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AHgh+RqzGJ3oo2yNury3jW6EzssP1akQlbacL1IQ6UVxgF8xnMNXABRXmvnXAqJ0CDMlrgJhdg+5vsLIo+mkQfY=@vger.kernel.org X-Gm-Message-State: AFuF++k3tJe+IpkAkeCsgYkQkkbRXwO2dTE3RsJcOY60YaCUJKgbABVJ pqw4IkoT5KgF7M8k4+2JsG4wrkqNL1SicnrOE2IfSaEPjDPtE/6YVdGuh/p+eIB3bMDAq4aK21w MFKuyA81ga/3PZfayCrF7FM73tyBWhlpkGNXjZdsSNxdTF4nZPHxbgI/qXko= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:1029:b0:4b3:1a95:4160 with SMTP id 5614622812f47-4b31a954e94mr8806975b6e.18.1787549738177; Sun, 23 Aug 2026 22:35:38 -0700 (PDT) Date: Sun, 23 Aug 2026 22:35:38 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8bd82a.dbb3a75c.13dd47.0060.GAE@google.com> Subject: [syzbot] [kernel?] KASAN: global-out-of-bounds Read in uevent_store From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 9d2ed026f031 Merge tag 'sysctl-7.03-rc1' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13921e79580000 kernel config: https://syzkaller.appspot.com/x/.config?x=996f19b48f3c7123 dashboard link: https://syzkaller.appspot.com/bug?extid=d164947c037324221043 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164f5e79580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-9d2ed026.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dbab070bbde5/vmlinux-9d2ed026.xz kernel image: https://storage.googleapis.com/syzbot-assets/857014a70033/bzImage-9d2ed026.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d164947c037324221043@syzkaller.appspotmail.com ================================================================== BUG: KASAN: global-out-of-bounds in kobject_action_type lib/kobject_uevent.c:86 [inline] BUG: KASAN: global-out-of-bounds in kobject_synth_uevent+0x79d/0x7d0 lib/kobject_uevent.c:200 Read of size 1 at addr ffffffff8d7101be by task syz.0.17/5909 CPU: 3 UID: 0 PID: 5909 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 kobject_action_type lib/kobject_uevent.c:86 [inline] kobject_synth_uevent+0x79d/0x7d0 lib/kobject_uevent.c:200 uevent_store+0x46/0x90 drivers/base/bus.c:723 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f044c59e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd04c3e3e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f044c825fa0 RCX: 00007f044c59e0d9 RDX: 000000000000003f RSI: 0000200000000300 RDI: 0000000000000003 RBP: 00007f044c635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f044c825fac R14: 00007f044c825fa0 R15: 00007f044c825fa0 The buggy address belongs to the variable: uevent_helper_sysctl_table+0xde/0x2a0 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xd710 flags: 0xfff00000002000(reserved|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000002000 ffffea000035c408 ffffea000035c408 0000000000000000 raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner info is not present (never set?) Memory state around the buggy address: ffffffff8d710080: f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 ffffffff8d710100: 00 00 00 f9 f9 f9 f9 f9 00 07 f9 f9 f9 f9 f9 f9 >ffffffff8d710180: 04 f9 f9 f9 f9 f9 f9 f9 07 f9 f9 f9 f9 f9 f9 f9 ^ ffffffff8d710200: 07 f9 f9 f9 f9 f9 f9 f9 05 f9 f9 f9 f9 f9 f9 f9 ffffffff8d710280: 07 f9 f9 f9 f9 f9 f9 f9 00 f9 f9 f9 f9 f9 f9 f9 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup