Use After Free Affecting kernel-debug-modules package, versions <0:4.18.0-305.el8
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGMODULES-5842359
- published 5 Jun 2023
- disclosed 22 May 2023
Introduced: 22 May 2023
CVE-2020-36694 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug-modules to version 0:4.18.0-305.el8 or higher.
This issue was patched in RHSA-2021:1578.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-modules package and not the kernel-debug-modules package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
An issue was discovered in netfilter in the Linux kernel before 5.10. There can be a use-after-free in the packet processing context, because the per-CPU sequence count is mishandled during concurrent iptables rules replacement. This could be exploited with the CAP_NET_ADMIN capability in an unprivileged namespace. NOTE: cc00bca was reverted in 5.12.
References
- https://access.redhat.com/security/cve/CVE-2020-36694
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cc00bcaa589914096edef7fb87ca5cee4a166b5c
- https://security.netapp.com/advisory/ntap-20230622-0005/
- https://syzkaller.appspot.com/bug?id=0c4fd9c6aa04ec116d01e915d3b186f71a212cb2