What is CVE-2024-40909?

CVE-2024-40909 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 6.6.26 onward and patched in 6.6.35, 6.9.6 and 6.10. CVE-2024-40909 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2024-40909?

CVE-2024-40909 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2024-40909?

Yes, CVE-2024-40909 has been patched. Fixed versions include 6.6.35, 6.9.6 and 6.10. If you are running Linux kernel 6.6.26 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2024-40909 actively exploited?

CVE-2024-40909 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2024-40909

High

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.

Package Linux Kernel

Published 2024-07-12

Last modified 2024-11-21

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2024-40909 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.6.26, 6.8.5, 6.9 and later are affected. Fixed in 6.6.35, 6.9.6, 6.10 and their respective stable series.

Affected from

≥ 6.6.26 ≥ 6.8.5 ≥ 6.9

Fixed in

✓ 6.6.35 6.6.x ✓ 6.9.6 6.9.x ✓ 6.10

References

3 total

Kernel Git
https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a

Patch
Kernel Git
https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209

Patch
Kernel Git
https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382

Patch

Details

CVE ID CVE-2024-40909

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-07-12

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2024-40909?

CVE-2024-40909 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 6.6.26 onward and has been patched in 6.6.35, 6.9.6 and 6.10. CVE-2024-40909 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2024-40909?

CVE-2024-40909 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2024-40909?

Yes. CVE-2024-40909 has been patched. Fixed versions include 6.6.35, 6.9.6 and 6.10. If you are running Linux kernel 6.6.26 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2024-40909 actively exploited?

No. CVE-2024-40909 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.