| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-37781: i2c: cros-ec-tunnel: defer probe if parent EC is not present |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| i2c: cros-ec-tunnel: defer probe if parent EC is not present |
| |
| When i2c-cros-ec-tunnel and the EC driver are built-in, the EC parent |
| device will not be found, leading to NULL pointer dereference. |
| |
| That can also be reproduced by unbinding the controller driver and then |
| loading i2c-cros-ec-tunnel module (or binding the device). |
| |
| [ 271.991245] BUG: kernel NULL pointer dereference, address: 0000000000000058 |
| [ 271.998215] #PF: supervisor read access in kernel mode |
| [ 272.003351] #PF: error_code(0x0000) - not-present page |
| [ 272.008485] PGD 0 P4D 0 |
| [ 272.011022] Oops: Oops: 0000 [#1] SMP NOPTI |
| [ 272.015207] CPU: 0 UID: 0 PID: 3859 Comm: insmod Tainted: G S 6.15.0-rc1-00004-g44722359ed83 #30 PREEMPT(full) 3c7fb39a552e7d949de2ad921a7d6588d3a4fdc5 |
| [ 272.030312] Tainted: [S]=CPU_OUT_OF_SPEC |
| [ 272.034233] Hardware name: HP Berknip/Berknip, BIOS Google_Berknip.13434.356.0 05/17/2021 |
| [ 272.042400] RIP: 0010:ec_i2c_probe+0x2b/0x1c0 [i2c_cros_ec_tunnel] |
| [ 272.048577] Code: 1f 44 00 00 41 57 41 56 41 55 41 54 53 48 83 ec 10 65 48 8b 05 06 a0 6c e7 48 89 44 24 08 4c 8d 7f 10 48 8b 47 50 4c 8b 60 78 <49> 83 7c 24 58 00 0f 84 2f 01 00 00 48 89 fb be 30 06 00 00 4c 9 |
| [ 272.067317] RSP: 0018:ffffa32082a03940 EFLAGS: 00010282 |
| [ 272.072541] RAX: ffff969580b6a810 RBX: ffff969580b68c10 RCX: 0000000000000000 |
| [ 272.079672] RDX: 0000000000000000 RSI: 0000000000000282 RDI: ffff969580b68c00 |
| [ 272.086804] RBP: 00000000fffffdfb R08: 0000000000000000 R09: 0000000000000000 |
| [ 272.093936] R10: 0000000000000000 R11: ffffffffc0600000 R12: 0000000000000000 |
| [ 272.101067] R13: ffffffffa666fbb8 R14: ffffffffc05b5528 R15: ffff969580b68c10 |
| [ 272.108198] FS: 00007b930906fc40(0000) GS:ffff969603149000(0000) knlGS:0000000000000000 |
| [ 272.116282] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| [ 272.122024] CR2: 0000000000000058 CR3: 000000012631c000 CR4: 00000000003506f0 |
| [ 272.129155] Call Trace: |
| [ 272.131606] <TASK> |
| [ 272.133709] ? acpi_dev_pm_attach+0xdd/0x110 |
| [ 272.137985] platform_probe+0x69/0xa0 |
| [ 272.141652] really_probe+0x152/0x310 |
| [ 272.145318] __driver_probe_device+0x77/0x110 |
| [ 272.149678] driver_probe_device+0x1e/0x190 |
| [ 272.153864] __driver_attach+0x10b/0x1e0 |
| [ 272.157790] ? driver_attach+0x20/0x20 |
| [ 272.161542] bus_for_each_dev+0x107/0x150 |
| [ 272.165553] bus_add_driver+0x15d/0x270 |
| [ 272.169392] driver_register+0x65/0x110 |
| [ 272.173232] ? cleanup_module+0xa80/0xa80 [i2c_cros_ec_tunnel 3a00532f3f4af4a9eade753f86b0f8dd4e4e5698] |
| [ 272.182617] do_one_initcall+0x110/0x350 |
| [ 272.186543] ? security_kernfs_init_security+0x49/0xd0 |
| [ 272.191682] ? __kernfs_new_node+0x1b9/0x240 |
| [ 272.195954] ? security_kernfs_init_security+0x49/0xd0 |
| [ 272.201093] ? __kernfs_new_node+0x1b9/0x240 |
| [ 272.205365] ? kernfs_link_sibling+0x105/0x130 |
| [ 272.209810] ? kernfs_next_descendant_post+0x1c/0xa0 |
| [ 272.214773] ? kernfs_activate+0x57/0x70 |
| [ 272.218699] ? kernfs_add_one+0x118/0x160 |
| [ 272.222710] ? __kernfs_create_file+0x71/0xa0 |
| [ 272.227069] ? sysfs_add_bin_file_mode_ns+0xd6/0x110 |
| [ 272.232033] ? internal_create_group+0x453/0x4a0 |
| [ 272.236651] ? __vunmap_range_noflush+0x214/0x2d0 |
| [ 272.241355] ? __free_frozen_pages+0x1dc/0x420 |
| [ 272.245799] ? free_vmap_area_noflush+0x10a/0x1c0 |
| [ 272.250505] ? load_module+0x1509/0x16f0 |
| [ 272.254431] do_init_module+0x60/0x230 |
| [ 272.258181] __se_sys_finit_module+0x27a/0x370 |
| [ 272.262627] do_syscall_64+0x6a/0xf0 |
| [ 272.266206] ? do_syscall_64+0x76/0xf0 |
| [ 272.269956] ? irqentry_exit_to_user_mode+0x79/0x90 |
| [ 272.274836] entry_SYSCALL_64_after_hwframe+0x55/0x5d |
| [ 272.279887] RIP: 0033:0x7b9309168d39 |
| [ 272.283466] Code: 5b 41 5c 5d c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 8b 0d af 40 0c 00 f7 d8 64 89 01 8 |
| [ 272.302210] RSP: 002b:00007fff50f1a288 EFLAGS: 00000246 ORIG_RAX: 0000000000000139 |
| [ 272.309774] RAX: ffffffffffffffda RBX: 000058bf9b50f6d0 RCX: 00007b9309168d39 |
| [ 272.316905] RDX: 0000000000000000 RSI: 000058bf6c103a77 RDI: 0000000000000003 |
| [ 272.324036] RBP: 00007fff50f1a2e0 R08: 00007fff50f19218 R09: 0000000021ec4150 |
| [ 272.331166] R10: 000058bf9b50f7f0 R11: 0000000000000246 R12: 0000000000000000 |
| [ 272.338296] R13: 00000000fffffffe R14: 0000000000000000 R15: 000058bf6c103a77 |
| [ 272.345428] </TASK> |
| [ 272.347617] Modules linked in: i2c_cros_ec_tunnel(+) |
| [ 272.364585] gsmi: Log Shutdown Reason 0x03 |
| |
| Returning -EPROBE_DEFER will allow the device to be bound once the |
| controller is bound, in the case of built-in drivers. |
| |
| The Linux kernel CVE team has assigned CVE-2025-37781 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 5.4.293 with commit 092de5ac8cb2eaa9593a765fa92ba39d8173f984 |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 5.10.237 with commit b66d4910a608427367c4e21499e149f085782df7 |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 5.15.181 with commit cd83035b6f2a102c2d5acd3bfb2a11ff967aaba6 |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 6.1.135 with commit 3090cad5ccff8963b95160f4060068048a1e4c4c |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 6.6.88 with commit e89bf1311d4497c6743f3021e9c481b16c3a41c9 |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 6.12.25 with commit 1355b5ca4782be85a2ef7275e4c508f770d0fb27 |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 6.14.4 with commit da8edc9eb2516aface7f86be5fa6d09c0d07b9f8 |
| Issue introduced in 3.16 with commit 9d230c9e4f4e67cb1c1cb9e0f6142da16b0f2796 and fixed in 6.15 with commit 424eafe65647a8d6c690284536e711977153195a |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2025-37781 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/i2c/busses/i2c-cros-ec-tunnel.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/092de5ac8cb2eaa9593a765fa92ba39d8173f984 |
| https://git.kernel.org/stable/c/b66d4910a608427367c4e21499e149f085782df7 |
| https://git.kernel.org/stable/c/cd83035b6f2a102c2d5acd3bfb2a11ff967aaba6 |
| https://git.kernel.org/stable/c/3090cad5ccff8963b95160f4060068048a1e4c4c |
| https://git.kernel.org/stable/c/e89bf1311d4497c6743f3021e9c481b16c3a41c9 |
| https://git.kernel.org/stable/c/1355b5ca4782be85a2ef7275e4c508f770d0fb27 |
| https://git.kernel.org/stable/c/da8edc9eb2516aface7f86be5fa6d09c0d07b9f8 |
| https://git.kernel.org/stable/c/424eafe65647a8d6c690284536e711977153195a |
