{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-80851",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-80851"
  ],
  "published": "2026-09-04T15:53:40Z",
  "summary": "gtp: serialize PDP context updates",
  "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.",
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": null,
            "compiled_filter": false
          }
        }
      }
    },
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:13",
        "name": "linux"
      },
      "versions": [
        "1:6.18.39-1+rpt1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-2712",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v6",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v7",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v8",
            "binary_version": "1:6.18.39-1+rpt1"
          },
          {
            "binary_name": "linux-image-6.18.39+rpt-rpi-v8-rt",
            "binary_version": "1:6.18.39-1+rpt1"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.49"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-80851"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b4ac2a5ce5a96ec21ed48f60d30b52b1fb22c62a"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5f77ddb2756340c1b05381674ca025d52998005e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d950e98f74af9611925a5226edced02155f6ed1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6df4f05bc2991467939d7d80b6f7e121559cc3df"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1e995498d29784a06a2b2899370a1926cfc8410d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/498386b6d402737db1e2eeed4c385acbf0ef9e34"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z"
  }
}