CVE-2026-53132 vsock/virtio: fix potential unbounded skb queue
An attacker can cause a denial of service in the Linux kernel by sending crafted vsock packets that bypass buffer limits, leading to unbounded memory consumption.
- 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-2026-53132?
CVE-2026-53132 is a high-severity denial of service vulnerability in Linux kernel, published on 25 Jun 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:
vsock/virtio: fix potential unbounded skb queue
virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc.
virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM.
If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0.
Fix this by estimating the skb metadata size:
(Number of skbs in the queue) * SKB_TRUESIZE(0)
Which versions are affected by CVE-2026-53132?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53132?
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-2026-53132 being exploited?
There is no known exploitation of CVE-2026-53132 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90384, BELL-CVE-2026-53132, DEBIAN-CVE-2026-53132, GHSA-g7xf-gg8w-vw6h, ROOT-OS-DEBIAN-12-CVE-2026-53132, ROOT-OS-UBUNTU-2404-CVE-2026-53132 and 1 more.