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 4F2153BADBD for ; Mon, 10 Aug 2026 12:04:36 +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=1786363477; cv=none; b=pKXtesOKcAAeCbAgD306VNpiPUYwoAeFYpKlE9mcK33JOhJ2vQjCyelNIOS/8Vz4iXV8NlgJ0/JZgIbI5+NfSzVisC+s+nE5+viB2G7CQZnmJc6H/r8KEuOZZ3XBIMKH/IDX2FIiMl8or+QO6d4gCCJW7CsKA1RR0hrut1kWaEA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786363477; c=relaxed/simple; bh=d2Bu472vB7dDL5xMX1Wq+reQ+UPTc6LBIaUtMteGIcs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=iklyciw8X6++Y9EL8LSdbAuQ/JkdHfBHRcJ+v6SbdyZtPDwdDJtNbWZbTamOumV/kVrD6Re7zSXVxmL3XFaU992Ein3vr4G+jTLoa+aVvhGROnE5yGUPvfq8OfLO5p9w92US6RH1y8cxKqbTObaaa7voBk3quOmTo1d8nWFbnz8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2ZD4XvwT; 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="2ZD4XvwT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C81641F000E9; Mon, 10 Aug 2026 12:04:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786363476; bh=ggrHTD5vznx10KT0jX/9n4+rD5A6mqqGkATot4Mwnsk=; h=From:To:Cc:Subject:Date:Reply-To; b=2ZD4XvwTrb3KtXBW/+wTGz6bD4ENslFxCVRcN0ueGBaVaoGOs4l9KZEQAAoCz17km QckNbLTMsyl8nOEG9SyyMmjFsIH68SihBQupZZM9f9pmowLAMd3M04iWXMH12iLipU GH2dgZKNVKJoTbKx63VhHPh+6rByKxFQ2rD4AN9w= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-68178: misc: nsm: pin the module while the device is open Date: Mon, 10 Aug 2026 13:58:15 +0200 Message-ID: <2026081007-CVE-2026-68178-3eb4@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=2882; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=Ugp8EX+f40+b3M9pHJ7AzQB03RA/+vJL4M0B7P5St/M=; b=kA0DAAIRMUfUDdst+ykByyZiAGp5vJOh3w5ley+XviHys04BjKw5PJT5baf/CJhDUSm0h3Q5n ohcBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmp5vJMACgkQMUfUDdst+ylPGgCfRIaU n2S4BMidfsu+3kOdnNyUZeEAl2UgbQUaOTkZ3jsNRpHL4SPqNro= 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: misc: nsm: pin the module while the device is open misc_open() installs a misc driver's file operations with fops_get(), which pins file_operations::owner before replacing the file's f_op. The NSM misc device leaves nsm_dev_fops.owner unset, so opening /dev/nsm does not take a module reference on the nsm driver. If the driver is built as a module, an open file descriptor can therefore survive rmmod of the module that provides its ioctl callbacks. A later ioctl through that descriptor can call into unloaded module text. Set nsm_dev_fops.owner to THIS_MODULE so the misc core holds the module while any /dev/nsm file descriptor is open, matching the lifetime expectation for the installed file operations. The Linux kernel CVE team has assigned CVE-2026-68178 to this issue. Affected and fixed versions =========================== Issue introduced in 6.8 with commit b9873755a6c8ccfce79094c4dce9efa3ecb1a749 and fixed in 6.12.101 with commit 1996639f824ce9468395cdb7bcb8f467fa787e77 Issue introduced in 6.8 with commit b9873755a6c8ccfce79094c4dce9efa3ecb1a749 and fixed in 6.18.42 with commit 1da310b94504d42001e9c32c43c5dc105b777e5f Issue introduced in 6.8 with commit b9873755a6c8ccfce79094c4dce9efa3ecb1a749 and fixed in 7.1.6 with commit 9e9a82d00c3d10129fc310a7547b24a679d5d920 Issue introduced in 6.8 with commit b9873755a6c8ccfce79094c4dce9efa3ecb1a749 and fixed in 7.2-rc5 with commit 3b231f1e9990f4c21220d0a69733ce2105891ff9 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-2026-68178 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/misc/nsm.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/1996639f824ce9468395cdb7bcb8f467fa787e77 https://git.kernel.org/stable/c/1da310b94504d42001e9c32c43c5dc105b777e5f https://git.kernel.org/stable/c/9e9a82d00c3d10129fc310a7547b24a679d5d920 https://git.kernel.org/stable/c/3b231f1e9990f4c21220d0a69733ce2105891ff9