Vulnerability-Lookup

GHSA-4MP8-C9W5-FF64

Vulnerability from github – Published: 2025-07-03 09:30 – Updated: 2025-12-17 18:31

Details

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

net: Fix TOCTOU issue in sk_is_readable()

sk->sk_prot->sock_is_readable is a valid function pointer when sk resides in a sockmap. After the last sk_psock_put() (which usually happens when socket is removed from sockmap), sk->sk_prot gets restored and sk->sk_prot->sock_is_readable becomes NULL.

This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded after the initial check. Which in turn may lead to a null pointer dereference.

Ensure the function pointer does not turn NULL after the check.

Severity

4.7 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38112"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-367"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-03T09:15:24Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: Fix TOCTOU issue in sk_is_readable()\n\nsk-\u003esk_prot-\u003esock_is_readable is a valid function pointer when sk resides\nin a sockmap. After the last sk_psock_put() (which usually happens when\nsocket is removed from sockmap), sk-\u003esk_prot gets restored and\nsk-\u003esk_prot-\u003esock_is_readable becomes NULL.\n\nThis makes sk_is_readable() racy, if the value of sk-\u003esk_prot is reloaded\nafter the initial check. Which in turn may lead to a null pointer\ndereference.\n\nEnsure the function pointer does not turn NULL after the check.",
  "id": "GHSA-4mp8-c9w5-ff64",
  "modified": "2025-12-17T18:31:31Z",
  "published": "2025-07-03T09:30:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38112"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38112 (GCVE-0-2025-38112)

Vulnerability from cvelistv5 – Published: 2025-07-03 08:35 – Updated: 2026-05-11 21:21

Title

net: Fix TOCTOU issue in sk_is_readable()

Summary

In the Linux kernel, the following vulnerability has been resolved: net: Fix TOCTOU issue in sk_is_readable() sk->sk_prot->sock_is_readable is a valid function pointer when sk resides in a sockmap. After the last sk_psock_put() (which usually happens when socket is removed from sockmap), sk->sk_prot gets restored and sk->sk_prot->sock_is_readable becomes NULL. This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded after the initial check. Which in turn may lead to a null pointer dereference. Ensure the function pointer does not turn NULL after the check.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

9 references

URL	Tags
https://git.kernel.org/stable/c/c2b26638476baee15…
https://git.kernel.org/stable/c/6fa68d7eab34d448a…
https://git.kernel.org/stable/c/8926a7ef1977a832d…
https://git.kernel.org/stable/c/ff55c85a923e043d5…
https://git.kernel.org/stable/c/1e0de7582ceccbdbb…
https://git.kernel.org/stable/c/1b367ba2f94251822…
https://git.kernel.org/stable/c/2660a544fdc0940bb…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < c2b26638476baee154920bb587fc94ff1bf04336 (git) Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < 6fa68d7eab34d448a61aa24ea31e68b3231ed20d (git) Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < 8926a7ef1977a832dd6bf702f1a99303dbf15b15 (git) Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < ff55c85a923e043d59d26b20a673a1b4a219c310 (git) Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < 1e0de7582ceccbdbb227d4e0ddf65732f92526da (git) Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < 1b367ba2f94251822577daed031d6b9a9e11ba91 (git) Affected: 8934ce2fd08171e8605f7fada91ee7619fe17ab8 , < 2660a544fdc0940bba15f70508a46cf9a6491230 (git)
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.94 , ≤ 6.6.* (semver) Unaffected: 6.12.34 , ≤ 6.12.* (semver) Unaffected: 6.15.3 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix)

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JSON

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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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