CVE-2026-74428 (GCVE-0-2026-74428)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:47
VLAI
Title
rxrpc: Fix double unlock in rxrpc_recvmsg()
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix double unlock in rxrpc_recvmsg() Fix a double unlock in rxrpc_recvmsg() when dealing with OOB messages.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < 8cd8cf3052fff9a4b86b25734f610e4af03786d3 (git)
Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < 1297ae6aeebc3863cb437e42a1bc4cd6173e43d9 (git)
Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < a2f299b4d5510147fa8629a6aba2869bbcc88aea (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/recvmsg.c"
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix double unlock in rxrpc_recvmsg()\n\nFix a double unlock in rxrpc_recvmsg() when dealing with OOB messages."
        }
      ],
      "metrics": [
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - RxRPC processes CHALLENGE packets from remote UDP peers; with RXRPC_MANAGE_RESPONSE and RxGK security, a network peer can queue OOB challenges that are consumed on the next recvmsg() during normal client authentication (e.g., AFS/YFS).\nAC:L - An attacker who is the RxRPC peer (or a local user running a malicious server) can reliably deliver a CHALLENGE and trigger recvmsg() on demand; no rare timing, layout, or victim state outside attacker control is required.\nPR:N - No administrative capability is needed on the victim; any remote peer in an RxRPC connection can send CHALLENGE packets, and unprivileged local users can create AF_RXRPC sockets, set MANAGE_RESPONSE, and call recvmsg() without special privileges.\nUI:N - Exploitation does not require victim interaction beyond normal automated RxRPC/AFS client operation; recvmsg() is invoked automatically when OOB challenges are queued during connection security negotiation.\nS:U - Impact is confined to kernel memory and locking on the affected host; it does not cross VM, container, or IOMMU security boundaries into a separate authority.\nC:H - Double release_sock() corrupts socket lock ownership, allowing concurrent unsynchronized access to socket/call state and adjacent kernel heap objects, which can be leveraged for arbitrary kernel memory disclosure.\nI:H - The corrupted socket lock permits overlapping recvmsg()/sendmsg() access to connection and skb state, enabling heap corruption and control-flow hijack primitives typical of kernel locking bugs.\nA:H - The double unlock triggers lockdep warnings and can panic/oops the kernel or hang socket I/O when concurrent threads access the same RxRPC socket after ownership is incorrectly cleared."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:47:03.327Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/8cd8cf3052fff9a4b86b25734f610e4af03786d3"
        },
        {
          "url": "https://git.kernel.org/stable/c/1297ae6aeebc3863cb437e42a1bc4cd6173e43d9"
        },
        {
          "url": "https://git.kernel.org/stable/c/a2f299b4d5510147fa8629a6aba2869bbcc88aea"
        }
      ],
      "title": "rxrpc: Fix double unlock in rxrpc_recvmsg()",
      "x_generator": {
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74428",
    "datePublished": "2026-08-15T05:59:29.668Z",
    "dateReserved": "2026-08-15T05:44:03.895Z",
    "dateUpdated": "2026-08-17T05:47:03.327Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-21",
      "epss": "0.00347",
      "percentile": "0.28283"
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    "nvd": {
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                  }
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          }
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        "cveTags": [],
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          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix double unlock in rxrpc_recvmsg()\n\nFix a double unlock in rxrpc_recvmsg() when dealing with OOB messages."
          }
        ],
        "id": "CVE-2026-74428",
        "lastModified": "2026-08-17T06:19:38.380",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "references": [
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        "vulnStatus": "Received"
      }
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:35:20+00:00",
      "cve": "CVE-2026-74428",
      "id": "CVE-2026-74428",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rxrpc: Fix double unlock in rxrpc_recvmsg()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74428.json",
      "version": "3"
    }
  }
}



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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.