Use After Free Affecting kernel-devel-matched package, versions <0:5.14.0-362.8.1.el9_3
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Test your applications- Snyk ID SNYK-ORACLE9-KERNELDEVELMATCHED-6066714
- published 17 Nov 2023
- disclosed 6 Sep 2023
Introduced: 6 Sep 2023
CVE-2023-4207 Open this link in a new tabHow to fix?
Upgrade Oracle:9
kernel-devel-matched
to version 0:5.14.0-362.8.1.el9_3 or higher.
This issue was patched in ELSA-2023-6583
.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-devel-matched
package and not the kernel-devel-matched
package as distributed by Oracle
.
See How to fix?
for Oracle:9
relevant fixed versions and status.
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.
References
- https://linux.oracle.com/cve/CVE-2023-4207.html
- https://linux.oracle.com/errata/ELSA-2023-6583.html
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76e42ae831991c828cffa8c37736ebfb831ad5ec
- https://kernel.dance/76e42ae831991c828cffa8c37736ebfb831ad5ec
- https://www.debian.org/security/2023/dsa-5492
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html