What’s Vulnerable › Vulnerabilities
CVE-2023-31436
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.6% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2023-04-28 · updated 2026-10-14
- Weakness: CWE-787
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.
Affected products
- Linux kernel: from 3.7 before 4.14.314; from 4.15 before 4.19.282; from 4.20 before 5.4.242; from 5.5.0 before 5.10.179; from 5.11 before 5.15.109; from 5.16 before 6.1.26 — fixed in 4.14.314, 4.19.282, 5.10.179, 5.15.109, 5.4.242, 6.1.26
How to fix
Upgrade to a fixed version: Linux kernel 4.14.314, 4.19.282, 5.10.179, 5.15.109. Check the vendor advisory for mitigations.
References
- http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.html
- http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.html
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.13
- https://github.com/torvalds/linux/commit/3037933448f60f9acb705997eae62013ecb81e0d
- https://lists.debian.org/debian-lts-announce/2023/06/msg00008.html
- https://security.netapp.com/advisory/ntap-20230609-0001/
- https://www.debian.org/security/2023/dsa-5402
- https://www.spinics.net/lists/stable-commits/msg294885.html
- http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.html
- http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.html
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
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