CVE-2025-40263
UnknownSummary
W jądrze Linuxa zidentyfikowano podatność związaną z nieprawidłowym dostępem do pamięci w funkcji cros_ec_keyb_process(). Problem występuje, gdy funkcja cros_ec_keyb_register_matrix() nie jest wywoływana, co prowadzi do sytuacji, w której wskaźnik `ckdev->idev` pozostaje NULL, a jądro próbuje uzyskać dostęp do nieczytelnej pamięci.
Risk Assessment
Podatność ta może prowadzić do awarii jądra, co zagraża stabilności systemu operacyjnego. W przypadku wykorzystania tej luki, atakujący może spowodować nieprzewidziane zachowanie systemu.
Recommendation
Zaleca się aktualizację jądra Linuxa do najnowszej wersji, w której ta podatność została naprawiona. Należy również monitorować logi systemowe w celu wykrycia potencjalnych prób wykorzystania tej luki.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS