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CVE-2026-98012— net/sched: sfq: clamp quantum in change path

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，已修复以下漏洞： net/sched: sfq: 在修改路径中对 quantum 值进行限制 sfq_change() 函数接受任何非负的 quantum 值（仅拒绝 (int)ctl->quantum < 0 的情况）。当构造一个大小表，使得 qdisc_pkt_len 达到约 2 GiB 时，若 quantum=1，则在持有 qdisc 锁的情况下，deficit-refill 循环将旋转约 2^31 次，导致软锁死（soft lockup）/ 拒绝服务（Denial of Servic

AI Predicted 6.5 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 25

VendorProduct Version RangeStatus
Linux Linux 4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa< 4117c528b2de5fdc3e4a7e3626815b616a635cdc affected
548cf048b426729a7a1fa6acd1271c010c9a7380< f82fa6f10d4a69322cad0f7a4aa523ce6292a5a0 affected
c49ac48fac51a6a54efd5963954d02bacf075085< 0692ce5a528df450d64e9f819054177e9d91076f affected
58ae7465f0e7113d45aa88a66bf2d203c71c195e< e4192bcf83aaab02129644ddf4656fd86e93751f affected
82bd38bd5467ece1ee274b493f51326cf5220a5a< f3820dce042a673fcb28cc31c87ee14257e21a17 affected
e4650d7ae4252f67e997a632adfae0dd74d3a99a< 534cd7ecbbc6e8a974f4003a5c1557439c6e0a72 affected
e4650d7ae4252f67e997a632adfae0dd74d3a99a< e6c1cb728e389354203a72bc77464c222a247aeb affected
e4650d7ae4252f67e997a632adfae0dd74d3a99a< fb9f88a33c516ea5c0bcd9a22ca288b246b34567 affected
… +17 more rows
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I. Basic Information for CVE-2026-98012

Vulnerability Information
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Vulnerability Title
net/sched: sfq: clamp quantum in change path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: sfq: clamp quantum in change path sfq_change() accepts any non-negative quantum (only rejects (int)ctl->quantum < 0). 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, ...) matching fq_codel_change(). Reject quantum > 1<<20 with -EINVAL, matching fq_codel_change() and the init clamp. Conditions to recreate the bug: CONFIG_NET_SCH_SFQ=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root sfq tc qdisc change dev dummy0 root sfq 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 4919649699c5f4dbae08b8e2ed536fc9d6c3c2aa ~ 4117c528b2de5fdc3e4a7e3626815b616a635cdc -
Linux Linux 6.13 -

II. Public POCs for CVE-2026-98012

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III. Intelligence Information for CVE-2026-98012

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Patches & Fixes for CVE-2026-98012 (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

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