Medium [CVE-2026-74663] reject overly deep qdisc hierarchies
This medium-severity Red Hat Linux advisory covers CVE-2026-74663.
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Summary
A flaw was found in the Linux kernel. An attacker could create overly deep queueing discipline (qdisc) hierarchies, leading to excessive recursion in qdisc tree walkers.
This can exhaust the kernel stack, resulting in a Denial of Service (DoS) due to a system crash. Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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