Date: Tue, 7 Sep 2021 14:09:52 +0530 From: Rohit Keshri <rkeshri@...hat.com> To: oss-security@...ts.openwall.com Subject: CVE-2021-3715 Linux kernel: use-after-free in route4_change() in net/sched/cls_route.c Hello Team, A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is confidentiality, integrity, as well as system availability. This issue was fixed in the upstream Kernel 5.10 onward with ef299cc3fa1a9 ~~~ https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359 ~~~ This problem is considered a security threat because unprivileged user/network namespaces can escalate privileges on the system. 'CVE-2021-3715' was assigned by Red Hat. * acks (Zhenpeng Lin) * Description from the reporter: "Originally the bug was found by Syzkaller in https://syzkaller.appspot.com/bug?id=6a039858238a38cbc7f372607fc5d49f4469cf2c . It shows a warning bug effect that is not exploitable, seemingly. However, the bug can be turned into a use-after-free bug and eventually results in a working exploit, with all the mitigation in centos being bypassed." from zhenpeng Updated packages for Red Hat are currently in QE and will be released when available. Regards, .. Rohit Keshri / Red Hat Product Security Team PGP: OX01BC 858A 07B7 15C8 EF33 BFE2 2EEB 0CBC 84A4 4C2D secalert@...hat.com for urgent response
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