From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AAD6A1D63D1 for ; Thu, 4 Dec 2025 16:08:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764864524; cv=none; b=q/cRevOtStv/L8CuulBXOOLdYC/o9l/XHCEVPGlEd6K+PZzlPxIb8wWWpNnnxOfCY1Lh5tQI+NUzhc8fHYpoOCRin2cI7UD8t6RfYa1yW4qJ9mU1btfpgEgD7+hQJ32SJkfDh58lxTg8OlMXOAP1RGFqVAEgUA5sF2ScOY+BK3c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764864524; c=relaxed/simple; bh=M0bLxNc8VVuT73DWSUItQ/ZN2USvycmbZlbDM7pdQZQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=VDFpKfp9A95tcdXrn72ayjbFYG3zzfZ3UUhq5UBAjfZzhvCD5AbqWdC4H1fBopvbPLn1aJmzjCGnxJk8a0vcX3vcpSNtmB70SFOv3J3Q2GhrA4WEyq9nTzdRV9P9YDQR6D5662Os4stlh2mnApV4h19yrwJ6zQrJOJbvpuDmEx8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Q6OUkkBP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Q6OUkkBP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CD307C4CEFB; Thu, 4 Dec 2025 16:08:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764864524; bh=M0bLxNc8VVuT73DWSUItQ/ZN2USvycmbZlbDM7pdQZQ=; h=From:To:Cc:Subject:Date:Reply-To:From; b=Q6OUkkBPlH5Qi/HzbWJNedjP4GALhXioJQyBuDyLnoqNtFLOuVN0xPb1DOBrMUUSG XTtLHaQVVjvOzKV13Mp1uaTnPnU+wRcNuPI+Z4EUmV9KY1nKvKp5UUGKAhOmMQ8uPK tgxt250IqBqxiIBRbo21G/C+FI5JoWtoIXH3Gb9I= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2025-40263: Input: cros_ec_keyb - fix an invalid memory access Date: Thu, 4 Dec 2025 16:57:44 +0100 Message-ID: <2025120434-CVE-2025-40263-bfaa@gregkh> X-Mailer: git-send-email 2.52.0 Reply-To: , Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2822; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=GVfaPbMgXe6hz1Ekg1pFSw/3SyaifUyXZGRGyl+sAfc=; b=owGbwMvMwCRo6H6F97bub03G02pJDJmG6/N41a2/mlu/F97Qv+ZjiFV+gPPiOKG/C2R6Fz0zW z838df7jlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZhI3GaGBfOn7H93/d21+pRC 7Qr1ba+Tttju0GNYcDP2fu/9j3zL5dp/yO+ZpedTY1q5DQA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman 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. The Linux kernel CVE team has assigned CVE-2025-40263 to this issue. Affected and fixed versions =========================== Fixed in 5.4.302 with commit 7bfd959187f2c7584bb43280bbc7b2846e7a5085 Fixed in 6.6.118 with commit 9cf59f4724a9ee06ebb06c76b8678ac322e850b7 Fixed in 6.12.60 with commit 6d81068685154535af06163eb585d6d9663ec7ec Fixed in 6.17.10 with commit 2d251c15c27e2dd16d6318425d2f7260cbd47d39 Fixed in 6.18 with commit e08969c4d65ac31297fcb4d31d4808c789152f68 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-2025-40263 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/input/keyboard/cros_ec_keyb.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/7bfd959187f2c7584bb43280bbc7b2846e7a5085 https://git.kernel.org/stable/c/9cf59f4724a9ee06ebb06c76b8678ac322e850b7 https://git.kernel.org/stable/c/6d81068685154535af06163eb585d6d9663ec7ec https://git.kernel.org/stable/c/2d251c15c27e2dd16d6318425d2f7260cbd47d39 https://git.kernel.org/stable/c/e08969c4d65ac31297fcb4d31d4808c789152f68