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CVE-2024-49870

kernel: cachefiles: fix dentry leak in cachefiles_open_file()

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Severity

Moderate

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · October 21, 2024

Updated · October 29, 2026

Description

A flaw was found in the Linux kernel's cachefiles component. A local attacker could exploit a dentry (directory entry) leak caused by a concurrency issue between a lookup cookie and a cull operation. This flaw prevents the proper release of a reference count, which can lead to resource exhaustion and a denial of service when the affected filesystem is unmounted.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

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

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L

CWE-401 · Missing Release of Memory after Effective Lifetime