CVE-2026-23369

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> i2c: i801: Revert "i2c: i801: replace acpi_lock with I2C bus lock"<br /> <br /> This reverts commit f707d6b9e7c18f669adfdb443906d46cfbaaa0c1.<br /> <br /> Under rare circumstances, multiple udev threads can collect i801 device<br /> info on boot and walk i801_acpi_io_handler somewhat concurrently. The<br /> first will note the area is reserved by acpi to prevent further touches.<br /> This ultimately causes the area to be deregistered. The second will<br /> enter i801_acpi_io_handler after the area is unregistered but before a<br /> check can be made that the area is unregistered. i2c_lock_bus relies on<br /> the now unregistered area containing lock_ops to lock the bus. The end<br /> result is a kernel panic on boot with the following backtrace;<br /> <br /> [ 14.971872] ioatdma 0000:09:00.2: enabling device (0100 -&gt; 0102)<br /> [ 14.971873] BUG: kernel NULL pointer dereference, address: 0000000000000000<br /> [ 14.971880] #PF: supervisor read access in kernel mode<br /> [ 14.971884] #PF: error_code(0x0000) - not-present page<br /> [ 14.971887] PGD 0 P4D 0<br /> [ 14.971894] Oops: 0000 [#1] PREEMPT SMP PTI<br /> [ 14.971900] CPU: 5 PID: 956 Comm: systemd-udevd Not tainted 5.14.0-611.5.1.el9_7.x86_64 #1<br /> [ 14.971905] Hardware name: XXXXXXXXXXXXXXXXXXXXXXX BIOS 1.20.10.SV91 01/30/2023<br /> [ 14.971908] RIP: 0010:i801_acpi_io_handler+0x2d/0xb0 [i2c_i801]<br /> [ 14.971929] Code: 00 00 49 8b 40 20 41 57 41 56 4d 8b b8 30 04 00 00 49 89 ce 41 55 41 89 d5 41 54 49 89 f4 be 02 00 00 00 55 4c 89 c5 53 89 fb 8b 00 4c 89 c7 e8 18 61 54 e9 80 bd 80 04 00 00 00 75 09 4c 3b<br /> [ 14.971933] RSP: 0018:ffffbaa841483838 EFLAGS: 00010282<br /> [ 14.971938] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff9685e01ba568<br /> [ 14.971941] RDX: 0000000000000008 RSI: 0000000000000002 RDI: 0000000000000000<br /> [ 14.971944] RBP: ffff9685ca22f028 R08: ffff9685ca22f028 R09: ffff9685ca22f028<br /> [ 14.971948] R10: 000000000000000b R11: 0000000000000580 R12: 0000000000000580<br /> [ 14.971951] R13: 0000000000000008 R14: ffff9685e01ba568 R15: ffff9685c222f000<br /> [ 14.971954] FS: 00007f8287c0ab40(0000) GS:ffff96a47f940000(0000) knlGS:0000000000000000<br /> [ 14.971959] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> [ 14.971963] CR2: 0000000000000000 CR3: 0000000168090001 CR4: 00000000003706f0<br /> [ 14.971966] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> [ 14.971968] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> [ 14.971972] Call Trace:<br /> [ 14.971977] <br /> [ 14.971981] ? show_trace_log_lvl+0x1c4/0x2df<br /> [ 14.971994] ? show_trace_log_lvl+0x1c4/0x2df<br /> [ 14.972003] ? acpi_ev_address_space_dispatch+0x16e/0x3c0<br /> [ 14.972014] ? __die_body.cold+0x8/0xd<br /> [ 14.972021] ? page_fault_oops+0x132/0x170<br /> [ 14.972028] ? exc_page_fault+0x61/0x150<br /> [ 14.972036] ? asm_exc_page_fault+0x22/0x30<br /> [ 14.972045] ? i801_acpi_io_handler+0x2d/0xb0 [i2c_i801]<br /> [ 14.972061] acpi_ev_address_space_dispatch+0x16e/0x3c0<br /> [ 14.972069] ? __pfx_i801_acpi_io_handler+0x10/0x10 [i2c_i801]<br /> [ 14.972085] acpi_ex_access_region+0x5b/0xd0<br /> [ 14.972093] acpi_ex_field_datum_io+0x73/0x2e0<br /> [ 14.972100] acpi_ex_read_data_from_field+0x8e/0x230<br /> [ 14.972106] acpi_ex_resolve_node_to_value+0x23d/0x310<br /> [ 14.972114] acpi_ds_evaluate_name_path+0xad/0x110<br /> [ 14.972121] acpi_ds_exec_end_op+0x321/0x510<br /> [ 14.972127] acpi_ps_parse_loop+0xf7/0x680<br /> [ 14.972136] acpi_ps_parse_aml+0x17a/0x3d0<br /> [ 14.972143] acpi_ps_execute_method+0x137/0x270<br /> [ 14.972150] acpi_ns_evaluate+0x1f4/0x2e0<br /> [ 14.972158] acpi_evaluate_object+0x134/0x2f0<br /> [ 14.972164] acpi_evaluate_integer+0x50/0xe0<br /> [ 14.972173] ? vsnprintf+0x24b/0x570<br /> [ 14.972181] acpi_ac_get_state.part.0+0x23/0x70<br /> [ 14.972189] get_ac_property+0x4e/0x60<br /> [ 14.972195] power_supply_show_property+0x90/0x1f0<br /> [ 14.972205] add_prop_uevent+0x29/0x90<br /> [ 14.972213] power_supply_uevent+0x109/0x1d0<br /> [ 14.972222] dev_uevent+0x10e/0x2f0<br /> [ 14.972228] uevent_show+0x8e/0x100<br /> [ 14.972236] dev_attr_show+0x19<br /> ---truncated---