{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "459aa660eb1d8ce67080da1983bb81d716aa5a69"
            },
            {
              "fixed": "5f77ddb2756340c1b05381674ca025d52998005e"
            },
            {
              "fixed": "3d950e98f74af9611925a5226edced02155f6ed1"
            },
            {
              "fixed": "6df4f05bc2991467939d7d80b6f7e121559cc3df"
            },
            {
              "fixed": "1e995498d29784a06a2b2899370a1926cfc8410d"
            },
            {
              "fixed": "498386b6d402737db1e2eeed4c385acbf0ef9e34"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.7.0"
            },
            {
              "fixed": "6.12.108"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.49"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.13"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80851.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ngtp: serialize PDP context updates\n\nPDP contexts can be deleted through GTP_CMD_DELPDP or while the GTP\nnetwork device is being unregistered. The latter is serialized by RTNL,\nbut the generic-netlink delete path only holds RCU.\n\nRunning both paths concurrently can therefore make both paths delete the\nsame PDP context. The issue was found through static analysis and\nreproduced on a KASAN-enabled kernel by a simple two-thread program\nracing GTP_CMD_DELPDP against RTM_DELLINK:\n\n  Oops: general protection fault, probably for non-canonical address\n  KASAN: maybe wild-memory-access in range\n         [0xdead000000000120-0xdead000000000127]\n  RIP: gtp_genl_del_pdp+0x1c1/0x420 [gtp]\n  RBP: dead000000000122\n\nThe second deletion dereferenced the poisoned hlist pprev pointer.\n\nSerialize gtp_pdp_add(), gtp_genl_del_pdp(), and gtp_dellink() with a\nshared mutex. Keep the mutex held until the final use of a PDP context in\nthe NEWPDP path, and keep the RCU read-side section around the complete\nPDP context use in the DELPDP path.",
  "id": "CVE-2026-80851",
  "modified": "2026-09-06T03:30:16.363863248Z",
  "published": "2026-09-04T15:55:01.667Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1e995498d29784a06a2b2899370a1926cfc8410d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d950e98f74af9611925a5226edced02155f6ed1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/498386b6d402737db1e2eeed4c385acbf0ef9e34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f77ddb2756340c1b05381674ca025d52998005e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6df4f05bc2991467939d7d80b6f7e121559cc3df"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80851.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80851"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "gtp: serialize PDP context updates"
}