CVE-2023-39193: Kernel: netfilter: xtables sctp out-of-bounds read in match_flags()

Modified

AliasesUBUNTU-CVE-2023-39193DEBIAN-CVE-2023-39193

Published 09-10-2023Last modified 14-10-2026

Vulnerability summary

CVE-2023-39193 is a medium (CVSS 6.1) Out-of-bounds Read vulnerability in fedoraproject fedora. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 36.7% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 6.1, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.1/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.42%

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

09-10-2023
PublishedVulnerability first disclosed.
14-10-2026
Last modifiedVulnerability information updated.

Description

A flaw was found in the Netfilter subsystem in the Linux kernel. The sctp_mt_check did not validate the flag_count field. This flaw allows a local privileged (CAP_NET_ADMIN) attacker to trigger an out-of-bounds read, leading to a crash or information disclosure.

CVSS metrics

5 scores · 4 sources · 2 versions

v4.04.8v3.16.1

EPSS trend

Probability

0.42%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

Increase +0.02 pp

From 0.40% 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-125Out-of-bounds ReadThe product reads 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.

Ubuntu107 products

linuxAll versions (No fix recorded) | < 4.4.0-248.282 | < 4.15.0-220.231 | < 5.4.0-169.187 | < 5.15.0-91.101
linux-allwinner-5.19All versions (No fix recorded)
linux-aws< 4.4.0-1125.131 | < 4.4.0-1163.178 | < 4.15.0-1163.176 | < 5.4.0-1116.126 | < 5.15.0-1051.56
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< 5.15.0-1051.56~20.04.1
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1116.126~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.2< 6.2.0-1017.17~22.04.1
linux-aws-fips< 4.15.0-2102.108 | All versions (No fix recorded) | < 5.4.0-1116.126+fips1
linux-aws-hwe< 4.15.0-1163.176~16.04.1
linux-azure< 4.15.0-1172.187~14.04.1 | < 4.15.0-1172.187~16.04.1 | All versions (No fix recorded) | < 5.4.0-1121.128 | < 5.15.0-1053.61
linux-azure-4.15< 4.15.0-1172.187
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1053.61~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1121.128~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-6.2< 6.2.0-1018.18~22.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 5.15.0-1053.61.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fde-6.2< 6.2.0-1018.18~22.04.1.1
linux-azure-fips< 4.15.0-2081.87 | All versions (No fix recorded) | < 5.4.0-1121.128+fips1
linux-bluefield< 5.4.0-1076.82 | < 5.15.0-1033.35
linux-fips< 4.4.0-1095.102 | All versions (No fix recorded) | < 4.15.0-1118.129 | < 5.4.0-1090.100
linux-gcp< 4.15.0-1157.174~16.04.1 | All versions (No fix recorded) | < 5.4.0-1120.129 | < 5.15.0-1048.56
linux-gcp-4.15< 4.15.0-1157.174
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1048.56~20.04.1
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1120.129~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.2< 6.2.0-1021.23~22.04.1
linux-gcp-fips< 4.15.0-2065.70 | All versions (No fix recorded) | < 5.4.0-1120.129+fips1
linux-gkeAll versions (No fix recorded) | < 5.15.0-1048.53
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< 5.4.0-1083.87 | < 5.15.0-1034.40
linux-gkeop-5.15< 5.15.0-1034.40~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hwe< 4.15.0-220.231~16.04.1 | 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< 5.15.0-91.101~20.04.1
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-169.187~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.2< 6.2.0-39.40~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1063.68 | < 5.15.0-1044.47
linux-ibm-5.15< 5.15.0-1044.47~20.04.1
linux-ibm-5.4< 5.4.0-1063.68~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1044.46
linux-intel-iotg< 5.15.0-1046.52
linux-intel-iotg-5.15< 5.15.0-1046.52~20.04.1
linux-iot< 5.4.0-1028.29
linux-kvm< 4.4.0-1126.136 | < 4.15.0-1147.152 | < 5.4.0-1104.111 | < 5.15.0-1048.53
linux-lowlatency< 5.15.0-91.101
linux-lowlatency-hwe-5.15< 5.15.0-91.101~20.04.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.2< 6.2.0-1018.18~22.04.1
linux-lts-xenial< 4.4.0-248.282~14.04.1
linux-nvidia< 5.15.0-1042.42
linux-nvidia-6.2< 6.2.0-1013.13
linux-nvidia-tegra< 5.15.0-1020.20
linux-nvidia-tegra-5.15< 5.15.0-1020.20~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1007.7
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-6.0All versions (No fix recorded)
linux-oem-6.1< 6.1.0-1023.23
linux-oem-6.5All versions (No fix recorded)
linux-oracle< 4.15.0-1126.137~16.04.1 | < 4.15.0-1126.137 | < 5.4.0-1115.124 | < 5.15.0-1049.55
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< 5.15.0-1049.55~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1115.124~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1100.112 | < 5.15.0-1044.47
linux-raspi-5.4< 5.4.0-1100.112~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1052.58
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1047.51~20.04.1
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-starfive-6.2All versions (No fix recorded)
linux-xilinx-zynqmp< 5.4.0-1035.39 | < 5.15.0-1027.31