CVE-2022-49873

Medium

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix wrong reg type conversion in release_reference() Some helper functions will allocate memory. To avoid memory leaks, the verifier requires the eBPF program to release these memories by calling the corresponding helper functions. When a resource is released, all pointer registers corresponding to the resource should be invalidated. The verifier use release_references() to do this job, by apply __mark_reg_unknown() to each relevant register. It will give these registers the type of SCALAR_VALUE. A register that will contain a pointer value at runtime, but of type SCALAR_VALUE, which may allow the unprivileged user to get a kernel pointer by storing this register into a map. Using __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this problem.

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-704

CVE-2022-49873 is a Incorrect Type Conversion or Cast vulnerability

What is Incorrect Type Conversion or Cast?

The product does not correctly convert an object, resource, or structure from one type to another. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.20 and later are affected. Fixed in 5.10.155, 5.15.79, 6.0.9, 6.1 and their respective stable series.

Affected from
≥ 4.20
Fixed in
✓ 5.10.155 5.10.x ✓ 5.15.79 5.15.x ✓ 6.0.9 6.0.x ✓ 6.1

References

The following references provide additional information about CVE-2022-49873 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

4 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2022-49873?

    CVE-2022-49873 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Incorrect Type Conversion or Cast flaw (CWE-704) . It affects Linux kernel versions from 4.20 onward and has been patched in 5.10.155, 5.15.79, 6.0.9 and others. CVE-2022-49873 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2022-49873?

    CVE-2022-49873 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-2022-49873?

    Yes — CVE-2022-49873 has been patched. Fixed versions include 5.10.155, 5.15.79, 6.0.9 and others. If you are running Linux kernel 4.20 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2022-49873 actively exploited?

    No — CVE-2022-49873 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

  • What is Incorrect Type Conversion or Cast (CWE-704)?

    The product does not correctly convert an object, resource, or structure from one type to another. View CWE-704 on MITRE CWE →

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