{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d618d09a68e4eed7a435beb2e355250f6f40664a"
            },
            {
              "fixed": "a438975a6dcdbd70865978c021650d1485586f0b"
            },
            {
              "fixed": "4ee4deadaae7cb2e3d53af0fc889cf92a73413c0"
            },
            {
              "fixed": "d3556656c6daebf8def751c7e71d11dd0a180d24"
            },
            {
              "fixed": "0274f24485fc38032d4093e463dc3ff5c7a667c9"
            },
            {
              "fixed": "4d104882bc815d4ec666ace9155f5f52715879a6"
            },
            {
              "fixed": "1d5e589055880fae229e229e1929e087dbe08cf3"
            },
            {
              "fixed": "29940fff14110ca48c5ccc168d121665b51bb778"
            },
            {
              "fixed": "d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.15.0"
            },
            {
              "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": "6.6.141"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.91"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.33"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52993.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix double-free in tipc_buf_append()\n\ntipc_msg_validate() can potentially reallocate the skb it is validating,\nfreeing the old one.  In tipc_buf_append(), it was being called with a\npointer to a local variable which was a copy of the caller's skb\npointer.\n\nIf the skb was reallocated and validation subsequently failed, the error\nhandling path would free the original skb pointer, which had already\nbeen freed, leading to double-free.\n\nFix this by checking if head now points to a newly allocated reassembled\nskb.  If it does, reassign *headbuf for later freeing operations.",
  "id": "CVE-2026-52993",
  "modified": "2026-07-12T03:55:06.792326599Z",
  "published": "2026-06-24T16:29:06.475Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0274f24485fc38032d4093e463dc3ff5c7a667c9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24"
    },
    {
      "type": "WEB",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52993.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/security/cve/CVE-2026-52993"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52993.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52993"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492437"
    },
    {
      "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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tipc: fix double-free in tipc_buf_append()"
}