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CVE-2025-37932— sch_htb: make htb_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sch_htb中htb_qlen_notify非幂等。

AI Predicted 5.5 Difficulty: Theoretical EPSS 0.24% · P14

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 959466588aa7f84ccf79ae36a1d89542eaf9aaec< e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 32ae12ce6a9f6bace186ca7335220ff59b6cc3cd affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 967955c9e57f8eebfccc298037d4aaf3d42bc1c9 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 73cf6af13153d62f9b76eff422eea79dbc70f15e affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< bbbf5e0f87078b715e7a665d662a2c0e77f044ae affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 0a188c0e197383683fd093ab1ea6ce9a5869a6ea affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< a61f1b5921761fbaf166231418bc1db301e5bf59 affected
959466588aa7f84ccf79ae36a1d89542eaf9aaec< 5ba8b837b522d7051ef81bacf3d95383ff8edce5 affected
… +10 more rows
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I. Basic Information for CVE-2025-37932

Vulnerability Information
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Vulnerability Title
sch_htb: make htb_qlen_notify() idempotent
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sch_htb: make htb_qlen_notify() idempotent htb_qlen_notify() always deactivates the HTB class and in fact could trigger a warning if it is already deactivated. Therefore, it is not idempotent and not friendly to its callers, like fq_codel_dequeue(). Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers' life.
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
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sch_htb中htb_qlen_notify非幂等。
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 ~ e6b45f4de763b00dc1c55e685e2dd1aaf525d3c1 -
Linux Linux 4.14 -

II. Public POCs for CVE-2025-37932

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III. Intelligence Information for CVE-2025-37932

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Same Patch Batch · Linux · 2025-05-20 · 95 CVEs total

CVE-2025-37894 9.8 CRITICAL net: use sock_gen_put() when sk_state is TCP_TIME_WAIT
CVE-2025-37924 9.8 CRITICAL ksmbd: fix use-after-free in kerberos authentication
CVE-2025-37935 9.8 CRITICAL net: ethernet: mtk_eth_soc: fix SER panic with 4GB+ RAM
CVE-2025-37959 9.4 CRITICAL bpf: Scrub packet on bpf_redirect_peer
CVE-2025-37926 8.8 HIGH ksmbd: fix use-after-free in ksmbd_session_rpc_open
CVE-2025-37899 8.8 HIGH ksmbd: fix use-after-free in session logoff
CVE-2025-37918 8.8 HIGH Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue()
CVE-2025-37944 8.8 HIGH wifi: ath12k: Fix invalid entry fetch in ath12k_dp_mon_srng_process
CVE-2025-37943 8.8 HIGH wifi: ath12k: Fix invalid data access in ath12k_dp_rx_h_undecap_nwifi
CVE-2025-37947 8.8 HIGH ksmbd: prevent out-of-bounds stream writes by validating *pos
CVE-2025-37952 8.8 HIGH ksmbd: Fix UAF in __close_file_table_ids
CVE-2025-37956 8.8 HIGH ksmbd: prevent rename with empty string
CVE-2025-37957 8.8 HIGH KVM: SVM: Forcibly leave SMM mode on SHUTDOWN interception
CVE-2025-37936 8.7 HIGH perf/x86/intel: KVM: Mask PEBS_ENABLE loaded for guest with vCPU's value.
CVE-2025-37973 8.1 HIGH wifi: cfg80211: fix out-of-bounds access during multi-link element defragmentation
CVE-2025-37903 7.8 HIGH drm/amd/display: Fix slab-use-after-free in hdcp
CVE-2025-37901 7.8 HIGH irqchip/qcom-mpm: Prevent crash when trying to handle non-wake GPIOs
CVE-2025-37923 7.8 HIGH tracing: Fix oob write in trace_seq_to_buffer()
CVE-2025-37921 7.8 HIGH vxlan: vnifilter: Fix unlocked deletion of default FDB entry
CVE-2025-37920 7.8 HIGH xsk: Fix race condition in AF_XDP generic RX path

Showing top 20 of 95 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37932

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