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 773FC3FADE8 for ; Wed, 27 May 2026 12:26:49 +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=1779884810; cv=none; b=fkGh2MfeFCFU8TlNHKvjsNf1St60MflBF2Y1C+Cl4FXnSUEQBuPxR5Sb/bsSS0JEDspwrMYr8GbSBEbRWUrvjTN5sfmAo4zS1122tanqmafY9d6h1rtNLuNvHd6HXCmOqI7lWDDSyWRIyddG678Dj86L1UrhLMcpGoEQ5KL75OI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779884810; c=relaxed/simple; bh=9l5ZhwV+SEqnA+bmMBoC/M80qz5LUrxlz88ISsIUB90=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=qe6WV0wIq/p2L700H2VN4+kGb8jzeeOFvHgwIGD3IopFRMoBslhhF3d6uBeYeDw45VQ/ERj2ni+oOyXHV+MyQbACl/+V8BgXNsd9FGafp+32WxO0+Cq71R4NqfbcHxcl7ykapVklin+BrRaERE/XItVzT/pnInn+/cyIqV/hTkQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2wGbLrWe; 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="2wGbLrWe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C93F81F000E9; Wed, 27 May 2026 12:26:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779884809; bh=okZXw3sw7GjjY/UOlZfI46dHdiS7U3J5TTDkiu2rNKw=; h=From:To:Cc:Subject:Date:Reply-To; b=2wGbLrWeHY+KE1ninkwH/l7BphPomi3t3VjmTMoxDg5Q3UkUt2AfRRGJg/nkeypoS mWJ0adPPskePi9xFQ0REx4LNqD5EpZd65PmU4F9X0pER4BP6llckRpPtEtM/vROVFL oS29ClvL/7LT4YNfWLtqWL3CTmikplbBKuAZ8ii0= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-45975: ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd Date: Wed, 27 May 2026 14:20:17 +0200 Message-ID: <2026052737-CVE-2026-45975-e0a6@gregkh> X-Mailer: git-send-email 2.54.0 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=2094; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=drd4XavoANBHDm/mxYbbmElePz1RnV4TkantPeJXb/g=; b=owGbwMvMwCRo6H6F97bub03G02pJDFliD2Vv3oqftXqfeswl/0e/73BLrjJXjVl86evckIzSe IGEq7kJHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRRcUM82P9DGtV5/vuvKe6 vrB84XX10x/OcjIs6O4Kbw2ZmLpS/lULS5SWRdu5+jktAA== 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: ublk: use READ_ONCE() to read struct ublksrv_ctrl_cmd struct ublksrv_ctrl_cmd is part of the io_uring_sqe, which may lie in userspace-mapped memory. It's racy to access its fields with normal loads, as userspace may write to them concurrently. Use READ_ONCE() to copy the ublksrv_ctrl_cmd from the io_uring_sqe to the stack. Use the local copy in place of the one in the io_uring_sqe. The Linux kernel CVE team has assigned CVE-2026-45975 to this issue. Affected and fixed versions =========================== Issue introduced in 6.19 with commit 87213b0d847cd300285b5545598e0548baeb5208 and fixed in 6.19.4 with commit ce63eda3e6d36e2c253febee1c8421ecbd1a680e Issue introduced in 6.19 with commit 87213b0d847cd300285b5545598e0548baeb5208 and fixed in 7.0 with commit ed9f54cc1e335096733aed03c2a46de3d58922ed 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-2026-45975 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/block/ublk_drv.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/ce63eda3e6d36e2c253febee1c8421ecbd1a680e https://git.kernel.org/stable/c/ed9f54cc1e335096733aed03c2a46de3d58922ed