Vulnerability-Lookup

GHSA-V77C-JW3G-56GH

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

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

net: phylink: correctly validate returned PCS in phylink_inband_caps

In phylink_inband_caps(), the PCS returned by mac_select_pcs is only checked if NULL but mac_select_pcs can also return an error pointer.

This can cause a kernel panic as phylink_pcs_inband_caps() only checks if passed PCS is not NULL and directly dereference ops from the phylink_pcs struct.

Use the IS_ERR_OR_NULL macro to address both case where the returned PCS can be NULL or an error pointer and prevent a kernel panic.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80993"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:06Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phylink: correctly validate returned PCS in phylink_inband_caps\n\nIn phylink_inband_caps(), the PCS returned by mac_select_pcs is only\nchecked if NULL but mac_select_pcs can also return an error pointer.\n\nThis can cause a kernel panic as phylink_pcs_inband_caps() only checks\nif passed PCS is not NULL and directly dereference ops from the phylink_pcs\nstruct.\n\nUse the IS_ERR_OR_NULL macro to address both case where the returned\nPCS can be NULL or an error pointer and prevent a kernel panic.",
  "id": "GHSA-v77c-jw3g-56gh",
  "modified": "2026-09-11T21:31:23Z",
  "published": "2026-09-11T21:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80993"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6b533f83461c3730875cf3ed5ff6362dcb67be9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb4d77553841ae85bed9b2cf03351c401e871d85"
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  "schema_version": "1.4.0",
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}

CVE-2026-80993 (GCVE-0-2026-80993)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-11 19:42

Title

net: phylink: correctly validate returned PCS in phylink_inband_caps

Summary

In the Linux kernel, the following vulnerability has been resolved: net: phylink: correctly validate returned PCS in phylink_inband_caps In phylink_inband_caps(), the PCS returned by mac_select_pcs is only checked if NULL but mac_select_pcs can also return an error pointer. This can cause a kernel panic as phylink_pcs_inband_caps() only checks if passed PCS is not NULL and directly dereference ops from the phylink_pcs struct. Use the IS_ERR_OR_NULL macro to address both case where the returned PCS can be NULL or an error pointer and prevent a kernel panic.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b6b533f83461c3730…
https://git.kernel.org/stable/c/fb4d77553841ae85b…
https://git.kernel.org/stable/c/f2849b1fd059ec9b3…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: df874f9e52c340cc6f0a0014a97b778f67d46849 , < b6b533f83461c3730875cf3ed5ff6362dcb67be9 (git) Affected: df874f9e52c340cc6f0a0014a97b778f67d46849 , < fb4d77553841ae85bed9b2cf03351c401e871d85 (git) Affected: df874f9e52c340cc6f0a0014a97b778f67d46849 , < f2849b1fd059ec9b3281b771e6ac5aad9feee851 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/phy/phylink.c"
          ],
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              "status": "affected",
              "version": "df874f9e52c340cc6f0a0014a97b778f67d46849",
              "versionType": "git"
            }
          ]
        },
        {
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          "programFiles": [
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          ],
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          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
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              "version": "0",
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              "version": "7.2.4",
              "versionType": "semver"
            },
            {
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              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: phylink: correctly validate returned PCS in phylink_inband_caps\n\nIn phylink_inband_caps(), the PCS returned by mac_select_pcs is only\nchecked if NULL but mac_select_pcs can also return an error pointer.\n\nThis can cause a kernel panic as phylink_pcs_inband_caps() only checks\nif passed PCS is not NULL and directly dereference ops from the phylink_pcs\nstruct.\n\nUse the IS_ERR_OR_NULL macro to address both case where the returned\nPCS can be NULL or an error pointer and prevent a kernel panic."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:42:49.521Z",
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        {
          "url": "https://git.kernel.org/stable/c/f2849b1fd059ec9b3281b771e6ac5aad9feee851"
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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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