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CVE-2025-37913— net_sched: qfq: Fix double list add in class with netem as child qdisc

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调度器在netem子队列情况下可能重复添加分类器，可能导致内存损坏。

CVSS 7.8 · High EPSS 0.24% · P14

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 041f410aec2c1751ee22b8b73ba05d38c3a6a602 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 005a479540478a820c52de098e5e767e63e36f0a affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 0bf32d6fb1fcbf841bb9945570e0e2a70072c00f affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 0aa23e0856b7cedb3c88d8e3d281c212c7e4fbeb affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< a43783119e01849fbf2fe8855634e8989b240cb4 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 53bc0b55178bd59bdd4bcd16349505cabf54b1a2 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< 370218e8ce711684acc4cdd3cc3c6dd7956bc165 affected
37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea< f139f37dcdf34b67f5bf92bc8e0f7f6b3ac63aa4 affected
… +10 more rows
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I. Basic Information for CVE-2025-37913

Vulnerability Information
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Vulnerability Title
net_sched: qfq: Fix double list add in class with netem as child qdisc
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: qfq: Fix double list add in class with netem as child qdisc As described in Gerrard's report [1], there are use cases where a netem child qdisc will make the parent qdisc's enqueue callback reentrant. In the case of qfq, there won't be a UAF, but the code will add the same classifier to the list twice, which will cause memory corruption. This patch checks whether the class was already added to the agg->active list (cl_is_active) before doing the addition to cater for the reentrant case. [1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/
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调度器在netem子队列情况下可能重复添加分类器，可能导致内存损坏。
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 37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea ~ 041f410aec2c1751ee22b8b73ba05d38c3a6a602 -
Linux Linux 5.0 -

II. Public POCs for CVE-2025-37913

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III. Intelligence Information for CVE-2025-37913

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Patches & Fixes for CVE-2025-37913 (1)

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-2025-37913

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