CVE-2025-21703
Last modified
CVE-2025-21703 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: netem: Update sch->q.qlen before qdisc_tree_reduce_backlog() qdisc_tree_reduce_backlog() notifies parent qdisc only if child qdisc becomes empty, therefore we need to reduce the backlog of the child qdisc before calling it. Otherwise it would miss the opportunity to call cops->qlen_notify(), in the case of DRR, it resulted in UAF since DRR uses ->qlen_notify() to maintain its active list.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 5.4.288, < 5.4.291 | — |
| Linux | Linux Kernel | >= 5.10.232, < 5.10.235 | — |
| Linux | Linux Kernel | >= 5.15.175, < 5.15.179 | — |
| Linux | Linux Kernel | >= 6.1.121, < 6.1.129 | — |
| Linux | Linux Kernel | >= 6.6.67, < 6.6.78 | — |
| Linux | Linux Kernel | >= 6.12.6, < 6.12.14 | — |
| Linux | Linux Kernel | >= 6.13, < 6.13.3 | — |
| Linux | Linux Kernel | 6.14 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-21703?
How severe is CVE-2025-21703?
How do I fix CVE-2025-21703?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2025
- CVE-2025-21698Rejected reason: This CVE ID has been rejected or withdrawn …
- CVE-2025-21699In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-2170A Server-side request forgery (SSRF) vulnerability has been …7.2
- CVE-2025-21700In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2025-21701In the Linux kernel, the following vulnerability has been re…4.7
- CVE-2025-21702In the Linux kernel, the following vulnerability has been re…7
- CVE-2025-21704In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2025-21705In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-21706In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-21707In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-21708In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2025-21709In the Linux kernel, the following vulnerability has been re…5.5
Are you affected by CVE-2025-21703?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST