CVE-2023-4244: Use-after-free in Linux kernel's netfilter: nf_tables component

Analyzed

AliasesUBUNTU-CVE-2023-4244DEBIAN-CVE-2023-4244

Published 06-09-2023Last modified 28-07-2026

Vulnerability summary

CVE-2023-4244 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 15.2% 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

0.24%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

06-09-2023
PublishedVulnerability first disclosed.
28-07-2026
Last modifiedVulnerability information updated.

Description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. Due to a race condition between nf_tables netlink control plane transaction and nft_set element garbage collection, it is possible to underflow the reference counter causing a use-after-free vulnerability. We recommend upgrading past commit 3e91b0ebd994635df2346353322ac51ce84ce6d8.

CVSS metrics

4 scores · 4 sources · 1 version

v3.17.8

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.24% 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-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

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

Ubuntu109 products

linuxAll versions (No fix recorded) | < 5.4.0-173.191 | < 5.15.0-87.97
linux-allwinner-5.19All versions (No fix recorded)
linux-awsAll versions (No fix recorded) | < 5.4.0-1120.130 | < 5.15.0-1048.53
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< 5.15.0-1048.53~20.04.1
linux-aws-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1120.130~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.2< 6.2.0-1014.14~22.04.1
linux-aws-6.5All versions (No fix recorded)
linux-aws-fipsAll versions (No fix recorded) | < 5.4.0-1120.130+fips1
linux-aws-hweAll versions (No fix recorded)
linux-azureAll versions (No fix recorded) | < 5.4.0-1126.133 | < 5.15.0-1050.57
linux-azure-4.15All versions (No fix recorded)
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1050.57~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1126.133~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-6.2< 6.2.0-1015.15~22.04.1
linux-azure-6.5All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 5.15.0-1050.57.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fipsAll versions (No fix recorded) | < 5.4.0-1126.133+fips1
linux-bluefield< 5.4.0-1080.87 | < 5.15.0-1028.30
linux-fipsAll versions (No fix recorded) | < 5.4.0-1094.104
linux-gcpAll versions (No fix recorded) | < 5.4.0-1124.133 | < 5.15.0-1045.53
linux-gcp-4.15All versions (No fix recorded)
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1045.53~20.04.2
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1124.133~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.2< 6.2.0-1017.19~22.04.1
linux-gcp-fipsAll versions (No fix recorded) | < 5.4.0-1124.133+fips1
linux-gkeAll versions (No fix recorded) | < 5.15.0-1045.50
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< 5.4.0-1087.91 | < 5.15.0-1031.37
linux-gkeop-5.15< 5.15.0-1031.37~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-87.97~20.04.1
linux-hwe-5.19All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-173.191~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.2< 6.2.0-35.35~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1067.72 | < 5.15.0-1041.44
linux-ibm-5.15< 5.15.0-1041.44~20.04.1
linux-ibm-5.4< 5.4.0-1067.72~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1041.43
linux-intel-iotg< 5.15.0-1043.49
linux-intel-iotg-5.15< 5.15.0-1043.49~20.04.1
linux-iot< 5.4.0-1032.33
linux-kvmAll versions (No fix recorded) | < 5.4.0-1108.115 | < 5.15.0-1045.50
linux-lowlatency< 5.15.0-87.96
linux-lowlatency-hwe-5.15< 5.15.0-87.96~20.04.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.2< 6.2.0-1015.15~22.04.1
linux-lts-xenialAll versions (No fix recorded)
linux-nvidia< 5.15.0-1039.39
linux-nvidia-6.2< 6.2.0-1011.11
linux-nvidia-6.5< 6.5.0-1007.7
linux-nvidia-tegra< 5.15.0-1019.19
linux-nvidia-tegra-5.15< 5.15.0-1019.19~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1006.6
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< 6.1.0-1025.25
linux-oem-6.5< 6.5.0-1008.8
linux-oracleAll versions (No fix recorded) | < 5.4.0-1119.128 | < 5.15.0-1046.52
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< 5.15.0-1046.52~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1119.128~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1104.116 | < 5.15.0-1041.44 | < 6.7.0-1001.1
linux-raspi-5.4< 5.4.0-1104.116~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1049.55
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1044.48~20.04.1
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-6.2< 6.2.0-1007.8~22.04.1
linux-xilinx-zynqmp< 5.4.0-1039.43 | < 5.15.0-1025.29

Show all 109

Debian2 products

linux< 6.1.55-1 | < 6.4.13-1
debian_linuxEOL10.0

Linux2 products

kernel≥ 0.0, < 4.19.316 | ≥ 4.20, < 5.4.262 | ≥ 5.5, < 5.10.198 | ≥ 5.11, < 5.15.134 | ≥ 5.16, < 6.1.56 | ≥ 6.2, < 6.4.11
linux_kernel< 4.19.316 | ≥ 4.20, < 5.4.262 | ≥ 5.5, < 5.10.198 | ≥ 5.11, < 5.15.134 | ≥ 5.16, < 6.1.56 | ≥ 6.2.0, < 6.4.11

3 vendors · 113 products