CVE-2023-31436
HIGH
7.8
CVSS Score
Published: April 28, 2023 at 12:00 AM UTC
Updated: October 14, 2026 at 11:17 PM UTC
1 product affected across 1 vendorLinux Kernel
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Severity
HIGH7.8
Exploit prediction
EPSS 0.6%
SSVC
No known exploit
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
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
3.7 ≤ v < 4.14.3144.15 ≤ v < 4.19.2824.20 ≤ v < 5.4.2425.11 ≤ v < 5.15.1095.16 ≤ v < 6.1.265.5.0 ≤ v < 5.10.1796.2 ≤ v < 6.2.13
Affected range stops below 4.14.314, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.19.282, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.10.179, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.15.109, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.242, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.26, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.2.13, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (11)
Third Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/173087/Kernel-Live-Patch-Security-Notice-LSN-0095-1.htmlThird Party AdvisoryVDB Entry
Source: [email protected]
http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.htmlMailing ListPatch
Source: [email protected]
https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.2.13Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2023/06/msg00008.htmlThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20230609-0001/SSVC — Action Prioritization
SSVCNo known exploitNot automatableTotal impact
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
7.8HIGHCISA-ADP
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- HIGH
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-787
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