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CVE-2026-98009— net/sched: ets: clamp quantum in parse and fallback 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，已修复以下漏洞： 网络调度器：ets：在解析和回退路径中对 quantum（量子）值进行限制 函数在没有显式指定 quantum 的队列带宽（bands）情况下，会回退使用 。当构造一个特定的大小表时， 可达到约 2 GiB。因此，在缺少头部信息的设备上， 返回零会导致在持有 qdisc 锁的情况下， 循环无限自旋。 现将下限检查（floor）移至 中，使得不仅回退路径，而且显式配置的 quantum 值也被限制在 [256, 1<<20] 范围内。 重现该漏洞的条件： 需要启用配置项 。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 440b66cc7b56ea38e9b878ae88da91992efaa4c4 affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 4ef8664eafafc8db68a1d52601f17dc008a223b7 affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 8b8d782c3b96376217087767dcf662cd3d25f226 affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 226d2702e74a570f5bfae6115b4706da4b94e5cf affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 99ae477b892e203a37985ebc56f0063e072f7f4b affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 8f80b113dea0bed3c1a31a4224b72775cd9ec52d affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< de22c30ec5598aca8797f02082d2ee1358dfa3ff affected
dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33< 1c38487f46b243bfeefec0c0c86023a3904f2214 affected
… +10 more rows
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I. Basic Information for CVE-2026-98009

Vulnerability Information
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Vulnerability Title
net/sched: ets: clamp quantum in parse and fallback paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: ets: clamp quantum in parse and fallback paths ets_qdisc_change() falls back to psched_mtu() with no floor for bands without an explicit quantum. With a crafted size table qdisc_pkt_len reaches ~2 GiB, so a zero psched_mtu on a headerless device makes the deficit-refill loop spin under the qdisc lock. Move the floor into ets_quantum_parse() so explicitly configured quanta are also clamped to [256, 1<<20], not just the fallback path. Conditions to recreate the bug: CONFIG_NET_SCH_ETS=y. Requires CAP_NET_ADMIN (namespace-local via unshare -Urn suffices). tc qdisc add dev dummy0 root ets bands 3 strict 2 quanta 1 1
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 dcc68b4d8084e1ac9af0d4022d6b1aff6a139a33 ~ 440b66cc7b56ea38e9b878ae88da91992efaa4c4 -
Linux Linux 5.6 -

II. Public POCs for CVE-2026-98009

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III. Intelligence Information for CVE-2026-98009

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Patches & Fixes for CVE-2026-98009 (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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