CVE-2023-31436
HIGHCVSS 7.8/10EPSS 0.58%
Last modified
CVE-2023-31436 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. qfq_change_class in net/sched/sch_qfq.c in the Linux kernel before 6.2.13 allows an out-of-bounds write because lmax can exceed QFQ_MIN_LMAX.. EPSS estimates a 0.58% chance of exploitation in the next 30 days.
Description
qfq_change_class in net/sched/sch_qfq.c in the Linux kernel before 6.2.13 allows an out-of-bounds write because lmax can exceed QFQ_MIN_LMAX.
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 |
|---|---|---|
| Linux | Linux Kernel | >= 3.7, < 4.14.314 |
| Linux | Linux Kernel | >= 4.15, < 4.19.282 |
| Linux | Linux Kernel | >= 4.20, < 5.4.242 |
| Linux | Linux Kernel | >= 5.5.0, < 5.10.179 |
| Linux | Linux Kernel | >= 5.11, < 5.15.109 |
| Linux | Linux Kernel | >= 5.16, < 6.1.26 |
| Linux | Linux Kernel | >= 6.2, < 6.2.13 |
References
- http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.htmlThird Party Advisory, VDB Entry
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.13Mailing List, Patch
- https://lists.debian.org/debian-lts-announce/2023/06/msg00008.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230609-0001/Third Party Advisory
- https://www.spinics.net/lists/stable-commits/msg294885.htmlMailing List, Patch
- http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.htmlThird Party Advisory, VDB Entry
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.13Mailing List, Patch
- https://lists.debian.org/debian-lts-announce/2023/06/msg00008.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230609-0001/Third Party Advisory
- https://www.spinics.net/lists/stable-commits/msg294885.htmlMailing List, Patch
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2023-31436?
qfq_change_class in net/sched/sch_qfq.c in the Linux kernel before 6.2.13 allows an out-of-bounds write because lmax can exceed QFQ_MIN_LMAX.
How severe is CVE-2023-31436?
CVE-2023-31436 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.58% probability of exploitation in the next 30 days.
How do I fix CVE-2023-31436?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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.
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