Integer overflow in Linux kernel - CVE-2026-31704

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Main Vulnerability Database Vulnerabilities #VU128989

Integer overflow in Linux kernel - CVE-2026-31704

Published: May 2, 2026


Vulnerability identifier: #VU128989
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-31704
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause memory corruption.

The vulnerability exists due to an integer overflow in set_posix_acl_entries_dacl() and set_ntacl_dacl() when processing files with many POSIX ACL entries. A local user can create a file with many POSIX ACL entries to cause memory corruption.

The accumulated DACL size can wrap past 65535, causing subsequent writes to overwrite earlier ACE entries and resulting in a truncated DACL size value.


Affected software

Linux kernel
openEuler
Ubuntu
bpftool
kernel
python3-perf-debuginfo
python3-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-source
kernel-headers
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
kernel-tools
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-hwe-6.8 (Ubuntu package)
linux-ibm (Ubuntu package)
linux-oracle-6.8 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-aws-6.8 (Ubuntu package)
linux-aws (Ubuntu package)
linux-azure-fde (Ubuntu package)
linux-azure-fde-6.8 (Ubuntu package)
linux-azure (Ubuntu package)
linux-azure-fips (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2026-31704

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
bpftool - update to 5.10.0-315.0.0.218
kernel - update to 5.10.0-315.0.0.218
python3-perf-debuginfo - update to 5.10.0-315.0.0.218
python3-perf - update to 5.10.0-315.0.0.218
perf-debuginfo - update to 5.10.0-315.0.0.218
perf - update to 5.10.0-315.0.0.218
kernel-tools-devel - update to 5.10.0-315.0.0.218
kernel-tools-debuginfo - update to 5.10.0-315.0.0.218
kernel-source - update to 5.10.0-315.0.0.218
kernel-headers - update to 5.10.0-315.0.0.218
kernel-devel - update to 5.10.0-315.0.0.218
kernel-debugsource - update to 5.10.0-315.0.0.218
kernel-debuginfo - update to 5.10.0-315.0.0.218
bpftool-debuginfo - update to 5.10.0-315.0.0.218
kernel-tools - update to 5.10.0-315.0.0.218
linux (Ubuntu package) - addressed in versions 6.8.0-136.136, 6.8.0-1046.50, 6.8.0-1059.67, 6.8.0-1064.72, 6.8.0-1064.72~22.04.1, 6.8.1-1056.57, 6.8.1-1056.57~22.04.2, 7.0.0-27.27
linux-fips (Ubuntu package) - addressed in versions 6.8.0-136.136+fips2, 6.8.0-136.136.2, 6.8.0-136.136.2~22.04.1, 6.8.0-1058.61
linux-hwe-6.8 (Ubuntu package) - update to 6.8.0-136.136~22.04.1
linux-ibm (Ubuntu package) - addressed in versions 6.8.0-1030.31, 6.8.0-1033.34, 6.8.0-1061.62, 6.8.0-1061.62~22.04.1
linux-oracle-6.8 (Ubuntu package) - update to 6.8.0-1058.61~22.04.1
linux-nvidia (Ubuntu package) - addressed in versions 6.8.0-1059.62, 6.8.0-1059.62.1, 6.8.0-1059.62~22.04.1, 7.0.0-1013.13
linux-aws-6.8 (Ubuntu package) - addressed in versions 6.8.0-1061.64+fips1, 6.8.0-1061.64~22.04.1
linux-aws (Ubuntu package) - update to 6.8.0-1061.64+1
linux-azure-fde (Ubuntu package) - update to 6.8.0-1062.69
linux-azure-fde-6.8 (Ubuntu package) - update to 6.8.0-1062.69~22.04.1
linux-azure (Ubuntu package) - addressed in versions 6.8.0-1063.71, 6.8.0-1063.71~22.04.1, 7.0.0-1009.9, 7.0.0-1010.10
linux-azure-fips (Ubuntu package) - update to 6.8.0-1063.71+fips2
linux-gcp-fips (Ubuntu package) - update to 6.8.0-1064.72+fips1
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

External References

Related Security Bulletins