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CVE-2025-38193— net_sched: sch_sfq: reject invalid perturb period

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，该漏洞源于未验证扰动周期导致整数溢出。

CVSS 7.8 · High EPSS 0.21% · P10

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e0936ff56be4e08ad5b60ec26971eae0c40af305 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 2254d038dab9c194fe6a4b1ce31034f42e91a6e5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 956b5aebb349449b38d920d444ca1392d43719d1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b11a50544af691b787384089b68f740ae20a441b affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 0357da9149eac621f39e235a135ebf155f01f7c3 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f9b97d466e6026ccbdda30bb5b71965b67ccbc82 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 590b2d7d0beadba2aa576708a05a05f0aae39295 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7ca52541c05c832d32b112274f81a985101f9ba8 affected
… +10 more rows
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I. Basic Information for CVE-2025-38193

Vulnerability Information
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Vulnerability Title
net_sched: sch_sfq: reject invalid perturb period
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
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，该漏洞源于未验证扰动周期导致整数溢出。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ e0936ff56be4e08ad5b60ec26971eae0c40af305 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-38193

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III. Intelligence Information for CVE-2025-38193

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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-2025-38187 7.8 HIGH drm/nouveau: fix a use-after-free in r535_gsp_rpc_push()
CVE-2025-38180 7.8 HIGH net: atm: fix /proc/net/atm/lec handling
CVE-2025-38184 7.8 HIGH tipc: fix null-ptr-deref when acquiring remote ip of ethernet bearer

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-2025-38193

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