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Red Hat: CVE-2023-4206: kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route (Multiple Advisories)

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Red Hat: CVE-2023-4206: kernel: net/sched: Use-after-free vulnerabilities in the net/sched classifiers: cls_fw, cls_u32 and cls_route (Multiple Advisories)

Severity
7
CVSS
(AV:L/AC:L/Au:S/C:C/I:C/A:C)
Published
09/06/2023
Created
11/09/2023
Added
11/08/2023
Modified
01/30/2025

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.

Solution(s)

  • redhat-upgrade-kernel
  • redhat-upgrade-kernel-rt

References

  • CVE-2023-4206
  • RHSA-2023:6583
  • RHSA-2023:6901
  • RHSA-2023:7077
  • RHSA-2023:7370
  • RHSA-2023:7379
  • RHSA-2023:7418
  • RHSA-2023:7419
  • RHSA-2023:7423
  • RHSA-2023:7424
  • RHSA-2023:7539
  • RHSA-2023:7558
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