CVE-2026-90074
CVE CVE-2026-90074EUVD EUVD-2026-81935Published 2026-09-17T16:05:54.000Z
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: net/sched: fq_pie: clamp default quantum to avoid signed overflow fq_pie_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) without clamping. A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, which overflows the signed flow->deficit to INT_MIN in fq_pie_qdisc_dequeue(), causing an infinite loop and soft lockup. Emulate fq_pie_policy which is already bounded to [1, 1 << 20]; clamp the default to [256, 1 << 20]. 256 matches fq_codel's floor and is a sane minimum for a DRR quantum. Conditions to recreate the bug: a device whose MTU (plus hard_header_len) wraps psched_mtu() into the sign bit (e.g. a dummy device with max_mtu == 0 accepting MTU 2147483634). Requires CAP_NET_ADMIN in a user namespace.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9; patch: 6.12.110; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <435da3734a8e63d3067016accc977ed1d10aaaa0; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <f7942b2693bc24c7d609a03d06f97bee3b0bd96a; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795; 5.6; patch: 5.10.270; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <1f43e4dbc93b7d02761a024d5f895df823c07b72; patch: 5.15.221; patch: 0; patch: 6.6.157; patch: 6.1.188; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <6f1be05faecef4c0f9a008200209f66ef2e133f7; patch: 7.3-rc1; patch: 6.18.52; patch: 7.2.6; ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <bf97fd2163ad1191ef8daa3d4df8372aee19e396
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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