Date: Wed, 8 Sep 2021 13:15:34 +0530 From: Rohit Keshri <rkeshri@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: CVE-2021-3715 Linux kernel: use-after-free in route4_change() in net/sched/cls_route.c Thank you Greg, Correction please, This issue was fixed in the upstream Kernel 5.6 onward with ef299cc3fa1a9 .. Rohit Keshri / Red Hat Product Security Team PGP: OX01BC 858A 07B7 15C8 EF33 BFE2 2EEB 0CBC 84A4 4C2D secalert@...hat.com for urgent response On Tue, Sep 7, 2021 at 3:47 PM Greg KH <greg@...ah.com> wrote: > On Tue, Sep 07, 2021 at 02:09:52PM +0530, Rohit Keshri wrote: > > 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 > > Note, commit ef299cc3fa1a ("net_sched: cls_route: remove the right > filter from hashtable") came out in the 5.6 kernel release, in March of > 2020, and was also backported to all relevant stable kernel releases at > the beginning of April, 2020: > 4.4.218 4.9.218 4.14.175 4.19.114 5.4.29 5.5.14 > > How did 5.10 get messed up in this, it was not released until December > 2020? > > thanks, > > greg k-h > >
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