CVE-2025-37913— net_sched: qfq: Fix double list add in class with netem as child qdisc
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2025-37913
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Same Patch Batch · Linux · 2025-05-20 · 95 CVEs total
| CVE-2025-37924 | 9.8 CRITICAL | ksmbd: fix use-after-free in kerberos authentication |
| CVE-2025-37958 | mm/huge_memory: fix dereferencing invalid pmd migration entry | |
| CVE-2025-37954 | smb: client: Avoid race in open_cached_dir with lease breaks | |
| CVE-2025-37953 | sch_htb: make htb_deactivate() idempotent | |
| CVE-2025-37949 | xenbus: Use kref to track req lifetime | |
| CVE-2025-37948 | arm64: bpf: Add BHB mitigation to the epilogue for cBPF programs | |
| CVE-2025-37947 | ksmbd: prevent out-of-bounds stream writes by validating *pos | |
| CVE-2025-37946 | s390/pci: Fix duplicate pci_dev_put() in disable_slot() when PF has child VFs | |
| CVE-2025-37945 | net: phy: allow MDIO bus PM ops to start/stop state machine for phylink-controlled PHY | |
| CVE-2025-37950 | ocfs2: fix panic in failed foilio allocation | |
| CVE-2025-37957 | KVM: SVM: Forcibly leave SMM mode on SHUTDOWN interception | |
| CVE-2025-37956 | ksmbd: prevent rename with empty string | |
| CVE-2025-37960 | memblock: Accept allocated memory before use in memblock_double_array() | |
| CVE-2025-37959 | bpf: Scrub packet on bpf_redirect_peer | |
| CVE-2025-37961 | ipvs: fix uninit-value for saddr in do_output_route4 | |
| CVE-2025-37963 | arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users | |
| CVE-2025-37962 | ksmbd: fix memory leak in parse_lease_state() | |
| CVE-2025-37964 | x86/mm: Eliminate window where TLB flushes may be inadvertently skipped | |
| CVE-2025-37965 | drm/amd/display: Fix invalid context error in dml helper | |
| CVE-2025-37967 | usb: typec: ucsi: displayport: Fix deadlock |
Showing top 20 of 95 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2025-37913
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