CVE-2026-74669: ipvs: clear IPv4 options after rebasing tunnel ICMP errors

highCVSS 7.4CVE-2026-74669

CSIRTS triage

vendor: Linux product: Linux kernel Information disclosure

What: A vulnerability in IPVS (IP Virtual Server) where IPv4 options are not cleared after rebasing tunnel ICMP errors, leaking information.
Who is affected: Systems running affected Linux kernel versions with IPVS load balancing and tunnel encapsulation enabled.
Urgency: High priority; CVSS 7.4 and can leak sensitive IPv4 option data through ICMP error messages in tunneled traffic.
Action: Apply Linux kernel patch clearing IPv4 options after rebasing tunnel ICMP errors in IPVS.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.4
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74669

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-2026-746690.51% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74669	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalCVE-2026-74669: In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options a…nvd

Recent advisories for ipvs

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-74724: In the Linux kernel, the following vulnerability has been resolved: ipvs: avoid out-of-bounds …nvd · 2026-08-22
highCVE-2026-74670: In the Linux kernel, the following vulnerability has been resolved: ipvs: stop estimator after…nvd · 2026-08-22
criticalCVE-2026-74669: In the Linux kernel, the following vulnerability has been resolved: ipvs: clear IPv4 options a…nvd · 2026-08-22
criticalCVE-2026-72319: In the Linux kernel, the following vulnerability has been resolved: ipvs: ensure inner headers…nvd · 2026-08-15
highCVE-2026-72021: In the Linux kernel, the following vulnerability has been resolved: ipvs: use parsed transport…nvd · 2026-08-15
criticalCVE-2026-72020: In the Linux kernel, the following vulnerability has been resolved: ipvs: reset full ip_vs_seq…nvd · 2026-08-15