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CVE-2026-98011— net/sched: hhf: clamp quantum in change and init paths

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: hhf: 在修改和初始化路径中限制量子（quantum）值 函数接受来自用户空间的任意量子值，包括 1。通过构造特定的 size table， 可达约 2 GiB，导致当 quantum=1 时，在 qdisc 锁保护下的 deficit-refill（赤字回填）循环将执行约 2^31 次，从而引发软锁死（soft lockup），造成拒绝服务（DoS）漏洞。 修复措施如下： 在 中引入 ，使其与 的行为保持一致。 将 中的量子值限制在 [256,

AI Predicted 7.8 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 10239edf86f137ce4c39b62ea9575e8053c549a0< a328698d046098e6f55b3b1460cac6bab577be58 affected
10239edf86f137ce4c39b62ea9575e8053c549a0< c364ad3ab3c8a6bce469a5cbf02881ab1324c5da affected
10239edf86f137ce4c39b62ea9575e8053c549a0< 2c6dd9fc86d446a03728c43f3b96d9ae29aa058f affected
10239edf86f137ce4c39b62ea9575e8053c549a0< 6570f326a6a96bedf3d1d1dab6acc9f8c29104ec affected
10239edf86f137ce4c39b62ea9575e8053c549a0< 1113b674307ffddd402524bd1fd9d7d5629b705b affected
10239edf86f137ce4c39b62ea9575e8053c549a0< 2e77947bbf6c166e76c038663832d0914418f761 affected
10239edf86f137ce4c39b62ea9575e8053c549a0< 0898c6f9fa9ce2632ae88bd0f34a878ccc6335af affected
10239edf86f137ce4c39b62ea9575e8053c549a0< eb56a495f59baf6cad5ed80e3ffb9078098b1346 affected
… +10 more rows
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I. Basic Information for CVE-2026-98011

Vulnerability Information
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Vulnerability Title
net/sched: hhf: clamp quantum in change and init paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: hhf: clamp quantum in change and init paths hhf_change() accepts any quantum from userspace, including 1. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so quantum=1 makes the deficit-refill loop spin ~2^31 times under the qdisc lock (a soft lockup / denial of service). Add max(256U, ...) in hhf_change() matching fq_codel_change(). Clamp hhf_init() to [256, 1<<20] matching the siblings, and remove the old fallback that only set quantum=256 on overflow. Conditions to recreate the bug: CONFIG_NET_SCH_HHF=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root hhf tc qdisc change dev dummy0 root hhf quantum 1 stab data 32768 size_log 15 cell_log 0
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 10239edf86f137ce4c39b62ea9575e8053c549a0 ~ a328698d046098e6f55b3b1460cac6bab577be58 -
Linux Linux 3.14 -

II. Public POCs for CVE-2026-98011

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III. Intelligence Information for CVE-2026-98011

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Patches & Fixes for CVE-2026-98011 (8)

Same Patch Batch · Linux · 2026-09-25 · 372 CVEs total

CVE-2026-100075 9.8 CRITICAL RDMA/srpt: Fix srpt_alloc_rw_ctxs() unwind counters
CVE-2026-97555 8.8 HIGH smb: client: fix heap overflow in DACL owner/group rewrite
CVE-2026-97957 8.8 HIGH net: hinic: fix mailbox segment buffer overflow
CVE-2026-97527 8.8 HIGH scsi: qla2xxx: Serialize NVMe unsol ctx list with a per-fcport lock
CVE-2026-97528 8.8 HIGH scsi: qla2xxx: Unlink NVMe unsol ctx before freeing on LS reject error
CVE-2026-98115 8.8 HIGH ksmbd: safely drain sessions during logoff
CVE-2026-97525 8.2 HIGH x86/mm/pat: Allocate split page tables as kernel page tables
CVE-2026-98069 8.1 HIGH net/rds: acquire the fastpath locks in rds_conn_shutdown()
CVE-2026-97573 8.1 HIGH bnxt_en: Handle buffer allocation failure in bnxt_rx_ring_reset()
CVE-2026-97570 8.1 HIGH bnxt_en: Bound SW TPA IDs to prevent crashes
CVE-2026-98130 8.1 HIGH sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
CVE-2026-98070 8.1 HIGH net/rds: acquire RDS_IN_XMIT in rds_tcp_reset_callbacks()
CVE-2026-98002 7.8 HIGH iommu/amd: Fix ineffective error check in nested domain allocation
CVE-2026-97575 7.8 HIGH media: v4l2-ctrls: validate AV1 tile counts
CVE-2026-97576 7.8 HIGH media: v4l2-ctrls: validate HEVC tile counts
CVE-2026-97941 7.8 HIGH mm/slab: take n->list_lock in __slab_try_return_freelist() to avoid race
CVE-2026-98112 7.8 HIGH ksmbd: fix listener task lifetime on netdev events
CVE-2026-97937 7.8 HIGH ftrace: fork: Initialize function graph state before copy_exec_state()
CVE-2026-97580 7.8 HIGH media: rkvdec: bound HEVC tile loops and PPS id to the array capacity
CVE-2026-97940 7.8 HIGH ipv6: fix fib6 walker UAF on seq stop

Showing top 20 of 372 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-98011

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