Vulnerability-Lookup

GHSA-XRPW-XX6G-3JG3

Vulnerability from github – Published: 2026-05-28 12:30 – Updated: 2026-05-28 12:30

Details

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

mptcp: pm: ADD_ADDR rtx: free sk if last

When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(), and released at the end.

If at that moment, it was the last reference being held, the sk would not be freed. sock_put() should then be called instead of __sock_put().

But that's not enough: if it is the last reference, sock_put() will call sk_free(), which will end up calling sk_stop_timer_sync() on the same timer, and waiting indefinitely to finish. So it is needed to mark that the timer is done at the end of the timer handler when it has not been rescheduled, not to call sk_stop_timer_sync() on "itself".

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{
  "affected": [],
  "aliases": [
    "CVE-2026-46170"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-28T10:16:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: ADD_ADDR rtx: free sk if last\n\nWhen an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(),\nand released at the end.\n\nIf at that moment, it was the last reference being held, the sk would\nnot be freed. sock_put() should then be called instead of __sock_put().\n\nBut that\u0027s not enough: if it is the last reference, sock_put() will call\nsk_free(), which will end up calling sk_stop_timer_sync() on the same\ntimer, and waiting indefinitely to finish. So it is needed to mark that\nthe timer is done at the end of the timer handler when it has not been\nrescheduled, not to call sk_stop_timer_sync() on \"itself\".",
  "id": "GHSA-xrpw-xx6g-3jg3",
  "modified": "2026-05-28T12:30:31Z",
  "published": "2026-05-28T12:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46170"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8143a224785ceaf2b0856e08d4498916f38228fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b74ad20198652b6b39a761c277ba65ae82b1e107"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7b9a461569734d33d3259d58d2507adfac107ed"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46170 (GCVE-0-2026-46170)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-05-28 09:36

Title

mptcp: pm: ADD_ADDR rtx: free sk if last

Summary

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: free sk if last When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(), and released at the end. If at that moment, it was the last reference being held, the sk would not be freed. sock_put() should then be called instead of __sock_put(). But that's not enough: if it is the last reference, sock_put() will call sk_free(), which will end up calling sk_stop_timer_sync() on the same timer, and waiting indefinitely to finish. So it is needed to mark that the timer is done at the end of the timer handler when it has not been rescheduled, not to call sk_stop_timer_sync() on "itself".

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/b74ad20198652b6b3…
https://git.kernel.org/stable/c/8143a224785ceaf2b…
https://git.kernel.org/stable/c/b7b9a461569734d33…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < b74ad20198652b6b39a761c277ba65ae82b1e107 (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 8143a224785ceaf2b0856e08d4498916f38228fb (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < b7b9a461569734d33d3259d58d2507adfac107ed (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1-rc3 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/pm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "b74ad20198652b6b39a761c277ba65ae82b1e107",
              "status": "affected",
              "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8",
              "versionType": "git"
            },
            {
              "lessThan": "8143a224785ceaf2b0856e08d4498916f38228fb",
              "status": "affected",
              "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8",
              "versionType": "git"
            },
            {
              "lessThan": "b7b9a461569734d33d3259d58d2507adfac107ed",
              "status": "affected",
              "version": "00cfd77b9063dcdf3628a7087faba60de85a9cc8",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/mptcp/pm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
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                  "versionStartIncluding": "5.10",
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                },
                {
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                  "versionEndExcluding": "7.1-rc3",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: pm: ADD_ADDR rtx: free sk if last\n\nWhen an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer(),\nand released at the end.\n\nIf at that moment, it was the last reference being held, the sk would\nnot be freed. sock_put() should then be called instead of __sock_put().\n\nBut that\u0027s not enough: if it is the last reference, sock_put() will call\nsk_free(), which will end up calling sk_stop_timer_sync() on the same\ntimer, and waiting indefinitely to finish. So it is needed to mark that\nthe timer is done at the end of the timer handler when it has not been\nrescheduled, not to call sk_stop_timer_sync() on \"itself\"."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-28T09:36:25.184Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/8143a224785ceaf2b0856e08d4498916f38228fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/b7b9a461569734d33d3259d58d2507adfac107ed"
        }
      ],
      "title": "mptcp: pm: ADD_ADDR rtx: free sk if last",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46170",
    "datePublished": "2026-05-28T09:36:25.184Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-05-28T09:36:25.184Z",
    "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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-XRPW-XX6G-3JG3

CVE-2026-46170 (GCVE-0-2026-46170)

Tags

Sightings

Nomenclature