Security readout for executives and security teams
Plain-English summary
This Linux kernel issue is a bad frequency value in the mac80211_hwsim Wi-Fi path. The source says it can cause a NULL pointer dereference. Business urgency is unclear because no CVSS score, CWE, or active exploitation evidence is provided.
Executive priority
Handle through normal kernel patch governance unless affected systems use this Wi-Fi component or show related crashes. Escalate if a vendor advisory later confirms exploitable denial of service or broader exposure.
Technical view
The NAN notification used 5475 MHz instead of 5745 MHz, which corresponds to channel 149. The invalid channel value could trigger a NULL pointer dereference in cfg80211_next_nan_dw_notif. The CVE data lists Linux 6.18, 6.18.6, and 6.19 affected, but range semantics are not fully clear.
Likely exposure
Likely limited to Linux systems running affected kernel versions or specific affected commits where mac80211_hwsim and the NAN notification path are present. The source does not identify remote reachability, privilege requirements, or default distro exposure.
Exploitation context
The bundle marks KEV as false and provides no cited evidence of active exploitation, public exploit code, or weaponization. Treat this as a stability and potential denial-of-service concern until vendor advisories clarify impact.
Researcher notes
Evidence is sparse. The public record describes a corrected frequency constant and NULL dereference possibility, but not attack prerequisites, trigger source, privilege level, or real-world impact. Validate against kernel stable commits and downstream distro advisories.
Mitigation direction
- Check vendor kernel advisories for CVE-2026-23040 guidance.
- Update to a kernel build containing the referenced stable fixes.
- Prioritize systems using affected Linux 6.18 to 6.19 kernel builds.
- Avoid enabling mac80211_hwsim where it is not operationally required.
- Track distro backports because version numbers may not show fix status.
Validation and detection
- Inventory Linux kernel versions and package build identifiers.
- Check whether mac80211_hwsim is present or loaded on relevant systems.
- Map installed kernels against vendor advisories and stable commits.
- Review kernel crash logs for related NULL pointer dereference reports.
- Confirm patched builds through distro changelogs or vendor security notices.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2026-23040 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/1251bbdb8f5b2ea86ca9b4268a2e6aa34372ab33CVE reference, Linux
- https://git.kernel.org/stable/c/333418872bfecf4843f1ded7a4151685dfcf07d5CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.