CVE-2026-45991

HIGH EPSS 6.0%
Published May 27, 20261mo ago · Modified Jun 19, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published May 27, 2026 1mo ago
Last Modified Jun 19, 2026 1w ago

Description

In the Linux kernel, the following vulnerability has been resolved: udf: fix partition descriptor append bookkeeping Mounting a crafted UDF image with repeated partition descriptors can trigger a heap out-of-bounds write in part_descs_loc[]. handle_partition_descriptor() deduplicates entries by partition number, but appended slots never record partnum. As a result duplicate Partition Descriptors are appended repeatedly and num_part_descs keeps growing. Once the table is full, the growth path still sizes the allocation from partnum even though inserts are indexed by num_part_descs. If partnum is already aligned to PART_DESC_ALLOC_STEP, ALIGN(partnum, step) can keep the old capacity and the next append writes past the end of the table. Store partnum in the appended slot and size growth from the next append count so deduplication and capacity tracking follow the same model.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
6.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥4.18.7  –  <4.19
linuxlinux_kernel*≥4.19.1  –  <6.6.140
linuxlinux_kernel*≥6.7  –  <6.12.88
linuxlinux_kernel*≥6.13  –  <7.0.4
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any
linuxlinux_kernel4.19any

References 7

  • git.kernel.org https://git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/68013a9bd4c01acd42073715f00e1a1992f089ee
  • git.kernel.org https://git.kernel.org/stable/c/ad3c0c4400686f6f37b382aaa48fac2b9aefccbe
  • git.kernel.org https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e8474cfbac9ada2cdaa4eaedec22aadfa0f58559

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/058b451b1039f056d1362c4fec2229e522366ab0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/08841b06fa64d8edbd1a21ca6e613420c90cc4b8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/08fa5d818e5bf53c7ca234d88ba334f32004e9b6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/b5597bb83fc37b5b5da74a4453fa920b932cf39a
    Patch