuginfo-common-aarch64
  • amazon-linux-ami-2-upgrade-kernel-debuginfo-common-x86_64
  • amazon-linux-ami-2-upgrade-kernel-devel
  • amazon-linux-ami-2-upgrade-kernel-headers
  • amazon-linux-ami-2-upgrade-kernel-livepatch-4-14-304-226-531
  • amazon-linux-ami-2-upgrade-kernel-livepatch-5-10-162-141-675
  • amazon-linux-ami-2-upgrade-kernel-livepatch-5-15-86-53-137
  • amazon-linux-ami-2-upgrade-kernel-tools
  • amazon-linux-ami-2-upgrade-kernel-tools-debuginfo
  • amazon-linux-ami-2-upgrade-kernel-tools-devel
  • amazon-linux-ami-2-upgrade-perf
  • amazon-linux-ami-2-upgrade-perf-debuginfo
  • amazon-linux-ami-2-upgrade-python-perf
  • amazon-linux-ami-2-upgrade-python-perf-debuginfo

References

  • https://attackerkb.com/topics/cve-2022-48988
  • AL2/ALAS-2023-1932
  • AL2/ALASKERNEL-5.10-2023-025
  • AL2/ALASKERNEL-5.15-2023-012
  • AL2/ALASKERNEL-5.4-2023-041
  • CVE - 2022-48988
  • 查看数 701
  • 已创建
  • 最后回复

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