Answer in brief
CVE-2026-90074 records a Unknown severity vulnerability in net/sched: fq_pie: clamp default quantum to avoid signed overflow. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <1f43e4dbc93b7d02761a024d5f895df823c07b72 || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <f7942b2693bc24c7d609a03d06f97bee3b0bd96a || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <6f1be05faecef4c0f9a008200209f66ef2e133f7 || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <435da3734a8e63d3067016accc977ed1d10aaaa0 || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <bf97fd2163ad1191ef8daa3d4df8372aee19e396 || >=ec97ecf1ebe485a17cd8395a5f35e6b80b57665a <c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 | 1f43e4dbc93b7d02761a024d5f895df823c07b72, f7942b2693bc24c7d609a03d06f97bee3b0bd96a, 6f1be05faecef4c0f9a008200209f66ef2e133f7, 435da3734a8e63d3067016accc977ed1d10aaaa0, 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f, 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795, bf97fd2163ad1191ef8daa3d4df8372aee19e396, c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 |
| Linux/Linuxgeneric | 5.6 | Not reported |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
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.
Quoted source text, attributed separately from HOL analysis.