CVE-2025-40263 - Input: cros_ec_keyb - fix an invalid memory access

CVE-2025-40263 - Input: cros_ec_keyb - fix an invalid memory access

https://cvefeed.io/rssfeed/latest.atom / Thu, 12/04/2025 - 19:51
CVE ID : CVE-2025-40263
Published : Dec. 4, 2025, 4:16 p.m. | 57 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: Input: cros_ec_keyb - fix an invalid memory access If cros_ec_keyb_register_matrix() isn't called (due to `buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev->idev` remains NULL. An invalid memory access is observed in cros_ec_keyb_process() when receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work() in such case. Unable to handle kernel read from unreadable memory at virtual address 0000000000000028 ... x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: input_event cros_ec_keyb_work blocking_notifier_call_chain ec_irq_thread It's still unknown about why the kernel receives such malformed event, in any cases, the kernel shouldn't access `ckdev->idev` and friends if the driver doesn't intend to initialize them.
Severity: 0.0 | NA
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