{"cve":"CVE-2022-49939","nvd":{"published":"2025-06-18T11:15:20.793","modified":"2026-08-04T10:18:00.300","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF of ref->proc caused by race condition\n\nA transaction of type BINDER_TYPE_WEAK_HANDLE can fail to increment the\nreference for a node. In this case, the target proc normally releases\nthe failed reference upon close as expected. However, if the target is\ndying in parallel the call will race with binder_deferred_release(), so\nthe target could have released all of its references by now leaving the\ncleanup of the new failed reference unhandled.\n\nThe transaction then ends and the target proc gets released making the\nref->proc now a dangling pointer. Later on, ref->node is closed and we\nattempt to take spin_lock(&ref->proc->inner_lock), which leads to the\nuse-after-free bug reported below. Let's fix this by cleaning up the\nfailed reference on the spot instead of relying on the target to do so.\n\n  ==================================================================\n  BUG: KASAN: use-after-free in _raw_spin_lock+0xa8/0x150\n  Write of size 4 at addr ffff5ca207094238 by task kworker/1:0/590\n\n  CPU: 1 PID: 590 Comm: kworker/1:0 Not tainted 5.19.0-rc8 #10\n  Hardware name: linux,dummy-virt (DT)\n  Workqueue: events binder_deferred_func\n  Call trace:\n   dump_backtrace.part.0+0x1d0/0x1e0\n   show_stack+0x18/0x70\n   dump_stack_lvl+0x68/0x84\n   print_report+0x2e4/0x61c\n   kasan_report+0xa4/0x110\n   kasan_check_range+0xfc/0x1a4\n   __kasan_check_write+0x3c/0x50\n   _raw_spin_lock+0xa8/0x150\n   binder_deferred_func+0x5e0/0x9b0\n   process_one_work+0x38c/0x5f0\n   worker_thread+0x9c/0x694\n   kthread+0x188/0x190\n   ret_from_fork+0x10/0x20","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.0},"cwes":["CWE-362","CWE-416"],"references":["https://git.kernel.org/stable/c/06e5b43ca4dab06a92bf4c2f33766e6fb11b880a","https://git.kernel.org/stable/c/229f47603dd306bc0eb1a831439adb8e48bb0eae","https://git.kernel.org/stable/c/30d0901b307f27d36b2655fb3048cf31ee0e89c0","https://git.kernel.org/stable/c/603a47f2ae56bf68288784d3c0a8c5b8e0a827ed","https://git.kernel.org/stable/c/9629f2dfdb1dad294b468038ff8e161e94d0b609"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2022-49939","score":0.00172,"percentile":0.06566,"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."]}