What’s Vulnerable › Vulnerabilities

CVE-2026-89992: cpuidle: dt_idle_genpd: kfree() the original name allocation

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

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.

Affected products

• Linux kernel: 5.18 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

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

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