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GHSA-P59W-R597-MMWF

Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-05-07 15:31

Details

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.

Severity

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49873"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-704"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:12Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix wrong reg type conversion in release_reference()\n\nSome helper functions will allocate memory. To avoid memory leaks, the\nverifier requires the eBPF program to release these memories by calling\nthe corresponding helper functions.\n\nWhen a resource is released, all pointer registers corresponding to the\nresource should be invalidated. The verifier use release_references() to\ndo this job, by apply  __mark_reg_unknown() to each relevant register.\n\nIt will give these registers the type of SCALAR_VALUE. A register that\nwill contain a pointer value at runtime, but of type SCALAR_VALUE, which\nmay allow the unprivileged user to get a kernel pointer by storing this\nregister into a map.\n\nUsing __mark_reg_not_init() while NOT allow_ptr_leaks can mitigate this\nproblem.",
  "id": "GHSA-p59w-r597-mmwf",
  "modified": "2025-05-07T15:31:25Z",
  "published": "2025-05-01T15:31:50Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49873"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/466ce46f251dfb259a8cbaa895ab9edd6fb56240"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae5ccad6c711db0f2ca1231be051935dd128b8f5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cedd4f01f67be94735f15123158f485028571037"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1db20814af532f85e091231223e5e4818e8464b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49873 (GCVE-0-2022-49873)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:10 – Updated: 2026-05-11 19:08

Title

bpf: Fix wrong reg type conversion in release_reference()

Summary

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.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-10-01 16:03 UTC

CWE

CWE-704 - Incorrect Type Conversion or Cast

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/cedd4f01f67be9473…
https://git.kernel.org/stable/c/466ce46f251dfb259…
https://git.kernel.org/stable/c/ae5ccad6c711db0f2…
https://git.kernel.org/stable/c/f1db20814af532f85…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < cedd4f01f67be94735f15123158f485028571037 (git) Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < 466ce46f251dfb259a8cbaa895ab9edd6fb56240 (git) Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < ae5ccad6c711db0f2ca1231be051935dd128b8f5 (git) Affected: fd978bf7fd312581a7ca454a991f0ffb34c4204b , < f1db20814af532f85e091231223e5e4818e8464b (git)
Linux	Linux	Affected: 4.20 Unaffected: 0 , < 4.20 (semver) Unaffected: 5.10.155 , ≤ 5.10.* (semver) Unaffected: 5.15.79 , ≤ 5.15.* (semver) Unaffected: 6.0.9 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)

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JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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