CVE-2023-53813

Description

A flaw was identified in the ext4 filesystem’s block preallocation allocator in the Linux kernel. During allocation, the code traverses an rbtree of per-inode preallocations.Concurrently, the helper ext4_mb_discard_group_preallocation() can mark PAs as deleted, which may cause a naive rbtree traversal to skip eligible entries. In certain conditions, this inconsistent traversal can result in missing a preallocation that would satisfy the allocation request and instead creating a new preallocation that overlaps an existing one. This can lead to the kernel hitting a BUG_ON() or other integrity faults, potentially causing memory corruption or a system crash.

Mitigation

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Common Vulnerability Scoring System (CVSS) Score Details

Info alert:Important note

CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).

CVSS v3 Score Breakdown

Red HatNVDcve.org
Base Score6.4N/AN/A
Attack VectorNetworkN/AN/A
Attack ComplexityHighN/AN/A
Privileges RequiredLowN/AN/A
User InteractionNoneN/AN/A
ScopeUnchangedN/AN/A
ConfidentialityLowN/AN/A
Integrity ImpactLowN/AN/A
Availability ImpactHighN/AN/A

Vector

Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H

Understanding the Weakness (CWE)

CWE-821

Integrity,Confidentiality,Other

Technical Impact: Modify Application Data; Read Application Data; Alter Execution Logic

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