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 4CF3020E334 for ; Wed, 12 Feb 2025 13:28:12 +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=1739366893; cv=none; b=j8gyJw1m4s2KdNyz6p/NwDqU0D71CwcfKOUY5gu5Igk3D8AwSNWPbdMQK1ub+9PEK6URS5r3Ao1jgFOv0XA+fVP76lR1G77TRS/JHXZXgCjBv5SonO2c4/5DqPGlA7ze6dkLrmLF/E1DB/Fe4NU1D9cy+N2LCj2u5S7V24uCqs0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739366893; c=relaxed/simple; bh=R9PIfC7iTIe7guWp8dDg3MudarJ3L3tf2HVZJNDhC1A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=qlCOj+X4NvbeKzYQNCT6WA57eGGc2R02o1drLtg96NpVkGGjAy0EUFj5TQu4eOUcLwT/llz+f+phr2Z/OrMmo5yfuYO3C7pJ74SQ6SC2yBmF36OvtxC6i3L4Tei0U7IDLIZEi9icunra0qBvWyTghqbhM30s0NX+o/aKxS+i4kU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QTJRTWSO; 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="QTJRTWSO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 54797C4CEE8; Wed, 12 Feb 2025 13:28:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1739366892; bh=R9PIfC7iTIe7guWp8dDg3MudarJ3L3tf2HVZJNDhC1A=; h=From:To:Cc:Subject:Date:Reply-to:From; b=QTJRTWSO6EOScB8+3NwarsCixuRaFqLpc1CGRlVwKz9hXRtM3A24l/TQtIW9tK5qG yXJ10duIEI28sgRnfPsM3tsmk+8hVL9sMnlV/YYZ0VPXxVmLvWgOmoRTxXqRUlkzD0 KRe8Zy426TmdSBqSEK01XgbCxj/DcPpK7L5NPduc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2025-21695: platform/x86: dell-uart-backlight: fix serdev race Date: Wed, 12 Feb 2025 14:26:59 +0100 Message-ID: <2025021259-CVE-2025-21695-ca7d@gregkh> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=2534; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=R9PIfC7iTIe7guWp8dDg3MudarJ3L3tf2HVZJNDhC1A=; b=owGbwMvMwCRo6H6F97bub03G02pJDOlrFi5m91ysIHjlWPORp6X8yf0fF+SXL++pUBSSn9f+I GT+n8jnHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRV1UMCzqcBfcxrvSoC4zT 6Ovw54/4ued7NsM8E6avSzbo6/2zFn41m2En+738VX4SAA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: platform/x86: dell-uart-backlight: fix serdev race The dell_uart_bl_serdev_probe() function calls devm_serdev_device_open() before setting the client ops via serdev_device_set_client_ops(). This ordering can trigger a NULL pointer dereference in the serdev controller's receive_buf handler, as it assumes serdev->ops is valid when SERPORT_ACTIVE is set. This is similar to the issue fixed in commit 5e700b384ec1 ("platform/chrome: cros_ec_uart: properly fix race condition") where devm_serdev_device_open() was called before fully initializing the device. Fix the race by ensuring client ops are set before enabling the port via devm_serdev_device_open(). Note, serdev_device_set_baudrate() and serdev_device_set_flow_control() calls should be after the devm_serdev_device_open() call. The Linux kernel CVE team has assigned CVE-2025-21695 to this issue. Affected and fixed versions =========================== Issue introduced in 6.10 with commit 484bae9e4d6acb5eec39e1ea47f9aa43f11b154d and fixed in 6.12.11 with commit d3a24d923333f75aaece9acb051d676edc0afb75 Issue introduced in 6.10 with commit 484bae9e4d6acb5eec39e1ea47f9aa43f11b154d and fixed in 6.13 with commit 1b2128aa2d45ab20b22548dcf4b48906298ca7fd 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-2025-21695 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/platform/x86/dell/dell-uart-backlight.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/d3a24d923333f75aaece9acb051d676edc0afb75 https://git.kernel.org/stable/c/1b2128aa2d45ab20b22548dcf4b48906298ca7fd