{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "75b54cb57ca34cbe7a87c6ac757c55360a624590"
            },
            {
              "fixed": "386c86412608d3449006a318a662cbcd6ca1f668"
            },
            {
              "fixed": "235b2115de892eab2e107a42efa7a4347baaa80b"
            },
            {
              "fixed": "625af53a1564e31bb2df9adc3739df46137f46c1"
            },
            {
              "fixed": "db297c78ce537c9ac96f0eda9b25ad72c8caefa9"
            },
            {
              "fixed": "10ebed83f9f6414af4e85bc85ffaeda7effdd874"
            },
            {
              "fixed": "a44ce6aa2efb61fe44f2cfab72bb01544bbca272"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.9.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.18.23"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31630.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: proc: size address buffers for %pISpc output\n\nThe AF_RXRPC procfs helpers format local and remote socket addresses into\nfixed 50-byte stack buffers with \"%pISpc\".\n\nThat is too small for the longest current-tree IPv6-with-port form the\nformatter can produce. In lib/vsprintf.c, the compressed IPv6 path uses a\ndotted-quad tail not only for v4mapped addresses, but also for ISATAP\naddresses via ipv6_addr_is_isatap().\n\nAs a result, a case such as\n\n  [ffff:ffff:ffff:ffff:0:5efe:255.255.255.255]:65535\n\nis possible with the current formatter. That is 50 visible characters, so\n51 bytes including the trailing NUL, which does not fit in the existing\nchar[50] buffers used by net/rxrpc/proc.c.\n\nSize the buffers from the formatter's maximum textual form and switch the\ncall sites to scnprintf().\n\nChanges since v1:\n- correct the changelog to cite the actual maximum current-tree case\n  explicitly\n- frame the proof around the ISATAP formatting path instead of the earlier\n  mapped-v4 example",
  "id": "CVE-2026-31630",
  "modified": "2026-07-08T05:37:48.526028139Z",
  "published": "2026-04-24T14:44:46.606Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/10ebed83f9f6414af4e85bc85ffaeda7effdd874"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/235b2115de892eab2e107a42efa7a4347baaa80b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/386c86412608d3449006a318a662cbcd6ca1f668"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/625af53a1564e31bb2df9adc3739df46137f46c1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a44ce6aa2efb61fe44f2cfab72bb01544bbca272"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/db297c78ce537c9ac96f0eda9b25ad72c8caefa9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31630.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31630"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "rxrpc: proc: size address buffers for %pISpc output"
}