CVE-2026-74620: net/sched: act_gact, act_police: range check the fallback control action

mediumCVSS 4.4CVE-2026-74620

CSIRTS triage

vendor: Linux product: Linux KernelOther

What: The act_gact and act_police traffic control actions lack proper range validation on fallback control action values.
Who is affected: Systems using Linux traffic control with generic action or police action rules.
Urgency: Medium priority; improper validation could lead to out-of-bounds behavior in qdisc operations.
Action: Apply kernel patches addressing CVE-2026-74620 when available through distribution updates.

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 4.4
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74620

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-2026-746200.18% 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-2026-74620	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for net/sched

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-2026-74704: In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_cake: drop …nvd · 2026-08-22
highCVE-2026-74700: In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_api: Always…nvd · 2026-08-22
highCVE-2026-74663: In the Linux kernel, the following vulnerability has been resolved: net/sched: reject overly d…nvd · 2026-08-22
highCVE-2026-74621: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: fix sk_…nvd · 2026-08-22
unknownCVE-2026-74620: In the Linux kernel, the following vulnerability has been resolved: net/sched: act_gact, act_p…nvd · 2026-08-22
highCVE-2026-74583: In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_route: fix …nvd · 2026-08-21