CVE-2026-74581: net: ipv6: clear suppressed fib6 rule result
CSIRTS triage
- What
- The IPv6 FIB rule suppression mechanism fails to properly clear results, potentially causing denial of service through improper routing decisions.
- Who is affected
- Systems running vulnerable Linux kernel versions with IPv6 enabled.
- Urgency
- Medium priority; not currently exploited but affects routing stability.
- Action
- Apply kernel security update addressing CVE-2026-74581 when available.
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-2026-74581
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-2026-745810.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-74581 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.