Vulnerability-Lookup

GHSA-X2MR-3X78-F97G

Vulnerability from github – Published: 2026-02-14 18:30 – Updated: 2026-03-19 18:31

Details

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

dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero

The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL.

Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic.

Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.

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-2026-23206"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-14T17:15:58Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero\n\nThe driver allocates arrays for ports, FDBs, and filter blocks using\nkcalloc() with ethsw-\u003esw_attr.num_ifs as the element count. When the\ndevice reports zero interfaces (either due to hardware configuration\nor firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10)\ninstead of NULL.\n\nLater in dpaa2_switch_probe(), the NAPI initialization unconditionally\naccesses ethsw-\u003eports[0]-\u003enetdev, which attempts to dereference\nZERO_SIZE_PTR (address 0x10), resulting in a kernel panic.\n\nAdd a check to ensure num_ifs is greater than zero after retrieving\ndevice attributes. This prevents the zero-sized allocations and\nsubsequent invalid pointer dereference.",
  "id": "GHSA-x2mr-3x78-f97g",
  "modified": "2026-03-19T18:31:14Z",
  "published": "2026-02-14T18:30:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23206"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/155eb99aff2920153bf21217ae29565fff81e6af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fcccca88456b592bd668db13aa1d29ed257ca2b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4acc40db06ffd0fd92683505342b00c8a7394c60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80165ff16051448d6f840585ebe13f2400415df3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b97415c4362f739e25ec6f71012277086fabdf6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ed48a84a72fefb20a82dd90a7caa7807e90c6f66"
    }
  ],
  "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-2026-23206 (GCVE-0-2026-23206)

Vulnerability from cvelistv5 – Published: 2026-02-14 16:27 – Updated: 2026-05-11 22:02

Title

dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero

Summary

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/2fcccca88456b592b…
https://git.kernel.org/stable/c/80165ff16051448d6…
https://git.kernel.org/stable/c/b97415c4362f739e2…
https://git.kernel.org/stable/c/4acc40db06ffd0fd9…
https://git.kernel.org/stable/c/155eb99aff2920153…
https://git.kernel.org/stable/c/ed48a84a72fefb20a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 2fcccca88456b592bd668db13aa1d29ed257ca2b (git) Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 80165ff16051448d6f840585ebe13f2400415df3 (git) Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < b97415c4362f739e25ec6f71012277086fabdf6f (git) Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 4acc40db06ffd0fd92683505342b00c8a7394c60 (git) Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < 155eb99aff2920153bf21217ae29565fff81e6af (git) Affected: 0b1b71370458860579831e77485883fcf2e8fbbe , < ed48a84a72fefb20a82dd90a7caa7807e90c6f66 (git)
Linux	Linux	Affected: 5.13 Unaffected: 0 , < 5.13 (semver) Unaffected: 5.15.200 , ≤ 5.15.* (semver) Unaffected: 6.1.163 , ≤ 6.1.* (semver) Unaffected: 6.6.124 , ≤ 6.6.* (semver) Unaffected: 6.12.70 , ≤ 6.12.* (semver) Unaffected: 6.18.10 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix)

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JSON

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{
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          "programFiles": [
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              "version": "5.15.200",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.163",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.124",
              "versionType": "semver"
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            {
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              "status": "unaffected",
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            },
            {
              "lessThanOrEqual": "6.18.*",
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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