Back to CVE records
High 7.8Published Apr 28, 2023
CVE-2023-31436qfq_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.
Updated under an hour ago ()
Does this affect you?
It affects Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Start free and add your stack
Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1 | CISA ADP |
linux linux_kernel linux: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; from 6.2 before 6.2.13 | NVD |
References
- https://github.com/torvalds/linux/commit/3037933448f60f9acb705997eae62013ecb81e0dpatch
- https://www.spinics.net/lists/stable-commits/msg294885.htmlmailing-list, patch
- https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.13mailing-list, patch
- https://www.debian.org/security/2023/dsa-5402vendor-advisory, vdb-entry
- 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
- 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
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html
- https://cert-portal.siemens.com/productcert/html/ssa-806742.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.