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CVE-2025-38177— sch_hfsc: make hfsc_qlen_notify() idempotent

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hfsc_qlen_notify非幂等操作，可能导致资源管理问题。

CVSS 7.8 · High EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 959466588aa7f84ccf79ae36a1d89542eaf9aaec< 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< a5efc95a33bd4fcb879250852828cc58c7862970 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 9030a91235ae4845ec71902c3e0cecfc9ed1f2df affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< d06476714d2819b550e0cc39222347e2c8941c9d affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< c1175c4ad01dbc9c979d099861fa90a754f72059 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 51eb3b65544c9efd6a1026889ee5fb5aa62da3bb affected
… +10 more rows
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I. Basic Information for CVE-2025-38177

Vulnerability Information
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Vulnerability Title
sch_hfsc: make hfsc_qlen_notify() idempotent
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sch_hfsc: make hfsc_qlen_notify() idempotent hfsc_qlen_notify() is not idempotent either and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life: 1. update_vf() decreases cl->cl_nactive, so we can check whether it is non-zero before calling it. 2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
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hfsc_qlen_notify非幂等操作，可能导致资源管理问题。
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 959466588aa7f84ccf79ae36a1d89542eaf9aaec ~ 9a5fd5c2f4d4afdd5e405083ee53e0789ce76956 -
Linux Linux 4.14 -

II. Public POCs for CVE-2025-38177

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III. Intelligence Information for CVE-2025-38177

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Patches & Fixes for CVE-2025-38177 (1)

Same Patch Batch · Linux · 2025-07-04 · 59 CVEs total

CVE-2025-38209 9.8 CRITICAL nvme-tcp: remove tag set when second admin queue config fails
CVE-2025-38211 9.8 CRITICAL RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction
CVE-2025-38174 8.8 HIGH thunderbolt: Do not double dequeue a configuration request
CVE-2025-38216 8.8 HIGH iommu/vt-d: Restore context entry setup order for aliased devices
CVE-2025-38233 7.8 HIGH powerpc64/ftrace: fix clobbered r15 during livepatching
CVE-2025-38230 7.8 HIGH jfs: validate AG parameters in dbMount() to prevent crashes
CVE-2025-38227 7.8 HIGH media: vidtv: Terminating the subsequent process of initialization failure
CVE-2025-38226 7.8 HIGH media: vivid: Change the siize of the composing
CVE-2025-38224 7.8 HIGH can: kvaser_pciefd: refine error prone echo_skb_max handling logic
CVE-2025-38218 7.8 HIGH f2fs: fix to do sanity check on sit_bitmap_size
CVE-2025-38232 7.8 HIGH NFSD: fix race between nfsd registration and exports_proc
CVE-2025-38212 7.8 HIGH ipc: fix to protect IPCS lookups using RCU
CVE-2025-38175 7.8 HIGH binder: fix yet another UAF in binder_devices
CVE-2025-38234 7.8 HIGH sched/rt: Fix race in push_rt_task
CVE-2025-38206 7.8 HIGH exfat: fix double free in delayed_free
CVE-2025-38204 7.8 HIGH jfs: fix array-index-out-of-bounds read in add_missing_indices
CVE-2025-38192 7.8 HIGH net: clear the dst when changing skb protocol
CVE-2025-38189 7.8 HIGH drm/v3d: Avoid NULL pointer dereference in `v3d_job_update_stats()`
CVE-2025-38187 7.8 HIGH drm/nouveau: fix a use-after-free in r535_gsp_rpc_push()
CVE-2025-38193 7.8 HIGH net_sched: sch_sfq: reject invalid perturb period

Showing top 20 of 59 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38177

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