CVE-2023-3611: Out-of-bounds write in Linux kernel's net/sched: sch_qfq component

Modified

AliasesUBUNTU-CVE-2023-3611DEBIAN-CVE-2023-3611

Published 21-07-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-3611 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.9% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

7.8/10

010

High · v3.1 (CVE.org)

EPSS score

0.29%

0%100%

Low · +0.02 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

21-07-2023
PublishedVulnerability first disclosed.
14-10-2026
Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

v3.17.8

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 0.27% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu105 products

linux< 3.13.0-193.244 | < 4.4.0-244.278 | < 4.15.0-216.227 | < 5.4.0-159.176 | < 5.15.0-82.91
linux-allwinner-5.19All versions (No fix recorded)
linux-aws< 4.4.0-1122.128 | < 4.4.0-1160.175 | < 4.15.0-1160.173 | < 5.4.0-1108.116 | < 5.15.0-1043.48
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)

linux-aws-5.13All versions (No fix recorded)
linux-aws-5.15< 5.15.0-1043.48~20.04.1
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1108.116~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.2< 6.2.0-1010.10~22.04.1
linux-aws-fips< 4.15.0-2099.105 | All versions (No fix recorded) | < 5.4.0-1108.116+fips1
linux-aws-hwe< 4.15.0-1160.173~16.04.1
linux-azure< 4.15.0-1169.184~14.04.1 | < 4.15.0-1169.184~16.04.1 | All versions (No fix recorded) | < 5.4.0-1114.120 | < 5.15.0-1045.52
linux-azure-4.15< 4.15.0-1169.184
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1045.52~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1115.122~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-6.2All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 5.15.0-1045.52.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fde-6.2All versions (No fix recorded)
linux-azure-fips< 4.15.0-2078.84 | All versions (No fix recorded) | < 5.4.0-1114.120+fips1
linux-bluefield< 5.4.0-1070.76 | < 5.15.0-1022.24
linux-fips< 4.4.0-1092.99 | All versions (No fix recorded) | < 4.15.0-1115.126 | < 5.4.0-1083.92
linux-gcp< 4.15.0-1154.171~16.04.1 | All versions (No fix recorded) | < 5.4.0-1111.120 | < 5.15.0-1040.48
linux-gcp-4.15< 4.15.0-1154.171
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1040.48~20.04.1
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1111.120~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.2All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2062.67 | All versions (No fix recorded) | < 5.4.0-1111.120+fips1
linux-gkeAll versions (No fix recorded) | < 5.15.0-1040.45
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.4.0-1075.79 | < 5.15.0-1026.31
linux-gkeop-5.15< 5.15.0-1026.31~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hwe< 4.15.0-216.227~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-82.91~20.04.1
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-159.176~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.2< 6.2.0-31.31~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1056.61 | < 5.15.0-1036.39
linux-ibm-5.15< 5.15.0-1036.39~20.04.1
linux-ibm-5.4< 5.4.0-1056.61~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1037.39
linux-intel-iotg< 5.15.0-1038.43
linux-intel-iotg-5.15< 5.15.0-1038.43~20.04.1
linux-iot< 5.4.0-1021.22
linux-kvm< 4.4.0-1123.133 | < 4.15.0-1144.149 | < 5.4.0-1097.103 | < 5.15.0-1040.45
linux-lowlatency< 5.15.0-82.91
linux-lowlatency-hwe-5.15< 5.15.0-82.91~20.04.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.2< 6.2.0-1011.11~22.04.1
linux-lts-xenial< 4.4.0-244.278~14.04.1
linux-nvidia< 5.15.0-1031.31
linux-nvidia-6.2All versions (No fix recorded)
linux-nvidia-tegra< 5.15.0-1017.17
linux-nvidia-tegra-5.15< 5.15.0-1017.17~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1004.4
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oem-6.0< 6.0.0-1021.21
linux-oem-6.1< 6.1.0-1019.19
linux-oracle< 4.15.0-1123.134~16.04.1 | < 4.15.0-1123.134 | < 5.4.0-1107.116 | < 5.15.0-1041.47
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1041.47~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1107.116~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1092.103 | < 5.15.0-1036.39
linux-raspi-5.4< 5.4.0-1092.103~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1044.49
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1039.43~20.04.2
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-starfive-5.19All versions (No fix recorded)
linux-xilinx-zynqmp< 5.4.0-1028.32 | < 5.15.0-1025.29

Show all 105

Debian2 products

linux< 6.1.52-1 | < 6.4.4-2
debian_linuxEOL10.0 | 11.0 | 12.0

Linux2 products

kernel≥ 3.8, < 6.5
linux_kernel≥ 3.8, < 4.14.322 | ≥ 4.15, < 4.19.291 | ≥ 4.20, < 5.4.253 | ≥ 5.5, < 5.10.188 | ≥ 5.11, < 5.15.121 | ≥ 5.16, < 6.1.40 | ≥ 6.2, < 6.4.5 | 6.5:rc1

3 vendors · 109 products