CVE-2026-80779 net/ionic: avoid OOB TX partner lookup for hwstamp RXQ
An out-of-bounds memory access in the Linux kernel's ionic network driver allows attackers to potentially execute code or cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-80779?
CVE-2026-80779 is a memory corruption vulnerability in Linux, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
net/ionic: avoid OOB TX partner lookup for hwstamp RXQ
The dedicated hardware timestamp RX queue is allocated with q->index equal to lif->ionic->nrxqs_per_lif. The normal txqcqs array only contains the regular queue pairs, so using that index to set rxq->partner can read one entry past txqcqs[] and then write through the derived pointer. Only link RX/TX partners for normal queue-pair indexes. Leave the hwstamp RX queue unpaired, and make the XDP_TX path abort cleanly if an RX queue has no TX partner.
Which versions are affected by CVE-2026-80779?
How do I fix CVE-2026-80779?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80779 being exploited?
There is no known exploitation of CVE-2026-80779 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-80779, DEBIAN-CVE-2026-80779, GHSA-5565-rhhw-mpqw, UBUNTU-CVE-2026-80779.