PT-2026-43858 · Linux · Linux Kernel

CVE-2026-45991 · Published 2026-05-27 · Updated 2026-07-28

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A heap out-of-bounds write can occur in the part descs loc[] table when mounting a crafted UDF image containing repeated partition descriptors. The handle partition descriptor() function fails to record the partition number in appended slots, causing duplicate descriptors to be added and the num part descs counter to grow continuously. When the table reaches capacity, the allocation size is calculated based on the partition number rather than the append count. If the partition number is already aligned to PART DESC ALLOC STEP, the capacity may not increase, leading to a write operation beyond the table boundaries.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

CVE-2026-45991

ECHO-07EF-67A4-0329

OESA-2026-2674

OPENSUSE-SU-2026:10954-1

USN-8488-1

USN-8488-2

USN-8489-1

USN-8507-1

USN-8567-1

USN-8569-1

USN-8574-1

USN-8574-2

USN-8574-3

USN-8595-1

USN-8595-2

USN-8595-3

USN-8596-1

USN-8603-1

USN-8606-1

USN-8607-1

USN-8608-1

USN-8609-1

USN-8619-1

Affected Products

Linux Kernel

References · 2241

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45991.json · Exploit
• https://ubuntu.com/security/CVE-2026-64049 · Vendor Advisory
• https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a · Patch
• https://ubuntu.com/security/CVE-2026-31730 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-63910 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-63841 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43445 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-31720 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-64075 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45938 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-63860 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-45991 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-68736 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43227 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-23343 · Vendor Advisory