CVE-2025-40263
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.
Affected versions
Linux kernel versions
5.19
and later are affected. Fixed in
6.1.159,
6.6.118,
6.12.60,
6.17.10,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40263 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/2d251c15c27e2dd16d6318425d2f7260cbd47d39
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PatchKernel patch commithttps://git.kernel.org/stable/c/6d81068685154535af06163eb585d6d9663ec7ec
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PatchKernel patch commithttps://git.kernel.org/stable/c/9cf59f4724a9ee06ebb06c76b8678ac322e850b7
Frequently asked questions
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What is CVE-2025-40263?
CVE-2025-40263 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.19 onward and has been patched in 6.1.159, 6.6.118, 6.12.60 and others. CVE-2025-40263 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40263?
Yes — CVE-2025-40263 has been patched. Fixed versions include 6.1.159, 6.6.118, 6.12.60 and others. If you are running Linux kernel 5.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40263 actively exploited?
No — CVE-2025-40263 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.