Vulnerability-Lookup

GHSA-78RW-466C-3P7P

Vulnerability from github – Published: 2026-10-14 15:32 – Updated: 2026-10-14 15:32

Details

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

af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.

Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait in unix_stream_read_generic() if recv() is blocking and the last skb in the queue is MSG_OOB skb.

In such a situation, TCP returns 0 immediately regardless of blocking or non-blocking.

Let's follow the behaviour.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-98394"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-14T14:17:50Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.\n\nFahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait\nin unix_stream_read_generic() if recv() is blocking and the last\nskb in the queue is MSG_OOB skb.\n\nIn such a situation, TCP returns 0 immediately regardless of\nblocking or non-blocking.\n\nLet\u0027s follow the behaviour.",
  "id": "GHSA-78rw-466c-3p7p",
  "modified": "2026-10-14T15:32:19Z",
  "published": "2026-10-14T15:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98394"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6e5ee08eb5858d175da6768d75d163817b6a9d4a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c81c5be3826c8467945b964d0cf7f7b3d65461db"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5dd55b316ca229a4cbf11729483ba5bb57233e7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98394 (GCVE-0-2026-98394)

Vulnerability from cvelistv5 – Published: 2026-10-14 13:25 – Updated: 2026-10-19 09:18

Title

af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer. Fahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait in unix_stream_read_generic() if recv() is blocking and the last skb in the queue is MSG_OOB skb. In such a situation, TCP returns 0 immediately regardless of blocking or non-blocking. Let's follow the behaviour.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7056 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/3d3c7a3df66b2ca3d…
https://git.kernel.org/stable/c/d5dd55b316ca229a4…
https://git.kernel.org/stable/c/c81c5be3826c84679…
https://git.kernel.org/stable/c/6e5ee08eb5858d175…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 314001f0bf927015e459c9d387d62a231fe93af3 , < 3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713 (git) Affected: 314001f0bf927015e459c9d387d62a231fe93af3 , < d5dd55b316ca229a4cbf11729483ba5bb57233e7 (git) Affected: 314001f0bf927015e459c9d387d62a231fe93af3 , < c81c5be3826c8467945b964d0cf7f7b3d65461db (git) Affected: 314001f0bf927015e459c9d387d62a231fe93af3 , < 6e5ee08eb5858d175da6768d75d163817b6a9d4a (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.12.111 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713",
              "status": "affected",
              "version": "314001f0bf927015e459c9d387d62a231fe93af3",
              "versionType": "git"
            },
            {
              "lessThan": "d5dd55b316ca229a4cbf11729483ba5bb57233e7",
              "status": "affected",
              "version": "314001f0bf927015e459c9d387d62a231fe93af3",
              "versionType": "git"
            },
            {
              "lessThan": "c81c5be3826c8467945b964d0cf7f7b3d65461db",
              "status": "affected",
              "version": "314001f0bf927015e459c9d387d62a231fe93af3",
              "versionType": "git"
            },
            {
              "lessThan": "6e5ee08eb5858d175da6768d75d163817b6a9d4a",
              "status": "affected",
              "version": "314001f0bf927015e459c9d387d62a231fe93af3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.\n\nFahad Alharbi reported that recv(0, MSG_PEEK) triggers busy-wait\nin unix_stream_read_generic() if recv() is blocking and the last\nskb in the queue is MSG_OOB skb.\n\nIn such a situation, TCP returns 0 immediately regardless of\nblocking or non-blocking.\n\nLet\u0027s follow the behaviour."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:47.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3d3c7a3df66b2ca3d2cd1a2a0c37eb701feba713"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5dd55b316ca229a4cbf11729483ba5bb57233e7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c81c5be3826c8467945b964d0cf7f7b3d65461db"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e5ee08eb5858d175da6768d75d163817b6a9d4a"
        }
      ],
      "title": "af_unix: Return immediately when manage_oob() returns NULL for 0-length buffer.",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98394",
    "datePublished": "2026-10-14T13:25:57.287Z",
    "dateReserved": "2026-09-25T10:25:14.346Z",
    "dateUpdated": "2026-10-19T09:18:47.827Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted