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Re: CVE-2026-72389 (Bridge STP UAF) OpenVZ 7 kernel update planned? [message #53906 is a reply to message #53905] Fri, 11 September 2026 12:53 Go to previous messageGo to previous message
wiredincode is currently offline  wiredincode
Messages: 1
Registered: September 2026
Junior Member
It appears that OpenVZ would be vulnerable to this. I didn't even know about the "Factory" repo, so glad you mentioned this as I made my own patch for Ghostlock.

Note current factory repo version is 3.10.0-1160.129.1.vz7.226.3, not .224.4.



From my initial investigation, it appears you can mitigate this by disabling the Bridge feature on your containers:

[root@chivz23-new ~]# vzctl exec 7570 'ip link add testbr type bridge && echo "EXPOSED" || echo "blocked"'
EXPOSED

[root@chivz23-new ~]# vzctl exec 7570 ip link del testbr

[root@chivz23-new ~]# vzctl set  7570  --features bridge:off --save  --setmode restart
Unable to set features for the running Container
Restart the Container
Stopping the Container ...
[ ... ]
Container start in progress...
Saved parameters for Container 7570

[root@chivz23-new ~]# vzctl exec 7570 'ip link add testbr type bridge && echo "EXPOSED" || echo "blocked"'
RTNETLINK answers: Permission denied
blocked

I can't make any guarantees but there is some logic to the fact that if you can't open a bridge, you can't mess with the timers, so I am applying this mitigation to my containers while I test my kernel patch.

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