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Oracle Linux: CVE-2023-4206: ELSA-2023-12842: Unbreakable Enterprise kernel security update (IMPORTANT) (Multiple Advisories)

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Oracle Linux: CVE-2023-4206: ELSA-2023-12842: Unbreakable Enterprise kernel security update (IMPORTANT) (Multiple Advisories)

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
07/29/2023
Created
10/04/2023
Added
10/03/2023
Modified
01/23/2025

Description

A use-after-free vulnerability in the Linux kernel's net/sched: cls_route component can be exploited to achieve local privilege escalation. When route4_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free. We recommend upgrading past commit b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8. There are 3 CVEs for the use-after-free flaw found in net/sched/cls_fw.c in classifiers (cls_fw, cls_u32, and cls_route) in the Linux Kernel: CVE-2023-4206, CVE-2023-4207, CVE-2023-4208. A local user could use any of these flaws to crash the system or potentially escalate their privileges on the system. Similar CVE-2023-4128 was rejected as a duplicate.

Solution(s)

  • oracle-linux-upgrade-kernel
  • oracle-linux-upgrade-kernel-uek

References

  • https://attackerkb.com/topics/cve-2023-4206
  • CVE - 2023-4206
  • ELSA-2023-12842
  • ELSA-2023-7077
  • ELSA-2023-7423
  • ELSA-2023-6583
  • 查看数 703
  • 已创建
  • 最后回复

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