Vulnerability-Lookup

GHSA-HQWG-H56W-34XH

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-14 00:31

Details

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

tcp: fix TIME_WAIT socket reference leak on PSP policy failure

Release the TIME_WAIT socket reference and jump to discard_it upon PSP policy failure in both IPv4 and IPv6 receive paths. This prevents a memory leak of tcp_tw_bucket structures.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68379"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:30Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TIME_WAIT socket reference leak on PSP policy failure\n\nRelease the TIME_WAIT socket reference and jump to discard_it\nupon PSP policy failure in both IPv4 and IPv6 receive paths.\nThis prevents a memory leak of tcp_tw_bucket structures.",
  "id": "GHSA-hqwg-h56w-34xh",
  "modified": "2026-08-14T00:31:56Z",
  "published": "2026-08-10T15:33:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68379"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c1931a81122c3cdc4c89448fe0442c69e21c0d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/374742a961becbbfc7fbfd1382d978a05e492741"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e666af5dcc905ba694745963174d232deb478c55"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-68379 (GCVE-0-2026-68379)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-17 05:04

Title

tcp: fix TIME_WAIT socket reference leak on PSP policy failure

Summary

In the Linux kernel, the following vulnerability has been resolved: tcp: fix TIME_WAIT socket reference leak on PSP policy failure Release the TIME_WAIT socket reference and jump to discard_it upon PSP policy failure in both IPv4 and IPv6 receive paths. This prevents a memory leak of tcp_tw_bucket structures.

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/e666af5dcc905ba69…
https://git.kernel.org/stable/c/374742a961becbbfc…
https://git.kernel.org/stable/c/2c1931a81122c3cdc…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 659a2899a57da59f433182eba571881884d6323e , < e666af5dcc905ba694745963174d232deb478c55 (git) Affected: 659a2899a57da59f433182eba571881884d6323e , < 374742a961becbbfc7fbfd1382d978a05e492741 (git) Affected: 659a2899a57da59f433182eba571881884d6323e , < 2c1931a81122c3cdc4c89448fe0442c69e21c0d5 (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ipv4.c",
            "net/ipv6/tcp_ipv6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e666af5dcc905ba694745963174d232deb478c55",
              "status": "affected",
              "version": "659a2899a57da59f433182eba571881884d6323e",
              "versionType": "git"
            },
            {
              "lessThan": "374742a961becbbfc7fbfd1382d978a05e492741",
              "status": "affected",
              "version": "659a2899a57da59f433182eba571881884d6323e",
              "versionType": "git"
            },
            {
              "lessThan": "2c1931a81122c3cdc4c89448fe0442c69e21c0d5",
              "status": "affected",
              "version": "659a2899a57da59f433182eba571881884d6323e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ipv4.c",
            "net/ipv6/tcp_ipv6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix TIME_WAIT socket reference leak on PSP policy failure\n\nRelease the TIME_WAIT socket reference and jump to discard_it\nupon PSP policy failure in both IPv4 and IPv6 receive paths.\nThis prevents a memory leak of tcp_tw_bucket structures."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The leak is triggered entirely by a received TCP segment processed in tcp_v4_rcv()/tcp_v6_rcv() do_time_wait path; a remote peer sending a crafted SYN to a socket in TIME_WAIT reaches the faulty code with no local access.\nAC:L - The attacker fully controls the trigger: send a plain non-PSP-encapsulated SYN with a sequence number above tw_rcv_nxt on the known 4-tuple of a just-closed PSP connection, which deterministically yields TCP_TW_SYN plus a PSP policy failure and leaks the reference every time.\nPR:N - No authentication or privileges are needed; the packet is handled in the TCP input path before any socket-level authorization, and the sender need only be the remote endpoint of a previously established connection.\nUI:N - Processing happens in softirq context on packet receive with no involvement from any local user or administrator.\nS:U - The leaked tcp_timewait_sock and psp_assoc objects are kernel memory managed by the same security authority as the vulnerable TCP receive path; no privilege or virtualization boundary is crossed.\nC:N - The missing inet_twsk_put() only omits a refcount decrement; no memory is read out of bounds, no freed object is accessed, and no data is returned to the attacker.\nI:N - No kernel data is modified or corrupted; the refcount simply never reaches zero, and refcount_t saturates rather than wrapping, so no use-after-free or write primitive arises.\nA:H - Each triggering packet permanently leaks a tcp_timewait_sock slab object plus its pinned psp_assoc, never reclaimed for the life of the boot; an unauthenticated peer can repeat this across arbitrarily many connections to exhaust kernel memory and drive the system to OOM."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:04:25.324Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e666af5dcc905ba694745963174d232deb478c55"
        },
        {
          "url": "https://git.kernel.org/stable/c/374742a961becbbfc7fbfd1382d978a05e492741"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c1931a81122c3cdc4c89448fe0442c69e21c0d5"
        }
      ],
      "title": "tcp: fix TIME_WAIT socket reference leak on PSP policy failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68379",
    "datePublished": "2026-08-10T12:03:57.537Z",
    "dateReserved": "2026-07-30T09:28:09.387Z",
    "dateUpdated": "2026-08-17T05:04:25.324Z",
    "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.

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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GHSA-HQWG-H56W-34XH

CVE-2026-68379 (GCVE-0-2026-68379)

Tags

Sightings

Nomenclature