Bugzilla – Bug 1215113
VUL-0: CVE-2023-4207: kernel-source-azure,kernel-source-rt,kernel-source: net/sched UAF
Last modified: 2024-02-28 12:35:05 UTC
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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-4207 https://bugzilla.redhat.com/show_bug.cgi?id=2237757 https://www.cve.org/CVERecord?id=CVE-2023-4207 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=76e42ae831991c828cffa8c37736ebfb831ad5ec https://kernel.dance/76e42ae831991c828cffa8c37736ebfb831ad5ec
I think CVE-2023-4207 is a duplicate to the fixing commit 76e42ae831991c828cffa8c37736ebfb831ad5ec "net/sched: cls_fw: No longer copy tcf_result on update to avoid use-after-fr ee" described in CVE-2023-4128 I will talk to mitre
Alphabet CNA has confirmed this to be a duplicate to bnc#1214149, closing as duplicate *** This bug has been marked as a duplicate of bug 1214149 ***