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CVE-2026-23105— net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag

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 kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于qfq调度器依赖子队列长度判断激活状态，可能导致类激活状态判断错误。

CVSS 7.8 · High EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 462dbc9101acd38e92eda93c0726857517a24bbd< fac2c67bb2bb732eae4283e45fc338af7e08c254 affected
462dbc9101acd38e92eda93c0726857517a24bbd< b8c24cf5268fb3bfb8d16324c3dbb985f698c835 affected
462dbc9101acd38e92eda93c0726857517a24bbd< f27047abf7cac1b6f90c3ad60de21ef9f717c26d affected
462dbc9101acd38e92eda93c0726857517a24bbd< 93b8635974fb050c43d07e35e5edfe6e685ca28a affected
462dbc9101acd38e92eda93c0726857517a24bbd< abd9fc26ea577561a5ef6241a1b058755ffdad0c affected
462dbc9101acd38e92eda93c0726857517a24bbd< 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6 affected
462dbc9101acd38e92eda93c0726857517a24bbd< d837fbee92453fbb829f950c8e7cf76207d73f33 affected
3.8 affected
… +8 more rows
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I. Basic Information for CVE-2026-23105

Vulnerability Information
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Vulnerability Title
net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag This is more of a preventive patch to make the code more consistent and to prevent possible exploits that employ child qlen manipulations on qfq. use cl_is_active instead of relying on the child qdisc's qlen to determine class activation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于qfq调度器依赖子队列长度判断激活状态，可能导致类激活状态判断错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 462dbc9101acd38e92eda93c0726857517a24bbd ~ fac2c67bb2bb732eae4283e45fc338af7e08c254 -
Linux Linux 3.8 -

II. Public POCs for CVE-2026-23105

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III. Intelligence Information for CVE-2026-23105

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Same Patch Batch · Linux · 2026-02-04 · 79 CVEs total

CVE-2026-23098 8.8 HIGH netrom: fix double-free in nr_route_frame()
CVE-2026-23066 7.8 HIGH rxrpc: Fix recvmsg() unconditional requeue
CVE-2026-23074 7.8 HIGH net/sched: Enforce that teql can only be used as root qdisc
CVE-2026-23077 7.8 HIGH mm/vma: fix anon_vma UAF on mremap() faulted, unfaulted merge
CVE-2026-23103 7.8 HIGH ipvlan: Make the addrs_lock be per port
CVE-2026-23095 7.5 HIGH gue: Fix skb memleak with inner IP protocol 0.
CVE-2025-71192 7.0 HIGH ALSA: ac97: fix a double free in snd_ac97_controller_register()
CVE-2026-23063 uacce: ensure safe queue release with state management
CVE-2026-23065 platform/x86/amd: Fix memory leak in wbrf_record()
CVE-2026-23064 net/sched: act_ife: avoid possible NULL deref
CVE-2026-23067 iommu/io-pgtable-arm: fix size_t signedness bug in unmap path
CVE-2026-23042 idpf: fix aux device unplugging when rdma is not supported by vport
CVE-2026-23059 scsi: qla2xxx: Sanitize payload size to prevent member overflow
CVE-2026-23058 can: ems_usb: ems_usb_read_bulk_callback(): fix URB memory leak
CVE-2026-23057 vsock/virtio: Coalesce only linear skb
CVE-2026-23056 uacce: implement mremap in uacce_vm_ops to return -EPERM
CVE-2025-71199 iio: adc: at91-sama5d2_adc: Fix potential use-after-free in sama5d2_adc driver
CVE-2025-71198 iio: imu: st_lsm6dsx: fix iio_chan_spec for sensors without event detection
CVE-2025-71197 w1: therm: Fix off-by-one buffer overflow in alarms_store
CVE-2026-23060 crypto: authencesn - reject too-short AAD (assoclen<8) to match ESP/ESN spec

Showing top 20 of 79 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-23105

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