What is CVE-2022-49138?

CVE-2022-49138 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.7 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 2.6.27 onward and patched in 5.17.3 and 5.18. CVE-2022-49138 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2022-49138?

CVE-2022-49138 has a CVSS score of 5.7 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2022-49138?

Yes, CVE-2022-49138 has been patched. Fixed versions include 5.17.3 and 5.18. If you are running Linux kernel 2.6.27 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2022-49138 actively exploited?

CVE-2022-49138 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2022-49138

Medium

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: Ignore multiple conn complete events When one of the three connection complete events is received multiple times for the same handle, the device is registered multiple times which leads to memory corruptions. Therefore, consequent events for a single connection are ignored. The conn->state can hold different values, therefore HCI_CONN_HANDLE_UNSET is introduced to identify new connections. To make sure the events do not contain this or another invalid handle HCI_CONN_HANDLE_MAX and checks are introduced. Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=215497

Package Linux Kernel

Published 2025-02-26

Last modified 2025-09-23

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.7

out of 10

Medium

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-476

CVE-2022-49138 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 2.6.27 and later are affected. Fixed in 5.17.3, 5.18 and their respective stable series.

Affected from

≥ 2.6.27

Fixed in

✓ 5.17.3 5.17.x ✓ 5.18

References

The following references provide additional information about CVE-2022-49138 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/aa1ca580e3ffe62a2c5ea1c095b609b2943c5269
Patch
Kernel patch commit
https://git.kernel.org/stable/c/d5ebaa7c5f6f688959e8d40840b2249ede63b8ed
Patch

Details

CVE ID CVE-2022-49138

Severity Medium

CVSS score 5.7 / 10

CVSS version 3.1

Published 2025-02-26

Modified 2025-09-23

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2022-49138?

CVE-2022-49138 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.7 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 2.6.27 onward and has been patched in 5.17.3 and 5.18. CVE-2022-49138 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2022-49138?

CVE-2022-49138 has a CVSS score of 5.7 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2022-49138?

Yes — CVE-2022-49138 has been patched. Fixed versions include 5.17.3 and 5.18. If you are running Linux kernel 2.6.27 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2022-49138 actively exploited?

No — CVE-2022-49138 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. View CWE-476 on MITRE CWE →