Vulnerability-Lookup

FKIE_CVE-2026-31673

Vulnerability from fkie_nvd - Published: 2026-04-25 09:16 - Updated: 2026-06-17 10:34

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: read UNIX_DIAG_VFS data under unix_state_lock Exact UNIX diag lookups hold a reference to the socket, but not to u->path. Meanwhile, unix_release_sock() clears u->path under unix_state_lock() and drops the path reference after unlocking. Read the inode and device numbers for UNIX_DIAG_VFS while holding unix_state_lock(), then emit the netlink attribute after dropping the lock. This keeps the VFS data stable while the reply is being built.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0c739f3785f84af695952c2bac8be2f45082c9b8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/39897df386376912d561d4946499379effa1e7ef	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/900a4e0910e98b8caef117d5df00471fa438dcf9	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b9232421a77a649c9376c99fdfc8cb7f79cad34c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bdf206e740bf2919d818f132c8c9cc7ed91d11c0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c3ec44ab4526bbc4b6c9fc845af86488244f4c9b
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e7339db13b9ddb63417b12da55fd6191e59f7442

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: read UNIX_DIAG_VFS data under unix_state_lock\n\nExact UNIX diag lookups hold a reference to the socket, but not to\nu-\u003epath. Meanwhile, unix_release_sock() clears u-\u003epath under\nunix_state_lock() and drops the path reference after unlocking.\n\nRead the inode and device numbers for UNIX_DIAG_VFS while holding\nunix_state_lock(), then emit the netlink attribute after dropping the\nlock.\n\nThis keeps the VFS data stable while the reply is being built."
    }
  ],
  "id": "CVE-2026-31673",
  "lastModified": "2026-06-17T10:34:12.710",
  "metrics": {
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          "attackComplexity": "LOW",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "type": "Secondary"
      }
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  "published": "2026-04-25T09:16:00.423",
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  "vulnStatus": "Modified",
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          "value": "NVD-CWE-noinfo"
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      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}

CVE-2026-31673 (GCVE-0-2026-31673)

Vulnerability from cvelistv5 – Published: 2026-04-25 08:46 – Updated: 2026-08-05 12:24

Title

af_unix: read UNIX_DIAG_VFS data under unix_state_lock

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/e7339db13b9ddb634…
https://git.kernel.org/stable/c/4f6a8f10182c3a9d2…
https://git.kernel.org/stable/c/c3ec44ab4526bbc4b…
https://git.kernel.org/stable/c/b9232421a77a649c9…
https://git.kernel.org/stable/c/0c739f3785f84af69…
https://git.kernel.org/stable/c/900a4e0910e98b8ca…
https://git.kernel.org/stable/c/bdf206e740bf2919d…
https://git.kernel.org/stable/c/39897df386376912d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < e7339db13b9ddb63417b12da55fd6191e59f7442 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < c3ec44ab4526bbc4b6c9fc845af86488244f4c9b (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < b9232421a77a649c9376c99fdfc8cb7f79cad34c (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 0c739f3785f84af695952c2bac8be2f45082c9b8 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 900a4e0910e98b8caef117d5df00471fa438dcf9 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < bdf206e740bf2919d818f132c8c9cc7ed91d11c0 (git) Affected: 5f7b0569460b7d8d01ca776430a00505a68b7584 , < 39897df386376912d561d4946499379effa1e7ef (git)
Linux	Linux	Affected: 3.3 Unaffected: 0 , < 3.3 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/unix/diag.c"
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_unix: read UNIX_DIAG_VFS data under unix_state_lock\n\nExact UNIX diag lookups hold a reference to the socket, but not to\nu-\u003epath. Meanwhile, unix_release_sock() clears u-\u003epath under\nunix_state_lock() and drops the path reference after unlocking.\n\nRead the inode and device numbers for UNIX_DIAG_VFS while holding\nunix_state_lock(), then emit the netlink attribute after dropping the\nlock.\n\nThis keeps the VFS data stable while the reply is being built."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is reached through local NETLINK_SOCK_DIAG SOCK_DIAG_BY_FAMILY requests for AF_UNIX diagnostics. It is not reachable from remote network packets; an attacker needs local code execution to create sockets and send netlink requests.\nAC:L - The race is attacker-controlled because one thread can repeatedly issue exact UNIX_DIAG requests with UDIAG_SHOW_VFS while another closes attacker-created pathname AF_UNIX sockets. No rare external condition is required beyond timing that can be retried.\nPR:L - Unprivileged users can create AF_UNIX sockets and NETLINK_SOCK_DIAG sockets, and the sock_diag netlink socket permits non-root diagnostic requests. No real root or init-namespace CAP_NET_ADMIN is required.\nUI:N - Exploitation does not require any victim action. The attacker can create, bind, query, unlink, and close the involved sockets directly.\nS:U - The bug is in the kernel AF_UNIX diagnostic path and impacts kernel resources within the same security authority. It is a standard local kernel vulnerability, not a VM, IOMMU, or sandbox boundary-crossing issue.\nC:H - The bug is a use-after-free/read-after-free of the AF_UNIX VFS path dentry, allowing stale kernel object pointers to be dereferenced and returned or used during netlink reply construction. Under the required kernel scoring guidance, UAFs are treated as high confidentiality impact.\nI:H - Although the immediate vulnerable operation reads VFS fields, it is a kernel use-after-free in attacker-controllable local object lifetime and race conditions. Following the required guidance and higher-severity rule, UAFs are scored as potentially enabling integrity compromise.\nA:H - The stale dentry or related VFS pointer can be dereferenced after path_put(), plausibly causing a kernel oops or panic. Repeated local triggering makes high availability impact defensible."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:24:20.351Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e7339db13b9ddb63417b12da55fd6191e59f7442"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3ec44ab4526bbc4b6c9fc845af86488244f4c9b"
        },
        {
          "url": "https://git.kernel.org/stable/c/b9232421a77a649c9376c99fdfc8cb7f79cad34c"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c739f3785f84af695952c2bac8be2f45082c9b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/900a4e0910e98b8caef117d5df00471fa438dcf9"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdf206e740bf2919d818f132c8c9cc7ed91d11c0"
        },
        {
          "url": "https://git.kernel.org/stable/c/39897df386376912d561d4946499379effa1e7ef"
        }
      ],
      "title": "af_unix: read UNIX_DIAG_VFS data under unix_state_lock",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31673",
    "datePublished": "2026-04-25T08:46:49.246Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-08-05T12:24:20.351Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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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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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

FKIE_CVE-2026-31673

CVE-2026-31673 (GCVE-0-2026-31673)

Tags

Sightings

Nomenclature

Related by attack behaviour