CVE-2023-3439: linux linux_kernel Use After Free

Analyzed

AliasesUBUNTU-CVE-2023-3439DEBIAN-CVE-2023-3439

Published 28-06-2023Last modified 10-03-2025

Vulnerability summary

CVE-2023-3439 is a medium (CVSS 4.7) Use After Free vulnerability in linux linux_kernel. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 26.7% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 4.7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

4.7/10

010

Medium · v3.1 (CVE.org)

EPSS score

0.33%

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

Advisory lineage

Upstream 0 · Downstream 2 · Related 2

USN-6246-1 USN-6255-1

Timeline

28-06-2023
PublishedVulnerability first disclosed.
10-03-2025
Last modifiedVulnerability information updated.

Description

A flaw was found in the MCTP protocol in the Linux kernel. The function mctp_unregister() reclaims the device's relevant resource when a netcard detaches. However, a running routine may be unaware of this and cause the use-after-free of the mdev->addrs object, potentially leading to a denial of service.

CVSS metrics

5 scores · 4 sources · 2 versions

v4.05.7v3.14.7

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.33% 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.

Ubuntu73 products

linux< 5.15.0-78.85
linux-aws< 5.15.0-1040.45
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< 5.15.0-1040.45~20.04.1
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.8All versions (No fix recorded)
linux-azureAll versions (No fix recorded) | < 5.15.0-1042.49
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1042.49~20.04.1
linux-azure-5.19All versions (No fix recorded)
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde< 5.15.0-1042.49.1
linux-azure-fde-5.19All versions (No fix recorded)
linux-bluefield< 5.15.0-1021.23
linux-fipsAll versions (No fix recorded)
linux-gcpAll versions (No fix recorded) | < 5.15.0-1038.46
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1038.46~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.8All versions (No fix recorded)
linux-gke< 5.15.0-1038.43
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15< 5.15.0-1038.43~20.04.1
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.15.0-1024.29
linux-gkeop-5.15< 5.15.0-1024.29~20.04.1
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< 5.15.0-78.85~20.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.15.0-1034.37
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtime< 5.15.0-1035.37
linux-intel-iotg< 5.15.0-1036.41
linux-intel-iotg-5.15< 5.15.0-1036.41~20.04.1
linux-kvm< 5.15.0-1038.43
linux-lowlatency< 5.15.0-78.85
linux-lowlatency-hwe-5.15< 5.15.0-78.85~20.04.1
linux-nvidia< 5.15.0-1029.29
linux-nvidia-tegra< 5.15.0-1016.16
linux-nvidia-tegra-5.15< 5.15.0-1016.16~20.04.1
linux-nvidia-tegra-igx< 5.15.0-1002.2
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-5.17< 5.17.0-1011.12
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 5.15.0-1039.45
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< 5.15.0-1039.45~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.15.0-1034.37
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1042.47
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1037.41~20.04.2
linux-riscv-5.8All versions (No fix recorded)
linux-xilinx-zynqmp< 5.15.0-1025.29

Show all 73

Debian1 product

linux< 5.17.6-1

Linux1 product

linux_kernel≥ 5.15, ≤ 5.17 | 5.18:rc1 | 5.18:rc2 | 5.18:rc3 | 5.18:rc4

3 vendors · 75 products

References

11 links

bugzilla.redhat.com/show_bug.cgi?id=2217915Issue TrackingPatchThird Party Advisory
github.com/torvalds/linux/commit/b561275d633bcd8e0e8055ab86f1a13df75a0269REPORTPatch
www.openwall.com/lists/oss-security/2023/07/02/1Mailing ListPatchThird Party Advisory
ubuntu.com/security/CVE-2023-3439REPORT
git.kernel.org/linus/b561275d633bcd8e0e8055ab86f1a13df75a0269REPORT
www.openwall.com/lists/oss-security/2023/07/02/1REPORT
ubuntu.com/security/notices/USN-6246-1Advisory
ubuntu.com/security/notices/USN-6255-1Advisory
www.cve.org/CVERecord?id=CVE-2023-3439REPORT
security-tracker.debian.org/tracker/CVE-2023-3439Advisory

Show all 11 references

nvd.nist.gov/vuln/detail/CVE-2023-3439OvalAdvisory