CVE-2026-47331: Use-after-free in Ubuntu Linux AppArmor notification handling

Analyzed

AliasesUBUNTU-CVE-2026-47331

Published 28-05-2026Last modified 29-05-2026

Vulnerability summary

CVE-2026-47331 is a high (CVSS 7.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 0.11% chance of exploitation in the next 30 days, higher than 1.4% 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

0.11%

0%100%

Low · -0.05 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 5 · Related 5

USN-8373-1 USN-8393-1 USN-8440-1 USN-8497-1 USN-8499-1

Timeline

28-05-2026
PublishedVulnerability first disclosed.
29-05-2026
Last modifiedVulnerability information updated.

Description

Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An unprivileged local user could trigger the race condition that can lead to a use-after-free (UAF) and, theoretically, arbitrary code execution.

CVSS metrics

3 scores · 3 sources · 1 version

v3.17.8

EPSS trend

Probability

0.11%

Chance of exploitation in the next 30 days

Percentile

Versus all other CVEs

30-day change

Decrease -0.05 pp

From 0.17% 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.

Ubuntu118 products

linux< 6.8.0-124.124
linux-allwinner-5.19All versions (No fix recorded)
linux-aws< 6.8.0-1057.60
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-5.19All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.8All versions (No fix recorded)
linux-aws-6.14All versions (No fix recorded)
linux-aws-6.2All versions (No fix recorded)
linux-aws-6.5All versions (No fix recorded)
linux-aws-6.8< 6.8.0-1057.60~22.04.1
linux-aws-fips< 6.8.0-1057.60+fips1
linux-azureAll versions (No fix recorded) | < 6.8.0-1058.64
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
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-6.11All versions (No fix recorded)
linux-azure-6.2All versions (No fix recorded)
linux-azure-6.5All versions (No fix recorded)
linux-azure-6.8< 6.8.0-1059.65~22.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fdeAll versions (No fix recorded) | < 6.8.0-1058.65
linux-azure-fde-5.19All versions (No fix recorded)
linux-azure-fde-6.2All versions (No fix recorded)
linux-azure-fde-6.8< 6.8.0-1058.65~22.04.1
linux-azure-fips< 6.8.0-1059.65+fips1
linux-azure-nvidiaAll versions (No fix recorded)
linux-bluefield< 6.8.0-1023.27
linux-fips< 6.8.0-124.124+fips1
linux-gcpAll versions (No fix recorded) | < 6.8.0-1060.63
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.19All versions (No fix recorded)
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-6.11All versions (No fix recorded)
linux-gcp-6.14All versions (No fix recorded)
linux-gcp-6.2All versions (No fix recorded)
linux-gcp-6.5All versions (No fix recorded)
linux-gcp-6.8< 6.8.0-1060.63~22.04.1
linux-gcp-fips< 6.8.0-1060.63+fips1
linux-gkeAll versions (No fix recorded) | < 6.8.0-1055.61
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-gkeopAll versions (No fix recorded) | < 6.8.0-1042.45
linux-gkeop-5.15All versions (No fix recorded)
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-5.19All versions (No fix recorded)
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-6.11All versions (No fix recorded)
linux-hwe-6.14All versions (No fix recorded)
linux-hwe-6.2All versions (No fix recorded)
linux-hwe-6.5All versions (No fix recorded)
linux-hwe-6.8< 6.8.0-124.124~22.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 6.8.0-1057.58
linux-ibm-6.8< 6.8.0-1057.58~22.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-lowlatency< 6.8.0-134.134.1
linux-lowlatency-hwe-5.19All versions (No fix recorded)
linux-lowlatency-hwe-6.11All versions (No fix recorded)
linux-lowlatency-hwe-6.2All versions (No fix recorded)
linux-lowlatency-hwe-6.5All versions (No fix recorded)
linux-lowlatency-hwe-6.8< 6.8.0-134.134.1~22.04.1
linux-nvidia< 6.8.0-1055.58
linux-nvidia-6.11All versions (No fix recorded)
linux-nvidia-6.2All versions (No fix recorded)
linux-nvidia-6.5All versions (No fix recorded)
linux-nvidia-6.8< 6.8.0-1055.58~22.04.1
linux-nvidia-lowlatency< 6.8.0-1055.58.1
linux-nvidia-tegra< 6.8.0-1026.26
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-6.1All versions (No fix recorded)
linux-oem-6.11All versions (No fix recorded)
linux-oem-6.14All versions (No fix recorded)
linux-oem-6.5All versions (No fix recorded)
linux-oem-6.8All versions (No fix recorded)
linux-oracle< 6.8.0-1054.55
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-5.3All versions (No fix recorded)
linux-oracle-5.8All versions (No fix recorded)
linux-oracle-6.14All versions (No fix recorded)
linux-oracle-6.5All versions (No fix recorded)
linux-oracle-6.8< 6.8.0-1054.55~22.04.1
linux-raspi< 6.8.0-1057.61
linux-raspi-realtimeAll versions (No fix recorded) | < 6.8.0-2046.47
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 6.8.1-1052.53
linux-realtime-6.14All versions (No fix recorded)
linux-realtime-6.8< 6.8.1-1052.53~22.04.1
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.19All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-riscv-6.14All versions (No fix recorded)
linux-riscv-6.5All versions (No fix recorded)
linux-riscv-6.8< 6.8.0-124.124~22.04.1
linux-starfive-5.19All versions (No fix recorded)
linux-starfive-6.2All versions (No fix recorded)
linux-starfive-6.5All versions (No fix recorded)
linux-xilinx< 6.8.0-1032.33

Show all 118

Canonical1 product

ubuntu_linuxEOL≥ 6.8.0, < 6.8.0-124.124 | 24.04 | 25.10 | 26.04

2 vendors · 119 products

References

8 links

git.launchpad.net/~ubuntu-kernel/…Patch
ubuntu.com/security/CVE-2026-47331REPORT
www.cve.org/CVERecord?id=CVE-2026-47331REPORT
ubuntu.com/security/notices/USN-8373-1Advisory
ubuntu.com/security/notices/USN-8393-1Advisory
ubuntu.com/security/notices/USN-8440-1Advisory
ubuntu.com/security/notices/USN-8497-1Advisory
ubuntu.com/security/notices/USN-8499-1Advisory