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CVE-2026-90074— net/sched: fq_pie: clamp default quantum to avoid signed overflow

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux 内核中已修复以下漏洞： net/sched: fq_pie：将默认量子值进行限制，以避免有符号整数溢出 在 中，代码将 设置为 ，但未对其取值范围进行限制（clamp）。当某个网络设备具有极大的 MTU（例如，max_mtu 为 0 的 dummy 设备接受 MTU 2147483634）时， 会返回 0x80000000。这个值在 中会使有符号的 溢出为 INT_MIN，从而导致无限循环和软死锁（soft lockup）。 参考 的做法（其取值范围已限定在 [1, 1 << 20]），应将默认量子值限

AI Predicted 4.0 Difficulty: Moderate EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< 1f43e4dbc93b7d02761a024d5f895df823c07b72 affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< f7942b2693bc24c7d609a03d06f97bee3b0bd96a affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< 6f1be05faecef4c0f9a008200209f66ef2e133f7 affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< 435da3734a8e63d3067016accc977ed1d10aaaa0 affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< 44dad8fe99b58a7fe2961e9eec6a5f07ace5b51f affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< 044fa2498bbc2900f0c48a6ef2fdd5b2bdfc3795 affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< bf97fd2163ad1191ef8daa3d4df8372aee19e396 affected
ec97ecf1ebe485a17cd8395a5f35e6b80b57665a< c86cd7ed0b0e44779a3d1683f03e4353baf4bdc9 affected
… +10 more rows
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I. Basic Information for CVE-2026-90074

Vulnerability Information
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Vulnerability Title
net/sched: fq_pie: clamp default quantum to avoid signed overflow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux ec97ecf1ebe485a17cd8395a5f35e6b80b57665a ~ 1f43e4dbc93b7d02761a024d5f895df823c07b72 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-90074

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III. Intelligence Information for CVE-2026-90074

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Patches & Fixes for CVE-2026-90074 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90381 8.8 HIGH wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-90162 8.8 HIGH ksmbd: defer publishing granted locks to prevent UAF/double-free race
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race
CVE-2026-93042 8.8 HIGH dmaengine: dw-edma: Terminate all descriptors without callbacks
CVE-2026-90425 8.8 HIGH iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90074

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