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CVE-2026-90072— net/sched: sfq: clamp quantum to avoid signed overflow soft lockup

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.

在 Linux 内核中，以下漏洞已得到修复： net/sched: sfq：通过限制（clamp）quantum（量子）大小来避免有符号整数溢出导致的软死锁（soft lockup） 问题描述： 在 函数中，执行了 （ 为无符号类型）。如果某网卡的 MTU 极大（例如，一个 的 dummy 设备接受 MTU 2147483634），会导致 返回 。这使得 ，随后 会在 和 之间无限交替，导致 在持有队列调度器（qdisc）锁的情况下陷入死循环（自旋）。 修复方法： 将 限制在 范围内，以确保补充（refill）循环

AI Predicted 7.5 Difficulty: Moderate EPSS 0.22% · P11

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 86799499585af06a9431c9e7782658667bd62650 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2017c355a5a1af77736cd1739fe922f69b5652dc affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6581a82bf08ba5d4e2a6d4e3080df43315b296c4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9d782c662879c3adaaca30e05c36910ad11b9e54 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d72dbdfaeb5b9b8d884e0e036c3442754379ef74 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< aeb8196ecb95146e3410f635628e6cd47352b3e5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< da16c31517cd2c06bb2c78c73e91ae192c01c426 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 816e90057ab1879562a5b7cc688e35bb9027ae97 affected
… +10 more rows
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I. Basic Information for CVE-2026-90072

Vulnerability Information
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Vulnerability Title
net/sched: sfq: clamp quantum to avoid signed overflow soft lockup
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sfq: clamp quantum to avoid signed overflow soft lockup sfq_init() sets q->quantum = psched_mtu(qdisc_dev(sch)) (unsigned). A device with a huge MTU (e.g. dummy with max_mtu == 0 accepting MTU 2147483634) makes psched_mtu() return 0x80000000, so slot->allot = INT_MIN and INT_MIN + INT_MIN toggles between INT_MIN and 0 forever, spinning sfq_dequeue() under the qdisc lock. Clamp the quantum to [256, 1 << 20] so the refill loop terminates. The lower bound also covers q->quantum == 0 (psched_mtu() returning 0), which spins sfq_dequeue() identically. sfq_change() already rejects a negative quantum, so only the init path was exposed. 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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 86799499585af06a9431c9e7782658667bd62650 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-90072

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III. Intelligence Information for CVE-2026-90072

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Patches & Fixes for CVE-2026-90072 (7)

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

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IV. Related Vulnerabilities

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Same vendor: Linux

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