VulnerabilityPublished 30 Oct 2025

CVE-2025-40089: Linux kernel · cxl/features: Add check for no entries in cxl_feature_info

Source GCVE Database

Compare

Not known to be exploited.

Data as of 29 Oct 2026, 23:09 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Exploitation evidence

Disclosed: evidence found.
CVE published 30 Oct 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

ghsa-c72w-7535-v29m

What to do

AI-suggested

A fix has been implemented in the Linux kernel to add a check for null cxl_feature_info entries and return an error if no hardware support exists. Users should apply the updated kernel version containing this fix once available.

Description

A vulnerability in the Linux kernel's cxl/features component was fixed by adding a check for null entries in cxl_feature_info. Without this check, the kernel could dereference a null pointer if the hardware does not support features, leading to a kernel oops and potential system crash.

Impact

This vulnerability can cause a kernel NULL pointer dereference resulting in a kernel oops, which may lead to system instability or crash. There is no indication of privilege escalation or data corruption from the provided information.

Summary

The Linux kernel's cxl EDAC subsystem calls cxl_feature_info() to retrieve feature information. If the hardware lacks feature support, cxl_feature_info() may return NULL (cxlfs). Previously, the kernel did not check for this NULL pointer before dereferencing it, causing a kernel NULL pointer dereference and a kernel oops. The fix adds a check for cxlfs before dereferencing and returns -EOPNOTSUPP if no cxlfs is created due to lack of hardware support.

References

Community reviews

Loading reviews…