Vulnerability CVE-2024-35982
Published: 2024-05-20

Description:
In the Linux kernel, the following vulnerability has been resolved:

batman-adv: Avoid infinite loop trying to resize local TT

If the MTU of one of an attached interface becomes too small to transmit
the local translation table then it must be resized to fit inside all
fragments (when enabled) or a single packet.

But if the MTU becomes too low to transmit even the header + the VLAN
specific part then the resizing of the local TT will never succeed. This
can for example happen when the usable space is 110 bytes and 11 VLANs are
on top of batman-adv. In this case, at least 116 byte would be needed.
There will just be an endless spam of

batman_adv: batadv0: Forced to purge local tt entries to fit new maximum fragment MTU (110)

in the log but the function will never finish. Problem here is that the
timeout will be halved all the time and will then stagnate at 0 and
therefore never be able to reduce the table even more.

There are other scenarios possible with a similar result. The number of
BATADV_TT_CLIENT_NOPURGE entries in the local TT can for example be too
high to fit inside a packet. Such a scenario can therefore happen also with
only a single VLAN + 7 non-purgable addresses - requiring at least 120
bytes.

While this should be handled proactively when:

* interface with too low MTU is added
* VLAN is added
* non-purgeable local mac is added
* MTU of an attached interface is reduced
* fragmentation setting gets disabled (which most likely requires dropping
attached interfaces)

not all of these scenarios can be prevented because batman-adv is only
consuming events without the the possibility to prevent these actions
(non-purgable MAC address added, MTU of an attached interface is reduced).
It is therefore necessary to also make sure that the code is able to handle
also the situations when there were already incompatible system
configuration are present.

 References:
https://git.kernel.org/stable/c/04720ea2e6c64459a90ca28570ea78335eccd924
https://git.kernel.org/stable/c/b3ddf6904073990492454b1dd1c10a24be8c74c6
https://git.kernel.org/stable/c/70a8be9dc2fb65d67f8c1e0c88c587e08e2e575d
https://git.kernel.org/stable/c/87b6af1a7683e021710c08fc0551fc078346032f
https://git.kernel.org/stable/c/3fe79b2c83461edbbf86ed8a6f3924820ff89259
https://git.kernel.org/stable/c/4ca2a5fb54ea2cc43edea614207fcede562d91c2
https://git.kernel.org/stable/c/ca54e2671548616ad34885f90d4f26f7adb088f0
https://git.kernel.org/stable/c/b1f532a3b1e6d2e5559c7ace49322922637a28aa
Copyright 2026, cxsecurity.com

 

Back to Top