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.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

No data.

No data.

No data.

References
Link Providers
https://git.kernel.org/stable/c/20f68e6a9e41693cb0e55e5b9ebbcb40983a4b8f cve-icon cve-icon
https://git.kernel.org/stable/c/3aaa7c01cf19d9b9bb64b88b65c3a6fd05da2eb4 cve-icon cve-icon
https://git.kernel.org/stable/c/4483d8b9127591c60c4eb789d6cab953bc4522a9 cve-icon cve-icon
https://git.kernel.org/stable/c/46c15c9d0f65c9ba857d63f53264f4b17e8a715f cve-icon cve-icon
https://git.kernel.org/stable/c/53d11560e957d53ee87a0653d258038ce12361b7 cve-icon cve-icon
https://git.kernel.org/stable/c/93f9eeb678d4c9c1abf720b3615fa8299a490845 cve-icon cve-icon
https://git.kernel.org/stable/c/d35acc1be3480505b5931f17e4ea9b7617fea4d3 cve-icon cve-icon
https://git.kernel.org/stable/c/e3f6745006dc9423d2b065b90f191cfa11b1b584 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2025062055-CVE-2025-38083-b226@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-38083 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-38083 cve-icon
History

Fri, 27 Jun 2025 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-366
Metrics cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

 cvssV3_1

{'score': 6.3, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H'}

Fri, 27 Jun 2025 10:45:00 +0000

Type Values Removed Values Added
References

Sat, 21 Jun 2025 12:45:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 7.0, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'}

threat_severity

Moderate

Fri, 20 Jun 2025 11:30:00 +0000

Type Values Removed Values Added
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.
Title net_sched: prio: fix a race in prio_tune()
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2025-06-20T11:21:51.554Z

Updated: 2025-06-27T10:21:23.980Z

Reserved: 2025-04-16T04:51:23.981Z

Link: CVE-2025-38083

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-06-20T12:15:21.470

Modified: 2025-06-27T11:15:25.267

Link: CVE-2025-38083

cve-icon Redhat

Severity : Moderate

Publid Date: 2025-06-20T00:00:00Z

Links: CVE-2025-38083 - Bugzilla