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 E5C6A314B9A for ; Wed, 24 Jun 2026 16:35:35 +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=1782318936; cv=none; b=suWy89Gu8fvUHgTbjpw+Pr98KcAGt2HtkXbU9y0conn0R7NESLKEGcVvvHf3BNjYPzoSsW4imTkXfN0neqlPuIxBsF4beEJWnETCb9iGWyXTLbJOKDCeaaC8DPxAlhb4AAEeGwgPlEIQ7oLeChzE2IM6mlqLtE8awCBVPHwf3Ec= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782318936; c=relaxed/simple; bh=KcHPCakKeQfiD/X3kXvN6tnjcAWBEHm4UdQpvh8ii8w=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=t/G/s52uKmSqr0I6T2byFxtve2l5d/dEjk6tuaf2TVes+IbmBdBi0TIzyFyh375O5le51RhQtiEyIw+YkgzvrrjoKHENpZmPdi7BEnomZAlxr2s1Z5fSI/tX98gF3FrtT0cfYZKcPGc6HtTn8og513zaZL2sJGsYPNyAHPsnEtM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=pJ+n8EFC; 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="pJ+n8EFC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3762E1F000E9; Wed, 24 Jun 2026 16:35:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1782318935; bh=NncvDrrxUq+v8Iv56Y/D9Jq4UKRWMWf3AsjnkOv5Oco=; h=From:To:Cc:Subject:Date:Reply-To; b=pJ+n8EFCYH/npwzljDBBEYHMKODIhRlxFHsnmCCNIikqX/JSgaG18DmzO+r2rIdw9 bQCOvgdguacVMZ+NNfUx5NQhNwdTb7EwstZE0p4tvjuE8pX0P1EYq8Z2HRlP5qhKa4 hinp7GrPAXFMxW0BEmRvVXBzlgB8TFVSVCArSmoc= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-53020: um: Fix potential race condition in TLB sync Date: Wed, 24 Jun 2026 17:30:44 +0100 Message-ID: <2026062452-CVE-2026-53020-6e28@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=2002; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=uV/A05jlesvp/eFZGYZ2HXvU6/DMZD6MjMvMTbBR8W8=; b=owGbwMvMwCRo6H6F97bub03G02pJDFk2bAxpJzUftEqYro1LfutwujW59tIWrbM9KkvcTP79i A5IW+veEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABOZJcEwT5Gv5dSf1FWON835 XdudG5ZKyTboM8wPXtUzu2XrWcVmI2H7MI+T/0qifdcCAA== 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: um: Fix potential race condition in TLB sync During the TLB sync, we need to traverse and modify the page table, so we should hold the page table lock. Since full SMP support for threads within the same process is still missing, let's disable the split page table lock for simplicity. The Linux kernel CVE team has assigned CVE-2026-53020 to this issue. Affected and fixed versions =========================== Issue introduced in 6.19 with commit 1e4ee5135d814fe4785890790cec81c3132888fb and fixed in 7.0.10 with commit f21c343ec7419377bff89ab11146c03ae117036f Issue introduced in 6.19 with commit 1e4ee5135d814fe4785890790cec81c3132888fb and fixed in 7.1 with commit 102331b66bcaf1f41f50b9c4cd5c36e46bafa9f3 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-2026-53020 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: arch/um/kernel/tlb.c mm/Kconfig 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/f21c343ec7419377bff89ab11146c03ae117036f https://git.kernel.org/stable/c/102331b66bcaf1f41f50b9c4cd5c36e46bafa9f3