Vulnerability-Lookup

FKIE_CVE-2026-74431

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0fc5b37faec26241d3cbee732e29ac35ad3184f8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/67a0332f442ef07713cd2d9c13d59db0f1c23648
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/da371b003a4a44f44741275d5e8dc74181cbb017

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/recvmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0fc5b37faec26241d3cbee732e29ac35ad3184f8",
              "status": "affected",
              "version": "5800b1cf3fd8ccab752a101865be1e76dac33142",
              "versionType": "git"
            },
            {
              "lessThan": "da371b003a4a44f44741275d5e8dc74181cbb017",
              "status": "affected",
              "version": "5800b1cf3fd8ccab752a101865be1e76dac33142",
              "versionType": "git"
            },
            {
              "lessThan": "67a0332f442ef07713cd2d9c13d59db0f1c23648",
              "status": "affected",
              "version": "5800b1cf3fd8ccab752a101865be1e76dac33142",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/recvmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-15T06:22:45.227",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0fc5b37faec26241d3cbee732e29ac35ad3184f8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67a0332f442ef07713cd2d9c13d59db0f1c23648"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/da371b003a4a44f44741275d5e8dc74181cbb017"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:47

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

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/0fc5b37faec26241d…
https://git.kernel.org/stable/c/da371b003a4a44f44…
https://git.kernel.org/stable/c/67a0332f442ef0771…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < 0fc5b37faec26241d3cbee732e29ac35ad3184f8 (git) Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < da371b003a4a44f44741275d5e8dc74181cbb017 (git) Affected: 5800b1cf3fd8ccab752a101865be1e76dac33142 , < 67a0332f442ef07713cd2d9c13d59db0f1c23648 (git)
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)

Show details on NVD website

JSON

To clipboard

{
  "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",
          "versions": [
            {
              "lessThan": "0fc5b37faec26241d3cbee732e29ac35ad3184f8",
              "status": "affected",
              "version": "5800b1cf3fd8ccab752a101865be1e76dac33142",
              "versionType": "git"
            },
            {
              "lessThan": "da371b003a4a44f44741275d5e8dc74181cbb017",
              "status": "affected",
              "version": "5800b1cf3fd8ccab752a101865be1e76dac33142",
              "versionType": "git"
            },
            {
              "lessThan": "67a0332f442ef07713cd2d9c13d59db0f1c23648",
              "status": "affected",
              "version": "5800b1cf3fd8ccab752a101865be1e76dac33142",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/recvmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "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": "6.18.40",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "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 - 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()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
}

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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FKIE_CVE-2026-74431

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

Tags

Sightings

Nomenclature