What is CVE-2022-49889?

CVE-2022-49889 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 5.19.17 onward and patched in 5.20, 5.15.78 and 6.0.8. CVE-2022-49889 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2022-49889?

CVE-2022-49889 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2022-49889?

Yes, CVE-2022-49889 has been patched. Fixed versions include 5.20, 5.15.78 and 6.0.8. If you are running Linux kernel 5.19.17 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2022-49889 actively exploited?

CVE-2022-49889 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-2022-49889

Medium

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Check for NULL cpu_buffer in ring_buffer_wake_waiters() On some machines the number of listed CPUs may be bigger than the actual CPUs that exist. The tracing subsystem allocates a per_cpu directory with access to the per CPU ring buffer via a cpuX file. But to save space, the ring buffer will only allocate buffers for online CPUs, even though the CPU array will be as big as the nr_cpu_ids. With the addition of waking waiters on the ring buffer when closing the file, the ring_buffer_wake_waiters() now needs to make sure that the buffer is allocated (with the irq_work allocated with it) before trying to wake waiters, as it will cause a NULL pointer dereference. While debugging this, I added a NULL check for the buffer itself (which is OK to do), and also NULL pointer checks against buffer->buffers (which is not fine, and will WARN) as well as making sure the CPU number passed in is within the nr_cpu_ids (which is also not fine if it isn't). Bugzilla: https://bugzilla.opensuse.org/show_bug.cgi?id=1204705

Package Linux Kernel

Published 2025-05-01

Last modified 2025-10-01

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-476

CVE-2022-49889 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 5.19.17, 5.15.75, 6.0.3 and later are affected. Fixed in 5.20, 5.15.78, 6.0.8 and their respective stable series.

Affected from

≥ 5.19.17 ≥ 5.15.75 ≥ 6.0.3

Fixed in

✓ 5.20 5.20.x ✓ 5.15.78 5.15.x ✓ 6.0.8 6.0.x

References

3 total

Kernel Git
https://git.kernel.org/stable/c/49ca992f6e50d0f46ec9608f44e011cf3121f389

Patch
Kernel Git
https://git.kernel.org/stable/c/7433632c9ff68a991bd0bc38cabf354e9d2de410

Patch
Kernel Git
https://git.kernel.org/stable/c/b5074df412bf3df9d6ce096b6fa03eb1082d05c9

Patch

Details

CVE ID CVE-2022-49889

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2025-05-01

Modified 2025-10-01

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2022-49889?

CVE-2022-49889 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 5.19.17 onward and has been patched in 5.20, 5.15.78 and 6.0.8. CVE-2022-49889 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2022-49889?

CVE-2022-49889 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2022-49889?

Yes. CVE-2022-49889 has been patched. Fixed versions include 5.20, 5.15.78 and 6.0.8. If you are running Linux kernel 5.19.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2022-49889 actively exploited?

No. CVE-2022-49889 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.