CVE-2026-97613 net: mana: Reserve extra CQ slot for the fence completion CQE
A missing CQ slot reservation in the Linux kernel MANA driver can cause dropped fence completions and system hangs, requiring a kernel patch.
- 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-2026-97613?
CVE-2026-97613 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: mana: Reserve extra CQ slot for the fence completion CQE
The RX completion queue is sized to hold exactly one CQE per posted RX WQE. MANA_FENCE_RQ makes hardware post an additional CQE_RX_OBJECT_FENCE after the packet CQEs. The current sizing reserves no extra slot for it and in rare cases, CQ has no guaranteed slot for the fence CQE when it is full of packet CQEs. This can lead to dropping the fence completion while the driver waits holding RTNL lock throughout the timeout duration. Reserve one extra CQE slot for CQE_RX_OBJECT_FENCE. mana_gd_alloc_memory() requires queue_size to be a power-of-two and at least MANA_PAGE_SIZE; the reservation pushes cq_size past a power-of-two, so round up the CQ size in mana_create_rxq().
Which versions are affected by CVE-2026-97613?
How do I fix CVE-2026-97613?
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-2026-97613 being exploited?
There is no known exploitation of CVE-2026-97613 in the wild and no public exploit code.
Sources
Also known as AZL-104832, BELL-CVE-2026-97613, DEBIAN-CVE-2026-97613, GHSA-7qp2-8vhf-pgwx, UBUNTU-CVE-2026-97613.