Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2025-21657— sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()

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sched_ext模块中scx_ops_bypass函数使用了不合适的锁。这可能导致不必要的警告或调度问题。

AI Predicted 5.5 Difficulty: Trivial EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1053 · Scheduled Task/Job

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux 0e7ffff1b8117b05635c87d3c9099f6aa9c9b689< d9e446dd63cee7161717a6a8414ba9c6435af764 affected
0e7ffff1b8117b05635c87d3c9099f6aa9c9b689< 6268d5bc10354fc2ab8d44a0cd3b042d49a0417e affected
6.12 affected
< 6.12 unaffected
6.12.10≤ 6.12.* unaffected
6.13≤ * unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-21657

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass() scx_ops_bypass() iterates all CPUs to re-enqueue all the scx tasks. For each CPU, it acquires a lock using rq_lock() regardless of whether a CPU is offline or the CPU is currently running a task in a higher scheduler class (e.g., deadline). The rq_lock() is supposed to be used for online CPUs, and the use of rq_lock() may trigger an unnecessary warning in rq_pin_lock(). Therefore, replace rq_lock() to raw_spin_rq_lock() in scx_ops_bypass(). Without this change, we observe the following warning: ===== START ===== [ 6.615205] rq->balance_callback && rq->balance_callback != &balance_push_callback [ 6.615208] WARNING: CPU: 2 PID: 0 at kernel/sched/sched.h:1730 __schedule+0x1130/0x1c90 ===== END =====
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sched_ext模块中scx_ops_bypass函数使用了不合适的锁。这可能导致不必要的警告或调度问题。
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 0e7ffff1b8117b05635c87d3c9099f6aa9c9b689 ~ d9e446dd63cee7161717a6a8414ba9c6435af764 -
Linux Linux 6.12 -

II. Public POCs for CVE-2025-21657

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2025-21657

请登录查看更多情报信息。

Patches & Fixes for CVE-2025-21657 (2)

Same Patch Batch · Linux · 2025-01-21 · 25 CVEs total

CVE-2025-21663 10.0 CRITICAL net: stmmac: dwmac-tegra: Read iommu stream id from device tree
CVE-2024-57932 9.8 CRITICAL gve: guard XDP xmit NDO on existence of xdp queues
CVE-2024-57936 9.8 CRITICAL RDMA/bnxt_re: Fix max SGEs for the Work Request
CVE-2025-21659 8.1 HIGH netdev: prevent accessing NAPI instances from another namespace
CVE-2025-21664 7.8 HIGH dm thin: make get_first_thin use rcu-safe list first function
CVE-2025-21661 7.8 HIGH gpio: virtuser: fix missing lookup table cleanups
CVE-2024-57945 7.8 HIGH riscv: mm: Fix the out of bound issue of vmemmap address
CVE-2024-57943 exfat: fix the new buffer was not zeroed before writing
CVE-2024-57946 virtio-blk: don't keep queue frozen during system suspend
CVE-2025-21662 net/mlx5: Fix variable not being completed when function returns
CVE-2025-21660 ksmbd: fix unexpectedly changed path in ksmbd_vfs_kern_path_locked
CVE-2025-21658 btrfs: avoid NULL pointer dereference if no valid extent tree
CVE-2025-21656 hwmon: (drivetemp) Fix driver producing garbage data when SCSI errors occur
CVE-2024-57944 iio: adc: ti-ads1298: Add NULL check in ads1298_init
CVE-2024-57930 tracing: Have process_string() also allow arrays
CVE-2024-57942 netfs: Fix ceph copy to cache on write-begin
CVE-2024-57941 netfs: Fix the (non-)cancellation of copy when cache is temporarily disabled
CVE-2024-57940 exfat: fix the infinite loop in exfat_readdir()
CVE-2024-57939 riscv: Fix sleeping in invalid context in die()
CVE-2024-57938 net/sctp: Prevent autoclose integer overflow in sctp_association_init()

Showing top 20 of 25 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21657

No comments yet

Leave a comment