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CVE-2025-38083— net_sched: prio: fix a race in prio_tune()

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prio_tune函数存在竞争条件，可能导致qlen下溢。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< 53d11560e957d53ee87a0653d258038ce12361b7 affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< 4483d8b9127591c60c4eb789d6cab953bc4522a9 affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< 20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< 3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< 46c15c9d0f65c9ba857d63f53264f4b17e8a715f affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< e3f6745006dc9423d2b065b90f191cfa11b1b584 affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< 93f9eeb678d4c9c1abf720b3615fa8299a490845 affected
7b8e0b6e659983154c8d7e756cdb833d89a3d4d7< d35acc1be3480505b5931f17e4ea9b7617fea4d3 affected
… +10 more rows
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I. Basic Information for CVE-2025-38083

Vulnerability Information
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Vulnerability Title
net_sched: prio: fix a race in prio_tune()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net_sched: prio: fix a race in prio_tune() Gerrard Tai reported a race condition in PRIO, whenever SFQ perturb timer fires at the wrong time. The race is as follows: CPU 0 CPU 1 [1]: lock root [2]: qdisc_tree_flush_backlog() [3]: unlock root | | [5]: lock root | [6]: rehash | [7]: qdisc_tree_reduce_backlog() | [4]: qdisc_put() This can be abused to underflow a parent's qlen. Calling qdisc_purge_queue() instead of qdisc_tree_flush_backlog() should fix the race, because all packets will be purged from the qdisc before releasing the lock.
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prio_tune函数存在竞争条件，可能导致qlen下溢。
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 7b8e0b6e659983154c8d7e756cdb833d89a3d4d7 ~ 53d11560e957d53ee87a0653d258038ce12361b7 -
Linux Linux 5.0 -

II. Public POCs for CVE-2025-38083

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III. Intelligence Information for CVE-2025-38083

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38083

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