Vulnerability-Lookup

GHSA-H5PH-X8J2-R7VG

Vulnerability from github – Published: 2024-10-21 12:30 – Updated: 2024-10-24 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf, lsm: Add check for BPF LSM return value

A bpf prog returning a positive number attached to file_alloc_security hook makes kernel panic.

This happens because file system can not filter out the positive number returned by the LSM prog using IS_ERR, and misinterprets this positive number as a file pointer.

Given that hook file_alloc_security never returned positive number before the introduction of BPF LSM, and other BPF LSM hooks may encounter similar issues, this patch adds LSM return value check in verifier, to ensure no unexpected value is returned.

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-2024-47703"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-10-21T12:15:06Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, lsm: Add check for BPF LSM return value\n\nA bpf prog returning a positive number attached to file_alloc_security\nhook makes kernel panic.\n\nThis happens because file system can not filter out the positive number\nreturned by the LSM prog using IS_ERR, and misinterprets this positive\nnumber as a file pointer.\n\nGiven that hook file_alloc_security never returned positive number\nbefore the introduction of BPF LSM, and other BPF LSM hooks may\nencounter similar issues, this patch adds LSM return value check\nin verifier, to ensure no unexpected value is returned.",
  "id": "GHSA-h5ph-x8j2-r7vg",
  "modified": "2024-10-24T15:31:08Z",
  "published": "2024-10-21T12:30:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-47703"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1050727d83e70449991c29dd1cf29fe936a63da3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27ca3e20fe80be85a92b10064dfeb56cb2564b1c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d99e198be279045e6ecefe220f5c52f8ce9bfd5"
    }
  ],
  "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-2024-47703 (GCVE-0-2024-47703)

Vulnerability from cvelistv5 – Published: 2024-10-21 11:53 – Updated: 2025-05-04 09:37

Title

bpf, lsm: Add check for BPF LSM return value

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf, lsm: Add check for BPF LSM return value A bpf prog returning a positive number attached to file_alloc_security hook makes kernel panic. This happens because file system can not filter out the positive number returned by the LSM prog using IS_ERR, and misinterprets this positive number as a file pointer. Given that hook file_alloc_security never returned positive number before the introduction of BPF LSM, and other BPF LSM hooks may encounter similar issues, this patch adds LSM return value check in verifier, to ensure no unexpected value is returned.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/1050727d83e704499…
	https://git.kernel.org/stable/c/27ca3e20fe80be85a…
	https://git.kernel.org/stable/c/5d99e198be279045e…

Impacted products

Vendor

Product

Version

Linux

Affected: 520b7aa00d8cd8e411ecc09f63a2acd90feb6d29 , < 1050727d83e70449991c29dd1cf29fe936a63da3 (git)
Affected: 520b7aa00d8cd8e411ecc09f63a2acd90feb6d29 , < 27ca3e20fe80be85a92b10064dfeb56cb2564b1c (git)
Affected: 520b7aa00d8cd8e411ecc09f63a2acd90feb6d29 , < 5d99e198be279045e6ecefe220f5c52f8ce9bfd5 (git)

Linux

Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 6.10.13 , ≤ 6.10.* (semver)
Unaffected: 6.11.2 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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                "id": "CVE-2024-47703",
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                  },
                  {
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                  }
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                "role": "CISA Coordinator",
                "timestamp": "2024-10-21T13:04:16.628163Z",
                "version": "2.0.3"
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        "providerMetadata": {
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            "kernel/bpf/verifier.c"
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    "datePublished": "2024-10-21T11:53:38.714Z",
    "dateReserved": "2024-09-30T16:00:12.945Z",
    "dateUpdated": "2025-05-04T09:37:51.227Z",
    "state": "PUBLISHED"
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}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-H5PH-X8J2-R7VG

CVE-2024-47703 (GCVE-0-2024-47703)

Tags

Sightings

Nomenclature