Integer underflow in Linux kernel - CVE-2026-72382

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Main Vulnerability Database Vulnerabilities #VU143063

Integer underflow in Linux kernel - CVE-2026-72382

Published: August 16, 2026


Vulnerability identifier: #VU143063
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72382
CWE-ID: CWE-191
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an integer underflow in parse_dacl() in fs/smb/server/smbacl.c when processing a crafted security descriptor in SMB2_SET_INFO security information requests. A remote attacker can send a specially crafted request to cause a denial of service.

The issue can bypass the ACE count guard for undersized DACLs and trigger large temporary ACL state and pointer-array allocations.


Affected software

Linux kernel
Ubuntu
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

How to mitigate CVE-2026-72382

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1

External References

Related Security Bulletins