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7.8
HIGH CVSS 3.1
CVE-2025-37752
net_sched: sch_sfq: move the limit validation
Description

In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375

INFO

Published Date :

May 1, 2025, 1:15 p.m.

Last Modified :

Nov. 4, 2025, 6:04 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-37752 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
1 Debian debian_linux
: Total Affected Vendor : 2 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH [email protected]
Solution
Update the Linux kernel to resolve an out-of-bounds array access vulnerability in sch_sfq.
  • Update the Linux kernel to the latest stable version.
  • Apply the specific patch addressing the sch_sfq vulnerability.
  • Recompile the kernel if necessary.
  • Reboot the system to apply kernel changes.
Public PoC/Exploit Available at Github

CVE-2025-37752 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-37752.

URL Resource
https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49 Patch
https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d Patch
https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219 Patch
https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688 Patch
https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4 Patch
https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9 Patch
https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70 Patch
https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a Patch
https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8 Patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html Mailing List
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-37752 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-37752 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
P3gEcTH8uJiYFVKb7lIn/awesome-list

Forked from https://github.com/0xor0ne/awesome-list.git

Updated: 3 weeks, 6 days ago
0 stars 0 fork 0 watcher
Born at : Oct. 10, 2025, 9:01 a.m. This repo has been linked 102 different CVEs too.
Profile Photo
kolaarionvull/awesome-list

Forked from https://github.com/0xor0ne/awesome-list.git

Updated: 3 weeks, 6 days ago
1 stars 0 fork 0 watcher
Born at : Oct. 6, 2025, 2:32 p.m. This repo has been linked 102 different CVEs too.
Profile Photo
0xor0ne/awesome-list

Cybersecurity oriented awesome list

awesome awesome-list cybersecurity exploitation reverse-engineering

Updated: 1 week, 6 days ago
2658 stars 276 fork 276 watcher
Born at : May 6, 2022, 6:02 p.m. This repo has been linked 104 different CVEs too.
Profile Photo
xairy/linux-kernel-exploitation

A collection of links related to Linux kernel security and exploitation

linux-kernel kernel-exploitation exploit privilege-escalation security

Updated: 6 hours, 42 minutes ago
6197 stars 971 fork 971 watcher
Born at : Nov. 13, 2016, 10:21 p.m. This repo has been linked 314 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-37752 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-37752 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Nov. 04, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-129
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.14 up to (excluding) 6.14.3 *cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.1.129 up to (excluding) 6.1.135 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.12.13 up to (excluding) 6.12.24 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13.2 up to (excluding) 6.13.12 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.6.76 up to (excluding) 6.6.88
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8 Types: Patch
    Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html Types: Mailing List
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 03, 2025

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 28, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 27, 2025

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/6c589aa318023690f1606c666a7fb5f4c1c9c219
    Added Reference https://git.kernel.org/stable/c/7d62ded97db6b7c94c891f704151f372b1ba4688
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 01, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375
    Added Reference https://git.kernel.org/stable/c/1348214fa042a71406964097e743c87a42c85a49
    Added Reference https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d
    Added Reference https://git.kernel.org/stable/c/b36a68192037d1614317a09b0d78c7814e2eecf9
    Added Reference https://git.kernel.org/stable/c/b3bf8f63e6179076b57c9de660c9f80b5abefe70
    Added Reference https://git.kernel.org/stable/c/d2718324f9e329b10ddc091fba5a0ba2b9d4d96a
    Added Reference https://git.kernel.org/stable/c/f86293adce0c201cfabb283ef9d6f21292089bb8
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact