[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <CAPmip_wN+Ch2nJc_1ncVNo19CMpgn4tasu=1-5nCDhza6rRzFg@mail.gmail.com>
Date: Fri, 1 May 2026 13:31:10 -0400
From: cyber security <cs7778503@...il.com>
To: oss-security@...ts.openwall.com
Subject: Re: Re: CVE-2026-31431: CopyFail: linux local
privilege scalation
mostly every distro + it can lead to container + snap + flatpak
container escapes
On Fri, May 1, 2026 at 1:16 PM Justin Swartz
<justin.swartz@...ingedge.co.za> wrote:
>
> On Fri, 2026-05-01 at 11:08 -0400, Reid Sutherland wrote:
> > Does anything load the vulnerable module by default or not? If not,
> > this should be low-rated IMO.
>
> An unprivileged user requesting an AF_ALG socket will trigger the kernel
> module autoloader:
>
> $ su -l
> Password:
>
> # cat > /root/modprobe << "EOF"
> #!/bin/sh
> echo "$(date -u) modprobe $@" >> /tmp/modprobe.log
> exec /sbin/modprobe "$@"
> EOF
>
> # chmod 700 /root/modprobe
>
> # cat /proc/sys/kernel/modprobe
> /sbin/modprobe
>
> # echo "/root/modprobe" > /proc/sys/kernel/modprobe
> # cat /proc/sys/kernel/modprobe
> /root/modprobe
>
> # exit
>
> $ lsmod | grep aead | wc -l
> 0
>
> $ date -u && ./copy_fail_exp.py
> Fri 01 May 2026 16:08:24 UTC
>
> # cat /tmp/modprobe.log
> Fri May 1 16:08:24 UTC 2026 modprobe -q -- net-pf-38
> Fri May 1 16:08:24 UTC 2026 modprobe -q -- algif-aead
>
> # lsmod | grep aead
> algif_aead 16384 0
> af_alg 36864 1 algif_aead
>
> # echo "/sbin/modprobe" > /proc/sys/kernel/modprobe
> # cat /proc/sys/kernel/modprobe
> /sbin/modprobe
>
> # exit
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
