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CVE-2023-3611

Out-of-bounds write in Linux kernel's net/sched: sch_qfq component

HIGH
7.8
CVSS Score
Published: July 21, 2023 at 08:49 PM UTC
Updated: October 14, 2026 at 10:17 PM UTC
2 products affected across 2 vendorsLinux KernelDebian Linux

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Severity
HIGH7.8
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

An out-of-bounds write vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. The qfq_change_agg() function in net/sched/sch_qfq.c allows an out-of-bounds write because lmax is updated according to packet sizes without bounds checks. We recommend upgrading past commit 3e337087c3b5805fe0b8a46ba622a962880b5d64.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.011.012.0
Linux Kernel· Linux
95%
3.8 ≤ v < 4.14.3224.15 ≤ v < 4.19.2914.20 ≤ v < 5.4.2535.11 ≤ v < 5.15.1215.16 ≤ v < 6.1.405.5 ≤ v < 5.10.1886.2 ≤ v < 6.4.53.86.56.5 rc1
Affected range stops below 4.14.322, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.19.291, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.10.188, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.15.121, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.4.253, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.1.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.5, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.5, so it looks safe — our inference, not a vendor statement

References (12)

PatchMailing ListVendor Advisory
Source: [email protected]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e337087c3b5805fe0b8a46ba622a962880b5d64
PatchVendor Advisory
Source: [email protected]
https://kernel.dance/3e337087c3b5805fe0b8a46ba622a962880b5d64
Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
Mailing List
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
Third Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20230908-0002/
Vendor AdvisoryThird Party Advisory
Source: [email protected]
https://www.debian.org/security/2023/dsa-5480
Third Party Advisory
Source: [email protected]
https://www.debian.org/security/2023/dsa-5492
Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHGoogle
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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