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 B4E694EC66C for ; Wed, 16 Sep 2026 10:39:17 +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=1789555173; cv=none; b=CgnbR2+/p7DjDW68PKRbZGmM0V0bKa9hAD4n8jxQj0xequltY8NB7mAqCNHRZ8zISiBn9+a00p36l6/EOBPzFKH5fjKXWpnPgIUH5ewrmRPtt0Mz8vD7Tm+DpNo5xow7ZCpCscwuG1Rm/poFvgG5vmtZgU0HcJSlWRfa1jgEWwc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789555173; c=relaxed/simple; bh=H2IuqumDcU+0nmnbkU8KwKkFWlgdTArMmRs+0IU/LA4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=G0WxQiOlu7cPLjxcut/h7a5HSKnRRGFAq7nb64eIvOO2Nzmtj8rouRynYpEiPNHe7LUWLPMrbZ/6PVAqcMlrzvr96aNCEwwOFtt/CRDS26i0tNFXVU1VPAJVrRW1tVEcANwCt6zj8gsJ6VoLgIW0eNCS7ZfNP+Tc3/1oVR2pRiU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=E5FDGRJt; 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="E5FDGRJt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7BA9B1F00898; Wed, 16 Sep 2026 10:39:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789555157; bh=6s3ZanJvqg2ormfQo/XBsCnpXjIZgOnqeC/U/1P8VX4=; h=From:To:Cc:Subject:Date:Reply-To; b=E5FDGRJt02gDrItybigQ+1Kn1idSdEkCj1i+f8CI8kkTvQc5LMEjr1jwatPZqjOLC J+YizFgkWfTAFjaWRxX3ec7bimrLcVuji0hRBv1jtEkXsAz6Asw5GPfPoUZYf9FyEJ bNMoDdhN0f3+G6djHRlERHZlCUET42lTJyScc1so= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89922: KVM: s390: Take srcu when importing watchpoint data Date: Wed, 16 Sep 2026 11:30:52 +0100 Message-ID: <2026091643-CVE-2026-89922-c2ee@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=3176; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=K5KkGdLPOAKHbIOAuCRvwKFnZwzxx76Y4J7QCIsG9Mk=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmr8qcfnLV3zdGVr9fvVbOzDe5Pf8G8ePoV5fzzCtV6e YFLH0z70xHLwiDIxCArpsjyZRvP0f0VhxS9DG1Pw8xhZQIZwsDFKQATKetmWHCyZOq2gomrXvBF JLWd9lO6+PGG2k6GecY+i77N+VerffNmjgmv9eMl5W9eLgIA 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: KVM: s390: Take srcu when importing watchpoint data __import_wp_info() backs up the original guest memory contents of a watchpoint with read_guest_abs(), which is kvm_read_guest() and therefore resolves the memslot via __kvm_memslots(). That requires kvm->srcu (or kvm->slots_lock) to be held, otherwise a concurrent memslot update can free the memslots array under us once its SRCU grace period has elapsed. As this is not fast path, following lock ordering (mutex first, then srcu) take the big hammer and hold the srcu for the full import. The Linux kernel CVE team has assigned CVE-2026-89922 to this issue. Affected and fixed versions =========================== Issue introduced in 3.16 with commit 27291e2165b6de70c476b7b675308113edd69a60 and fixed in 6.1.188 with commit 6830fbc3724bf49c142aae69a4694f115fa9cedd Issue introduced in 3.16 with commit 27291e2165b6de70c476b7b675308113edd69a60 and fixed in 6.6.157 with commit f8e3a9997d5ecd56ebe4b262ff424516c068fecb Issue introduced in 3.16 with commit 27291e2165b6de70c476b7b675308113edd69a60 and fixed in 6.12.110 with commit 76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03 Issue introduced in 3.16 with commit 27291e2165b6de70c476b7b675308113edd69a60 and fixed in 6.18.51 with commit cc710ee45395efb4937e042960f791d33924e5f6 Issue introduced in 3.16 with commit 27291e2165b6de70c476b7b675308113edd69a60 and fixed in 7.2.5 with commit 4c05bf21d1806853e662cc19e744736a3408f155 Issue introduced in 3.16 with commit 27291e2165b6de70c476b7b675308113edd69a60 and fixed in 7.3-rc1 with commit a4e482def8533ebace517d9f67f1465841b1f982 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-2026-89922 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/s390/kvm/kvm-s390.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/6830fbc3724bf49c142aae69a4694f115fa9cedd https://git.kernel.org/stable/c/f8e3a9997d5ecd56ebe4b262ff424516c068fecb https://git.kernel.org/stable/c/76f5b4ea9ed0aa5a34bda9d8a878f2c73026ec03 https://git.kernel.org/stable/c/cc710ee45395efb4937e042960f791d33924e5f6 https://git.kernel.org/stable/c/4c05bf21d1806853e662cc19e744736a3408f155 https://git.kernel.org/stable/c/a4e482def8533ebace517d9f67f1465841b1f982