{"apiVersion":"1.0","identifier":"CVE-2026-74477","description":"In the Linux kernel, the following vulnerability has been resolved: uprobes: Fix NULL pointer dereference in hprobe_expire() Forking a task that has a pending uretprobe can oops the kernel with a NULL pointer dereference in the clone() path: BUG: kernel NULL pointer dereference, address: 0000000000000018 Oops: 0002 [#1] SMP NOPTI RIP: 0010:hprobe_expire CR2: 0000000000000018 Call Trace: uprobe_copy_process copy_process kernel_clone __x64_sys_clone do_syscall_64 entry_SYSCALL_64_after_hwframe This was found on real hosts on Meta fleet. I-ve got the impression that this is what is happening: CPU 1 CPU 2 (traced task) ----- ------------------- hit uprobe, prepare_uretprobe(): hprobe LEASED, refcount >= 1 uprobe_unregister() put_uprobe(): refcount -> 0 fork() -> dup_utask() hprobe_expire(hprobe, true) try_get_uprobe() -> NULL get_uprobe(NULL) <-- Oops Only take the extra reference when the uprobe is non-NULL; a NULL means it is gone and is the correct value to return.","publishedAt":"2026-08-15T13:17:52","lastModifiedAt":"2026-08-17T06:19:43","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-74477","cvssScore":null,"cvssVector":"Pending","epssProbability":0.00166,"riskScore":0,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-74477","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-74477","en":"https://www.redsauce.net/en/cves/CVE-2026-74477","fr":"https://www.redsauce.net/fr/cves/CVE-2026-74477","pt":"https://www.redsauce.net/pt/cves/CVE-2026-74477","de":"https://www.redsauce.net/de/cves/CVE-2026-74477","sk":"https://www.redsauce.net/sk/cves/CVE-2026-74477","el":"https://www.redsauce.net/el/cves/CVE-2026-74477"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-74477"}}