CVE-2026-74431 (GCVE-0-2026-74431)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:47
VLAI
Title
rxrpc: Fix potential infinite loop in rxrpc_recvmsg()
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix potential infinite loop in rxrpc_recvmsg() Fix the wait in rxrpc_recvmsg() also take check the oob queue.
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: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < 0fc5b37faec26241d3cbee732e29ac35ad3184f8 (git)
Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < da371b003a4a44f44741275d5e8dc74181cbb017 (git)
Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < 67a0332f442ef07713cd2d9c13d59db0f1c23648 (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": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/recvmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "versionType": "semver"
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            }
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      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
            }
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential infinite loop in rxrpc_recvmsg()\n\nFix the wait in rxrpc_recvmsg() also take check the oob queue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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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"
          },
          "scenarios": [
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              "lang": "en",
              "value": "AV:N - RxRPC processes CHALLENGE packets from remote UDP peers in net/rxrpc/io_thread.c through rxrpc_input_conn_packet() into recvmsg_oobq; a malicious or compromised AFS/YFS fileserver can deliver the trigger over the network without local access.\nAC:L - Once a victim RxGK client with RXRPC_MANAGE_RESPONSE has an established connection, a remote peer can send a valid CHALLENGE at any time and reliably strand a blocking recvmsg() in the defective wait path whenever recvmsg_q is empty but recvmsg_oobq is not.\nPR:N - Exploitation requires only the ability to act as the remote RxRPC server peer on an existing client connection; the attacker needs no local account, capabilities, or authentication on the victim host.\nUI:N - The hang is triggered during normal blocking recvmsg() operation while waiting for call data; no additional victim action beyond routine client connectivity is required at exploitation time.\nS:U - Impact is confined to the kernel thread executing recvmsg() on the affected AF_RXRPC socket within the same security authority; there is no cross-boundary escape to other VMs, containers, or privilege domains.\nC:N - This is a control-flow logic error in the recvmsg() wait loop with no out-of-bounds access, use-after-free, or information disclosure; no memory is read or leaked to the attacker.\nI:N - The bug causes an infinite busy-loop in recvmsg() without modifying kernel or user data, corrupting memory, or enabling arbitrary writes or code execution.\nA:H - When recvmsg_q is empty but recvmsg_oobq holds a CHALLENGE, the pre-fix code re-enters try_again without sleeping or dequeuing OOB data, causing an infinite kernel loop that hangs the calling thread and can saturate a CPU core."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:47:06.624Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0fc5b37faec26241d3cbee732e29ac35ad3184f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/da371b003a4a44f44741275d5e8dc74181cbb017"
        },
        {
          "url": "https://git.kernel.org/stable/c/67a0332f442ef07713cd2d9c13d59db0f1c23648"
        }
      ],
      "title": "rxrpc: Fix potential infinite loop in rxrpc_recvmsg()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74431",
    "datePublished": "2026-08-15T05:59:31.586Z",
    "dateReserved": "2026-08-15T05:44:03.895Z",
    "dateUpdated": "2026-08-17T05:47:06.624Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-20",
      "epss": "0.00335",
      "percentile": "0.26925"
    },
    "nvd": {
      "cve": {
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                    "version": "7.1.5",
                    "versionType": "semver"
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                  }
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix potential infinite loop in rxrpc_recvmsg()\n\nFix the wait in rxrpc_recvmsg() also take check the oob queue."
          }
        ],
        "id": "CVE-2026-74431",
        "lastModified": "2026-08-17T06:19:38.723",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "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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              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-08-15T06:22:45.227",
        "references": [
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            "url": "https://git.kernel.org/stable/c/0fc5b37faec26241d3cbee732e29ac35ad3184f8"
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T10:38:00+00:00",
      "cve": "CVE-2026-74431",
      "id": "CVE-2026-74431",
      "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 potential infinite loop in rxrpc_recvmsg()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74431.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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