# CVE-2026-98476: s390/cio: Fix NULL pointer dereference in ccw_device_get_util_str()

CVE-2026-98476 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-98476, released October 19, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-98476
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 18, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98476

## Description

In the Linux kernel, the following vulnerability has been resolved:  s390/cio: Fix NULL pointer dereference in ccw_device_get_util_str()  The channel path registry entry associated with a CHPID may be removed while the subchannel's PMCW still references that CHPID. In this case, chpid_to_chp() can return NULL, leading to a NULL pointer dereference.  Add the missing NULL check before dereferencing the returned pointer.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.190-1 | [DEBIAN-CVE-2026-98476](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98476.md) | Oct 19, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.113-1 | [DEBIAN-CVE-2026-98476](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98476.md) | Oct 19, 2026 |
| Linux | linux Debian 14 | 7.2.9-1 | [DEBIAN-CVE-2026-98476](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98476.md) | Oct 19, 2026 |
| Linux | linux-6.12 Debian 12.15 (bookworm) | 6.12.113-1~deb12u1 | [DEBIAN-CVE-2026-98476](https://patchblox.com/security/data/fix/linux/debian-cve-2026-98476.md) | Oct 19, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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