CVE-2026-31676 (GCVE-0-2026-31676)
Vulnerability from cvelistv5
Published
2026-04-25 08:46
Modified
2026-08-05 12:24
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: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.
References
Impacted products
Vendor Product Version
Linux Linux Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
Version: 17926a79320afa9b95df6b977b40cca6d8713cea
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/rxrpc/conn_event.c"
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              "version": "0",
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              "version": "5.10.258",
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            },
            {
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              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: only handle RESPONSE during service challenge\n\nOnly process RESPONSE packets while the service connection is still in\nRXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before\nrunning response verification and security initialization, then use a local\nsecured flag to decide whether to queue the secured-connection work after\nthe state transition. This keeps duplicate or late RESPONSE packets from\nre-running the setup path and removes the unlocked post-transition state\ntest."
        }
      ],
      "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 is a UDP-based network protocol, and the vulnerable RESPONSE handling is reached by packets sent to a listening AF_RXRPC service endpoint.\nAC:L - The attacker controls the packet timing and can send duplicate or late RESPONSE packets on a service connection; no uncontrollable race or special memory layout is required to trigger repeated setup processing.\nPR:N - The packet path is reached during the service-side authentication handshake before local privileges are required on the target, and a remote peer can exercise it by sending RxRPC protocol packets to the exposed service.\nUI:N - No victim user action is needed once an RxRPC service is listening; packet processing occurs in the kernel receive path.\nS:U - The impact remains within the kernel and the affected RxRPC service security authority, with no VM, sandbox, or separate security-scope escape.\nC:N - The bug re-runs connection security setup and leaks/replaces connection security objects, but I found no direct information disclosure or arbitrary read primitive.\nI:N - The reachable effect is improper repeated security initialization rather than attacker-controlled memory corruption or arbitrary modification of protected data.\nA:H - Repeated late or duplicate RESPONSE packets can repeatedly allocate and leak connection security state and disrupt/abort RxRPC connections, making kernel or service-level denial of service a reasonable impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:24:23.558Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a1a8efde03a40b6c658d580e96644d9b9a2a0d3a"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c3a0fbdafef8316e34ae22333e317a341e737cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/0afdfd4941c1b60a1f5c361760daa970edca60cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/a6bcf8010af093fe04f7100562e9542ab7882585"
        },
        {
          "url": "https://git.kernel.org/stable/c/29b44d904dceb832be880def08b8cb17a0aba91c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0035e634dae83237ab7f5681eb52b2f65d0ceb8"
        },
        {
          "url": "https://git.kernel.org/stable/c/03fd2ef73cb4ffd0af100a95b634af54f474414e"
        },
        {
          "url": "https://git.kernel.org/stable/c/c43ffdcfdbb5567b1f143556df8a04b4eeea041c"
        }
      ],
      "title": "rxrpc: only handle RESPONSE during service challenge",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31676",
    "datePublished": "2026-04-25T08:46:52.285Z",
    "dateReserved": "2026-03-09T15:48:24.130Z",
    "dateUpdated": "2026-08-05T12:24:23.558Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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