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

CVE-2026-74690 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-74690, released September 4, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-74690
- Priority: High
- CVSS: 8.4 (Moderate)
- EPSS: 0.0014
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74690

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-74690](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74690.md) | Sep 4, 2026 |
| Linux | linux Debian 14 | 7.1.9-1 | [DEBIAN-CVE-2026-74690](https://patchblox.com/security/data/fix/linux/debian-cve-2026-74690.md) | Sep 4, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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