{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "dd1a7567784e2b1f80258be04f57bcfa82c997eb"
            },
            {
              "fixed": "3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"
            },
            {
              "fixed": "06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"
            },
            {
              "fixed": "cc679d7a6303e84d769f2afcde1fc51c51f127cd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.44"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74477.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  Oops: 0002 [#1] SMP NOPTI\n  RIP: 0010:hprobe_expire\n  CR2: 0000000000000018\n  Call Trace:\n   uprobe_copy_process\n   copy_process\n   kernel_clone\n   __x64_sys_clone\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI've got the impression that this is what is happening:\n\n  CPU 1                          CPU 2 (traced task)\n  -----                          -------------------\n                                 hit uprobe, prepare_uretprobe():\n                                   hprobe LEASED, refcount \u003e= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -\u003e 0\n                                 fork() -\u003e dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -\u003e NULL\n                                     get_uprobe(NULL)   \u003c-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return.",
  "id": "CVE-2026-74477",
  "modified": "2026-08-18T03:31:14.405328955Z",
  "published": "2026-08-15T12:27:11.938Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74477.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74477"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "uprobes: Fix NULL pointer dereference in hprobe_expire()"
}