CVE-2026-68338: net/packet: avoid fanout hook re-registration after unregister
CSIRTS triage
- What
- The packet socket fanout hook can be re-registered after unregister, causing unexpected packet processing behavior.
- Who is affected
- Systems running Linux kernel with packet socket fanout features in use.
- Urgency
- Medium severity (CVSS 5.5) and not yet exploited; address to prevent denial of service conditions.
- Action
- Apply the latest Linux kernel patch that prevents fanout hook re-registration after unregister.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68338
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-683380.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-68338 | coverage & exploitation status | NVD · CVE.org |
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