{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "92aa7c65d295f3cbb96904afe335f683e55584b8"
            },
            {
              "fixed": "9c2f5c0829a8c8b904dae36be6d8056b719ac605"
            },
            {
              "fixed": "80b5c8779acee0550845394fb3e5176a398aa24c"
            },
            {
              "fixed": "cc27aea4d454abfb385ee2c9499c78b96db9b728"
            },
            {
              "fixed": "a8e3a94711134e898c6021a6b77374efa91b3639"
            },
            {
              "fixed": "593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168"
            },
            {
              "fixed": "0beccbcf50de125be5520d0ffc59af4bb8655482"
            },
            {
              "fixed": "b713aa0cc344f10f7a9928a230b5f5e780d04078"
            },
            {
              "fixed": "1720db928e5a58ca7d75ac1d514c3b73fd7061a7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64452.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\n6lowpan: fix NHC entry use-after-free on error path\n\nlowpan_nhc_do_uncompression() looks up an NHC descriptor while holding\nlowpan_nhc_lock.  If the descriptor has no uncompress callback, the error\npath drops the lock before printing nhc-\u003ename.\n\nlowpan_nhc_del() removes descriptors under the same lock and then relies\non synchronize_net() before the owning module can be unloaded.  That only\nwaits for net RX RCU readers.  lowpan_header_decompress() is also exported\nand can be reached from callers that are not necessarily covered by the net\ncore RX critical section, for example the Bluetooth 6LoWPAN L2CAP receive\npath.\n\nThis leaves a race where one task drops lowpan_nhc_lock in the error path,\nanother task unregisters and frees the matching descriptor after\nsynchronize_net() returns, and the first task then dereferences nhc-\u003ename\nfor the warning.\n\nWith the post-unlock window widened, KASAN reports:\n\n  BUG: KASAN: slab-use-after-free in lowpan_nhc_do_uncompression+0x1f4/0x220\n  Read of size 8\n  lowpan_nhc_do_uncompression\n  lowpan_header_decompress\n\nFix this by printing the warning before dropping lowpan_nhc_lock, so the\ndescriptor name is read while unregister is still excluded.  The malformed\npacket is still rejected with -ENOTSUPP.",
  "id": "CVE-2026-64452",
  "modified": "2026-07-27T03:56:15.716758816Z",
  "published": "2026-07-25T08:51:21.754Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0beccbcf50de125be5520d0ffc59af4bb8655482"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1720db928e5a58ca7d75ac1d514c3b73fd7061a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/593b78bb3c7ef0c6e9ae6fdf5afa80a5f7573168"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/80b5c8779acee0550845394fb3e5176a398aa24c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c2f5c0829a8c8b904dae36be6d8056b719ac605"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a8e3a94711134e898c6021a6b77374efa91b3639"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b713aa0cc344f10f7a9928a230b5f5e780d04078"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc27aea4d454abfb385ee2c9499c78b96db9b728"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64452.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64452"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "6lowpan: fix NHC entry use-after-free on error path"
}