CVE-2026-90074net/sched: fq_pie: clamp default quantum to avoid signed overflow
- —Not scoredno CVSS score yet
- 0.22%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 32 days later
· 32 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.22% · top 88% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 1f43e4dbc93b7d02761a024d5f895df823c07b72
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < f7942b2693bc24c7d609a03d06f97bee3b0bd96a
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 6f1be05faecef4c0f9a008200209f66ef2e133f7
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 435da3734a8e63d3067016accc977ed1d10aaaa0
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < bf97fd2163ad1191ef8daa3d4df8372aee19e396
- affected ec97ecf1ebe485a17cd8395a5f35e6b80b57665a – < c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9
- affected 5.6
- unaffected < 5.6
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/1f43e4dbc93b7d02761a024d5f895df823c07b72 (opens in a new tab)
- https://git.kernel.org/stable/c/f7942b2693bc24c7d609a03d06f97bee3b0bd96a (opens in a new tab)
- https://git.kernel.org/stable/c/6f1be05faecef4c0f9a008200209f66ef2e133f7 (opens in a new tab)
- https://git.kernel.org/stable/c/435da3734a8e63d3067016accc977ed1d10aaaa0 (opens in a new tab)
- https://git.kernel.org/stable/c/44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f (opens in a new tab)
- https://git.kernel.org/stable/c/044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 (opens in a new tab)
- https://git.kernel.org/stable/c/bf97fd2163ad1191ef8daa3d4df8372aee19e396 (opens in a new tab)
- https://git.kernel.org/stable/c/c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-81935 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-90074)Record last updated .