{"id":"CVE-2026-64469","summary":"binder: fix UAF in binder_thread_release()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_thread_release()\n\nWhen a thread exits, binder_thread_release() walks its transaction stack\nto clear the t-\u003efrom and t-\u003eto_proc that correspond with the exiting\nthread. However, a process dying in parallel might attempt to kfree some\nof these transactions. And if one of them has no associated t-\u003eto_proc,\nthe t-\u003eto_proc-\u003einner_lock will not be acquired.\n\nThis means that transaction accesses in binder_thread_release() after\nt-\u003eto_proc has been cleared might race with binder_free_transaction()\nand cause a use-after-free error as reported by KASAN:\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in binder_thread_release+0x5d0/0x798\n  Write of size 8 at addr ffff000016627500 by task X/715\n\n  CPU: 17 UID: 0 PID: 715 Comm: X Not tainted 7.1.0-rc5-00149-g8fde5d1d47f6 #30 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  Call trace:\n   binder_thread_release+0x5d0/0x798\n   binder_ioctl+0x12c0/0x299c\n   [...]\n\n  Allocated by task 717 on cpu 18 at 67.267803s:\n   __kasan_kmalloc+0xa0/0xbc\n   __kmalloc_cache_noprof+0x174/0x444\n   binder_transaction+0x554/0x8150\n   binder_thread_write+0xa30/0x4354\n   binder_ioctl+0x20f0/0x299c\n   [...]\n\n  Freed by task 202 on cpu 18 at 90.416221s:\n   __kasan_slab_free+0x58/0x80\n   kfree+0x1a0/0x4a4\n   binder_free_transaction+0x150/0x294\n   binder_send_failed_reply+0x398/0x6d8\n   binder_release_work+0x3e4/0x4ec\n   binder_deferred_func+0xbd8/0x104c\n   [...]\n  ==================================================================\n\nIn order to avoid this, make sure that binder_free_transaction() reads\nthe t-\u003eto_proc under the transaction lock. This will serialize the\ntransaction release with the accesses in binder_thread_release(). Plus,\nit matches the documented locking rules for @to_proc.","modified":"2026-08-18T03:30:57.893786418Z","published":"2026-07-25T08:51:34.025Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64469.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/114a116aaa5f0295376cdf12da743c5bce3b20ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082"},{"type":"WEB","url":"https://git.kernel.org/stable/c/38e1a71728e5795b670cc159c18e286a40aeebb4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/df1a17abba8d6fac5f965adcb8113ceace6e4949"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e63032dc715026a96bcaa13d375a8e15c91caa84"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ea02df466df60ecd758eb3b4df3f0cadc5c886ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef5439ba5b9ac93349f5df12ef88b42a0ce26340"},{"type":"WEB","url":"https://git.kernel.org/stable/c/faa070c7ad8ba25dcd0b12d7cdbb419e336f5391"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64469.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64469"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7a4408c6bd3eb1dafba67986259191be081e3efb"},{"fixed":"1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082"},{"fixed":"df1a17abba8d6fac5f965adcb8113ceace6e4949"},{"fixed":"38e1a71728e5795b670cc159c18e286a40aeebb4"},{"fixed":"faa070c7ad8ba25dcd0b12d7cdbb419e336f5391"},{"fixed":"e63032dc715026a96bcaa13d375a8e15c91caa84"},{"fixed":"ea02df466df60ecd758eb3b4df3f0cadc5c886ce"},{"fixed":"ef5439ba5b9ac93349f5df12ef88b42a0ce26340"},{"fixed":"114a116aaa5f0295376cdf12da743c5bce3b20ce"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64469.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.14.0"},{"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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64469.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}