CVE-2025-39766— net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit
Affected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 046f6fd5daefac7f5abdafb436b30f63bc7c602b< 7689ab22de36f8db19095f6bdf11f28cfde92f5c | affected |
046f6fd5daefac7f5abdafb436b30f63bc7c602b< de04ddd2980b48caa8d7e24a7db2742917a8b280 | affected | ||
046f6fd5daefac7f5abdafb436b30f63bc7c602b< 0dacfc5372e314d1219f03e64dde3ab495a5a25e | affected | ||
046f6fd5daefac7f5abdafb436b30f63bc7c602b< 710866fc0a64eafcb8bacd91bcb1329eb7e5035f | affected | ||
046f6fd5daefac7f5abdafb436b30f63bc7c602b< aa12ee1c1bd260943fd6ab556d8635811c332eeb | affected | ||
046f6fd5daefac7f5abdafb436b30f63bc7c602b< ff57186b2cc39766672c4c0332323933e5faaa88 | affected | ||
046f6fd5daefac7f5abdafb436b30f63bc7c602b< 62d591dde4defb1333d202410609c4ddeae060b3 | affected | ||
046f6fd5daefac7f5abdafb436b30f63bc7c602b< 15de71d06a400f7fdc15bf377a2552b0ec437cf5 | affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2025-39766
Vulnerability Information
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Vulnerability Title
net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit The following setup can trigger a WARNING in htb_activate due to the condition: !cl->leaf.q->q.qlen tc qdisc del dev lo root tc qdisc add dev lo root handle 1: htb default 1 tc class add dev lo parent 1: classid 1:1 \ htb rate 64bit tc qdisc add dev lo parent 1:1 handle f: \ cake memlimit 1b ping -I lo -f -c1 -s64 -W0.001 127.0.0.1 This is because the low memlimit leads to a low buffer_limit, which causes packet dropping. However, cake_enqueue still returns NET_XMIT_SUCCESS, causing htb_enqueue to call htb_activate with an empty child qdisc. We should return NET_XMIT_CN when packets are dropped from the same tin and flow. I do not believe return value of NET_XMIT_CN is necessary for packet drops in the case of ack filtering, as that is meant to optimize performance, not to signal congestion.
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cake_enqueue在超过buffer_limit时未正确返回NET_XMIT_CN，可能导致错误触发htb_activate警告。
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-2025-39766
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-09-11 · 54 CVEs total
| CVE-2025-39774 | iio: adc: rzg2l_adc: Set driver data before enabling runtime PM | |
| CVE-2025-39791 | dm: dm-crypt: Do not partially accept write BIOs with zoned targets | |
| CVE-2025-39785 | drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local | |
| CVE-2025-39788 | scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE | |
| CVE-2025-39787 | soc: qcom: mdt_loader: Ensure we don't read past the ELF header | |
| CVE-2025-39786 | iio: adc: ad7173: fix channels index for syscalib_mode | |
| CVE-2025-39789 | crypto: x86/aegis - Add missing error checks | |
| CVE-2025-39777 | crypto: acomp - Fix CFI failure due to type punning | |
| CVE-2025-39776 | mm/debug_vm_pgtable: clear page table entries at destroy_args() | |
| CVE-2025-39775 | mm/mremap: fix WARN with uffd that has remap events disabled | |
| CVE-2025-39779 | btrfs: subpage: keep TOWRITE tag until folio is cleaned | |
| CVE-2025-39773 | net: bridge: fix soft lockup in br_multicast_query_expired() | |
| CVE-2025-39772 | drm/hisilicon/hibmc: fix the hibmc loaded failed bug | |
| CVE-2025-39771 | regulator: pca9450: Use devm_register_sys_off_handler | |
| CVE-2025-39770 | net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM | |
| CVE-2025-39769 | bnxt_en: Fix lockdep warning during rmmod | |
| CVE-2025-39768 | net/mlx5: HWS, fix complex rules rehash error flow | |
| CVE-2025-39767 | LoongArch: Optimize module load time by optimizing PLT/GOT counting | |
| CVE-2025-39765 | ALSA: timer: fix ida_free call while not allocated | |
| CVE-2025-39764 | netfilter: ctnetlink: remove refcounting in expectation dumpers |
Showing top 20 of 54 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-46333
ptrace: slightly saner 'get_dumpable()' logic - CVE-2026-43490
ksmbd: validate inherited ACE SID length - CVE-2026-43489
liveupdate: luo_file: remember retrieve() status - CVE-2026-43487
ata: libata-core: Disable LPM on ST1000DM010-2EP102 - CVE-2026-43488
usb: xhci: Prevent interrupt storm on host controller error
Same vendor: Linux
- CVE-2026-46333
ptrace: slightly saner 'get_dumpable()' logic - CVE-2026-43490
ksmbd: validate inherited ACE SID length - CVE-2026-43489
liveupdate: luo_file: remember retrieve() status - CVE-2026-43487
ata: libata-core: Disable LPM on ST1000DM010-2EP102 - CVE-2026-43488
usb: xhci: Prevent interrupt storm on host controller error
V. Comments for CVE-2025-39766
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