{"cve":"CVE-2026-74477","nvd":{"published":"2026-08-15T13:17:52.497","modified":"2026-08-17T06:19:43.777","status":"Received","description":"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 >= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -> 0\n                                 fork() -> dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -> NULL\n                                     get_uprobe(NULL)   <-- 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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0","https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa","https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:49:10.689564601+00:00"},"epss":{"cve":"CVE-2026-74477","score":0.00206,"percentile":0.10748,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}