Use After Free Affecting kernel package, versions <0:4.14.322-244.536.amzn2
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Test your applications- Snyk ID SNYK-AMZN2-KERNEL-5936188
- published 6 Oct 2023
- disclosed 6 Sep 2023
Introduced: 6 Sep 2023
CVE-2023-4206 Open this link in a new tabHow to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.322-244.536.amzn2 or higher.
This issue was patched in ALAS2-2023-2268.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
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.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4206
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8
- https://kernel.dance/b80b829e9e2c1b3f7aae34855e04d8f6ecaf13c8
- https://www.debian.org/security/2023/dsa-5492
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html