CVE-2026-31633 (GCVE-0-2026-31633)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:44 – Updated: 2026-10-19 18:56
VLAI
Title
rxrpc: Fix integer overflow in rxgk_verify_response()
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix integer overflow in rxgk_verify_response() In rxgk_verify_response(), there's a potential integer overflow due to rounding up token_len before checking it, thereby allowing the length check to be bypassed. Fix this by checking the unrounded value against len too (len is limited as the response must fit in a single UDP packet).
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:11 UTC
CWE
  • CWE-190 - Integer Overflow or Wraparound
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a , < 1f864d9daaf622aeaa774404fd51e7d6a435b046 (git)
Affected: 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a , < c1e242beb6b1efc3c286f617e8d940c8fbf2ed41 (git)
Affected: 9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a , < 699e52180f4231c257821c037ed5c99d5eb0edb8 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.23 , ≤ 6.18.* (semver)
Unaffected: 6.19.13 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix integer overflow in rxgk_verify_response()\n\nIn rxgk_verify_response(), there\u0027s a potential integer overflow due to\nrounding up token_len before checking it, thereby allowing the length check to\nbe bypassed.\n\nFix this by checking the unrounded value against len too (len is limited as\nthe response must fit in a single UDP packet)."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "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": [
                {
                  "lang": "en",
                  "value": "AV:N - rxgk_verify_response() is reached by a remote RxRPC RESPONSE packet over UDP on a listening RxRPC service using YFS-RxGK security.\nAC:L - The attacker controls the RESPONSE packet fields needed to trigger the integer overflow; no race or condition outside attacker control is required.\nPR:N - The vulnerable parsing occurs during the service-side challenge/response handshake before the RESPONSE authenticator is verified, so no authenticated credentials are required.\nUI:N - No victim user action is required once an affected RxRPC service is listening and reachable.\nS:U - The impact is within the kernel/RxRPC service security authority and does not cross a separate sandbox, VM, or hardware boundary.\nC:H - The overflow can cause subsequent token/authenticator parsing and crypto scatterlist construction to operate on attacker-controlled impossible lengths, creating out-of-bounds memory access potential.\nI:H - The affected decryption path operates in place over scatterlists derived from corrupted lengths, making kernel memory corruption and control-flow-relevant modification defensible.\nA:H - Related oversized RxGK RESPONSE length paths reach skb_to_sgvec() BUG_ON(len), and this overflow can similarly drive impossible lengths, causing a remote kernel crash."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:23:58.581Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/1f864d9daaf622aeaa774404fd51e7d6a435b046"
            },
            {
              "url": "https://git.kernel.org/stable/c/c1e242beb6b1efc3c286f617e8d940c8fbf2ed41"
            },
            {
              "url": "https://git.kernel.org/stable/c/699e52180f4231c257821c037ed5c99d5eb0edb8"
            }
          ],
          "title": "rxrpc: Fix integer overflow in rxgk_verify_response()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2026-31633",
        "datePublished": "2026-04-24T14:44:48.621Z",
        "dateReserved": "2026-03-09T15:48:24.125Z",
        "dateUpdated": "2026-10-19T18:56:00.901Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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