F5-K000138693: Use After Free

First published: Fri Feb 23 2024(Updated: )

CVE-2023-4206 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. CVE-2023-4207 A use-after-free vulnerability in the Linux kernel's net/sched: cls_fw component can be exploited to achieve local privilege escalation. When fw_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 76e42ae831991c828cffa8c37736ebfb831ad5ec. CVE-2023-4208 A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. When u32_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 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

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• collector/f5-advisory
• source/F5
• alias/CVE-2023-4206
• alias/CVE-2023-4207
• alias/CVE-2023-4208
• agent/software-canonical-lookup
• agent/software-canonical-lookup-request
• agent/severity
• agent/references
• agent/last-modified-date
• agent/weakness
• agent/type
• agent/description
• agent/first-publish-date
• agent/softwarecombine
• agent/event
• agent/tags
• vendor/f5
• canonical/f5 traffix sdc
• version/f5 traffix sdc/1
• version/f5 traffix sdc/5
• version/f5 traffix sdc/5.2.0