CVE-2024-40909

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

12/07/2024

Last modified:

04/08/2026

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	6.6.26 (including)	6.6.35 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	6.9 (including)	6.9.6 (excluding)
cpe:2.3:o:linux:linux_kernel:6.10:rc1::::::
cpe:2.3:o:linux:linux_kernel:6.10:rc2::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2024-40909

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools