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CVE-2025-37798— codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

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codel中删除了不必要的qlen检查。

CVSS 7.8 · High EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1564 · Hide Artifacts

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 76e3cc126bb223013a6b9a0e2a51238d1ef2e409< 7a742a9506849d1c1aa71e36c89855ceddc7d58e affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< cc71a757da78dd4aa1b4a9b19cb011833730ccf2 affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450 affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< 829c49b6b2ff45b043739168fd1245e4e1a91a30 affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< 2f9761a94bae33d26e6a81b31b36e7d776d93dc1 affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< 4d55144b12e742404bb3f8fee6038bafbf45619d affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< e73c838c80dccb9e4f19becc11d9f3cb4a27d483 affected
76e3cc126bb223013a6b9a0e2a51238d1ef2e409< a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31 affected
… +12 more rows
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I. Basic Information for CVE-2025-37798

Vulnerability Information
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Vulnerability Title
codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() After making all ->qlen_notify() callbacks idempotent, now it is safe to remove the check of qlen!=0 from both fq_codel_dequeue() and codel_qdisc_dequeue().
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codel中删除了不必要的qlen检查。
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 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 ~ 7a742a9506849d1c1aa71e36c89855ceddc7d58e -
Linux Linux 3.5 -

II. Public POCs for CVE-2025-37798

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III. Intelligence Information for CVE-2025-37798

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Patches & Fixes for CVE-2025-37798 (6)

Same Patch Batch · Linux · 2025-05-02 · 107 CVEs total

CVE-2023-53116 9.8 CRITICAL nvmet: avoid potential UAF in nvmet_req_complete()
CVE-2023-53083 9.8 CRITICAL nfsd: don't replace page in rq_pages if it's a continuation of last page
CVE-2023-53086 8.8 HIGH wifi: mt76: connac: do not check WED status for non-mmio devices
CVE-2023-53046 7.8 HIGH Bluetooth: Fix race condition in hci_cmd_sync_clear
CVE-2023-53057 7.8 HIGH Bluetooth: HCI: Fix global-out-of-bounds
CVE-2023-53065 7.8 HIGH perf/core: Fix perf_output_begin parameter is incorrectly invoked in perf_event_bpf_output
CVE-2023-53072 7.8 HIGH mptcp: use the workqueue to destroy unaccepted sockets
CVE-2023-53080 7.8 HIGH xsk: Add missing overflow check in xdp_umem_reg
CVE-2023-53084 7.8 HIGH drm/shmem-helper: Remove another errant put in error path
CVE-2023-53052 7.8 HIGH cifs: fix use-after-free bug in refresh_cache_worker()
CVE-2023-53087 7.8 HIGH drm/i915/active: Fix misuse of non-idle barriers as fence trackers
CVE-2023-53088 7.8 HIGH mptcp: fix UaF in listener shutdown
CVE-2023-53047 7.8 HIGH tee: amdtee: fix race condition in amdtee_open_session
CVE-2023-53107 7.8 HIGH veth: Fix use after free in XDP_REDIRECT
CVE-2025-37797 7.8 HIGH net_sched: hfsc: Fix a UAF vulnerability in class handling
CVE-2023-53138 7.8 HIGH net: caif: Fix use-after-free in cfusbl_device_notify()
CVE-2023-53111 7.8 HIGH loop: Fix use-after-free issues
CVE-2023-53039 7.8 HIGH HID: intel-ish-hid: ipc: Fix potential use-after-free in work function
CVE-2023-53090 7.8 HIGH drm/amdkfd: Fix an illegal memory access
CVE-2023-53100 7.8 HIGH ext4: fix WARNING in ext4_update_inline_data

Showing top 20 of 107 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37798

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