CVE-2026-98105 net: ethernet: oa_tc6: Improve the error recovery
A flaw in the Linux kernel oa_tc6 ethernet driver allows remote attackers to cause a denial of service via buffer overflow errors during traffic oversubscription.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-98105?
CVE-2026-98105 is a denial of service vulnerability in Linux, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: oa_tc6: Improve the error recovery
When oversubscribed traffic causes lot of buffer overflow errors, probably due to loss of data chunks, driver fails to find a data chunk with end_valid bit set, before it runs out of sk buffer space. As a result, assert is seen during skb_put.
Now, check is made if skb buffer has enough tailroom for the incoming data before accepting. If there is no room, current frame is abandoned and it will start looking for a data chunk with start_valid bit, that is a new frame.
SK buffer allocation error is considered as recoverable error.
rx_buf_overflow flag is too specific and no longer the only condition this flag is used for. Therefore it is renamed as wait_until_start_valid. This is more appropriate as this flag is used to look for the next data chunk with SV bit set, after failures like buffer overflow, buffer allocation failure, skb pointer validity besides buffer overflow error.
Not writing to status0 if it reads 0.
Which versions are affected by CVE-2026-98105?
How do I fix CVE-2026-98105?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-98105 being exploited?
There is no known exploitation of CVE-2026-98105 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-98105, DEBIAN-CVE-2026-98105, GHSA-f226-mgwm-5x89, UBUNTU-CVE-2026-98105.