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CVE-2026-90074

Unknown

Last modified

CVE-2026-90074 is a vulnerability of currently unknown severity. 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.

Description

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < 1f43e4dbc93b7d02761a024d5f895df823c07b72; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < f7942b2693bc24c7d609a03d06f97bee3b0bd96a; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < 6f1be05faecef4c0f9a008200209f66ef2e133f7; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < 435da3734a8e63d3067016accc977ed1d10aaaa0; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < bf97fd2163ad1191ef8daa3d4df8372aee19e396; >= ec97ecf1ebe485a17cd8395a5f35e6b80b57665a, < c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9
LinuxLinux5.6

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90074?
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.
How severe is CVE-2026-90074?
Severity scoring for CVE-2026-90074 is pending analysis.
How do I fix CVE-2026-90074?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST