CVE-2026-45917: ipvs: do not keep dest_dst if dev is going down

mediumCVSS 5.5CVE-2026-45917

CSIRTS triage

vendor: Linux product: Linux kernelOther

What: The ipvs module does not properly clean up dest_dst when a device is being brought down, potentially leaving stale references.
Who is affected: Systems running Linux kernel with ipvs (IP Virtual Server) load balancing enabled.
Urgency: Medium priority; not currently exploited but affects availability of load balancing infrastructure.
Action: Apply Linux kernel patch that ensures dest_dst cleanup during device down events, or update to a patched kernel version.

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: medium — CVSS 5.5
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45917

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-2026-459170.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45917	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Linux Kernel: Multiple Vulnerabilitiescert-bund
unknownexploitedMultiple vulnerabilities in SUSE Linux kernel (August 14, 2026)cert-fr-avis
highUSN-8619-1: Linux kernel (HWE) vulnerabilitiesubuntu
highUSN-8609-1: Linux kernel (Azure CVM) vulnerabilitiesubuntu
highUSN-8607-1: Linux kernel (Azure CVM) vulnerabilitiesubuntu
highUSN-8606-1: Linux kernel (Azure) vulnerabilitiesubuntu
unknownUSN-8492-5: Linux kernel (FIPS) vulnerabilitiesubuntu
unknownUSN-8492-4: Linux kernel (Raspberry Pi) vulnerabilitiesubuntu

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