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

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-17 05:04
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 659a2899a57da59f433182eba571881884d6323e , < e666af5dcc905ba694745963174d232deb478c55 (git)
Affected: 659a2899a57da59f433182eba571881884d6323e , < 374742a961becbbfc7fbfd1382d978a05e492741 (git)
Affected: 659a2899a57da59f433182eba571881884d6323e , < 2c1931a81122c3cdc4c89448fe0442c69e21c0d5 (git)
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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": {
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        {
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          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_ipv4.c",
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        }
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      "metrics": [
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            "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"
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          "scenarios": [
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              "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."
            }
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        "dateUpdated": "2026-08-17T05:04:25.324Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/374742a961becbbfc7fbfd1382d978a05e492741"
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        {
          "url": "https://git.kernel.org/stable/c/2c1931a81122c3cdc4c89448fe0442c69e21c0d5"
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    "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"
  },
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      "date": "2026-09-20",
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            "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."
          }
        ],
        "id": "CVE-2026-68379",
        "lastModified": "2026-08-17T06:17:46.353",
        "metrics": {
          "cvssMetricV31": [
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                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
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        "vulnStatus": "Received"
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      "product_status:known_affected": "90",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tcp: fix TIME_WAIT socket reference leak on PSP policy failure",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68379.json",
      "version": "3"
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      "current_release_date": "2026-08-13T01:28:10Z",
      "cve": "CVE-2026-68379",
      "id": "CVE-2026-68379",
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      "product_status:known_not_affected": "296",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68379",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68379.json",
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    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.


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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.