CVE-2026-74550: net: do not send ICMP/NDISC Redirects when peer allocation fails

mediumCVSS 5.9CVE-2026-74550

CSIRTS triage

vendor: Linux product: Linux Kernel Denial of service

What: The kernel sends ICMP or NDISC redirect messages even when peer allocation fails, potentially enabling denial-of-service conditions.
Who is affected: Systems running affected Linux kernel versions where network redirects are processed.
Urgency: Medium priority; not currently exploited but affects network stack stability.
Action: Apply kernel patch to prevent redirect transmission on allocation failure 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 5.9
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74550

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-2026-745500.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-74550	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-74550: In the Linux kernel, the following vulnerability has been resolved: net: do not send ICMP/NDIS…nvd

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