FKIE_CVE-2025-40263

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2025-12-06 22:15
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2d251c15c27e2dd16d6318425d2f7260cbd47d39
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6d81068685154535af06163eb585d6d9663ec7ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/729d21c82c1b0504ffccb17cc261bf32e024fd0f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7bfd959187f2c7584bb43280bbc7b2846e7a5085
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b5ae1521660c16fa830ff17d16e650b4905b71a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9cf59f4724a9ee06ebb06c76b8678ac322e850b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d74864291cb8bd784d44d1d02e87109cf88666bb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e08969c4d65ac31297fcb4d31d4808c789152f68
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: cros_ec_keyb - fix an invalid memory access\n\nIf cros_ec_keyb_register_matrix() isn\u0027t called (due to\n`buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev-\u003eidev` remains\nNULL.  An invalid memory access is observed in cros_ec_keyb_process()\nwhen receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work()\nin such case.\n\n  Unable to handle kernel read from unreadable memory at virtual address 0000000000000028\n  ...\n  x3 : 0000000000000000 x2 : 0000000000000000\n  x1 : 0000000000000000 x0 : 0000000000000000\n  Call trace:\n  input_event\n  cros_ec_keyb_work\n  blocking_notifier_call_chain\n  ec_irq_thread\n\nIt\u0027s still unknown about why the kernel receives such malformed event,\nin any cases, the kernel shouldn\u0027t access `ckdev-\u003eidev` and friends if\nthe driver doesn\u0027t intend to initialize them."
    }
  ],
  "id": "CVE-2025-40263",
  "lastModified": "2025-12-06T22:15:53.923",
  "metrics": {},
  "published": "2025-12-04T16:16:20.340",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2d251c15c27e2dd16d6318425d2f7260cbd47d39"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6d81068685154535af06163eb585d6d9663ec7ec"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/729d21c82c1b0504ffccb17cc261bf32e024fd0f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7bfd959187f2c7584bb43280bbc7b2846e7a5085"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8b5ae1521660c16fa830ff17d16e650b4905b71a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9cf59f4724a9ee06ebb06c76b8678ac322e850b7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d74864291cb8bd784d44d1d02e87109cf88666bb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e08969c4d65ac31297fcb4d31d4808c789152f68"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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