From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 58A8B38837C for ; Sat, 25 Jul 2026 08:56:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784969776; cv=none; b=FsWg3H2qDREMgMSqCm8WPQCM2lum86rhKEf2q3ZyilllE92h1sgCzeva+rGtWSQlkmzrvxD8McfclctffdCFBw2aV90Y8o0WfuaS2dbDrTxDNNvfuxhJRas4vstm+ipzwoInXbGoRnC1bpEOWIPEiwyKKaN2M8Yi03JtPPskxKY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784969776; c=relaxed/simple; bh=VOZAiF7sL+NUMOQaA3LSy1GXKxQrP8MjC10nRJmQX4E=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oN3+CxVXxZHwPouSYcJ9j6xI73FBGfFquA5V/meDNd8RqnP82NLFXFVIIjn0VZn46ooT90wG4Ijk1RxV04aljHXGc2LcTtbuz9cVvx2/kIMNhfl2xRpPS2PKcm0ubu1VDH0sVn3fUpeKkN4QeD0olP6gGxfSKecATozOs1ERbbs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2r1BjiDO; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="2r1BjiDO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB9221F000E9; Sat, 25 Jul 2026 08:56:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784969775; bh=P7abpSo/fvIc+Hdy9Lpu7ubZP3hfLAVRSj66jgLkuo8=; h=From:To:Cc:Subject:Date:Reply-To; b=2r1BjiDOWA9ckajKE4a/q3E2d7rSljJVwA27nrsTlbA0X5xRB+V9/IERzpwXCl2bS g4zGu6/dwrlgun8Et1ouNYAAUzjZgAM9fA9rWnjK6rx9NDt12NhTHFKR6l+cjlvmty Md6uCjD837v2Dhka62uON2coMQMIHWAf2GbRxCX4= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-64376: firmware_loader: fix device reference leak in firmware_upload_register() Date: Sat, 25 Jul 2026 10:49:53 +0200 Message-ID: <2026072524-CVE-2026-64376-efcf@gregkh> X-Mailer: git-send-email 2.55.0 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=3631; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=DV+5e85DJlDzwZBSOLpaS4h5knfrl4CYRATsq/iAbJk=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkpFRFvH22QvxqX4WRTMDPdwVR8T2VGnqTvek5t2ac/v H5W/H7ZEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABNxsmWYKyKqyHwqZX5W5+pd 5Xuf/9rNcCnwOcOC7Qc2H/g7hbl4ssV7k726nkwCfmI3AA== 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: firmware_loader: fix device reference leak in firmware_upload_register() firmware_upload_register() -> fw_create_instance() -> device_initialize() After fw_create_instance() succeeds, the lifetime of the embedded struct device is expected to be managed through the device core reference counting, since fw_create_instance() has already called device_initialize(). In firmware_upload_register(), if alloc_lookup_fw_priv() fails after fw_create_instance() succeeds, the code reaches free_fw_sysfs and frees fw_sysfs directly instead of releasing the device reference with put_device(). This may leave the reference count of the embedded struct device unbalanced, resulting in a refcount leak. The issue was identified by a static analysis tool I developed and confirmed by manual review. Fix this by using put_device(fw_dev) in the failure path and letting fw_dev_release() handle the final cleanup, instead of freeing the instance directly from the error path. The Linux kernel CVE team has assigned CVE-2026-64376 to this issue. Affected and fixed versions =========================== Issue introduced in 5.19 with commit 97730bbb242cde22b7140acd202ffd88823886c9 and fixed in 6.1.178 with commit 517676ec7dfca064e08f94007a4abd21969de0a0 Issue introduced in 5.19 with commit 97730bbb242cde22b7140acd202ffd88823886c9 and fixed in 6.6.145 with commit 46d403da376a8b7c1187193294953816e1a8d7fe Issue introduced in 5.19 with commit 97730bbb242cde22b7140acd202ffd88823886c9 and fixed in 6.12.96 with commit 2619b47a0c8114eef980a56ade7e3ef4b58eb384 Issue introduced in 5.19 with commit 97730bbb242cde22b7140acd202ffd88823886c9 and fixed in 6.18.39 with commit 92f41769e5fd16bcd9ba97500d0517332e0a5b45 Issue introduced in 5.19 with commit 97730bbb242cde22b7140acd202ffd88823886c9 and fixed in 7.1.4 with commit 15432f19562fdb9199cce6d9fc24db12c71ed574 Issue introduced in 5.19 with commit 97730bbb242cde22b7140acd202ffd88823886c9 and fixed in 7.2-rc1 with commit 896df22ee57648b0c505bd76ddbc6b2341834696 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-2026-64376 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/base/firmware_loader/sysfs_upload.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/517676ec7dfca064e08f94007a4abd21969de0a0 https://git.kernel.org/stable/c/46d403da376a8b7c1187193294953816e1a8d7fe https://git.kernel.org/stable/c/2619b47a0c8114eef980a56ade7e3ef4b58eb384 https://git.kernel.org/stable/c/92f41769e5fd16bcd9ba97500d0517332e0a5b45 https://git.kernel.org/stable/c/15432f19562fdb9199cce6d9fc24db12c71ed574 https://git.kernel.org/stable/c/896df22ee57648b0c505bd76ddbc6b2341834696