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 A94D057D239 for ; Wed, 9 Sep 2026 16:19:55 +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=1788970797; cv=none; b=HxDommfwh6UzPAkFE7h3csf78KLDN8ru5FrhqfXKkkc3uZqJYa0485Fx/QbKxT+kNpf+LfMrd9uZ5RcNNS8F24u38U6nYLqzyyyp5zXMeH6Y3+08wYf9LX9zzNa+l7DsaAl1hSiPQ2gubeXM1nCqk+f+ORIAyQtAdedHf7Mgw4k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788970797; c=relaxed/simple; bh=Sr0sJMAlTNCqxrMmVr8xMK796DUDXs8ZxaKMc2FehIg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=hWp72F5O0OZ0rfg3F9rgMvCJQLbreYFmJOB7i9rmgyq3wyG6Xxwr0C8NBmbjzcmtV5vDkc8iZd+vbHvOl4OY4Y+HnBOmnjjhpy07w9J3rGM7Id6i0qv4BZUOMSN5KQH3a5dzVB0Biq8HwvdKrQaHg4a5srmfYKApj7szoHPjMok= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Xfbegi+3; 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="Xfbegi+3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B5CE51F000FF; Wed, 9 Sep 2026 16:19:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788970795; bh=fAxa+CuzGb5idbTVJhBMTrTLeymQfisnoK+FEBZ87P8=; h=From:To:Cc:Subject:Date:Reply-To; b=Xfbegi+3aYIuwvcvzm8zjfQRkxAXqUwfKpkXj3KnBQm13YgZxqGhxzjUhVUuCSZHL Ha098uz6xViN+KBUM3G1obPa6STxMtjPBNKZfb5itUmbiJ9Vs9zSq3kuiIUcu5B7Dj GXcNlrwZ5rH17Nz4fnsLAcheTf9MYZfZ86jAm0Qk= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-80921: KVM: s390: vsie: zero stale crypto bits Date: Wed, 9 Sep 2026 18:19:43 +0200 Message-ID: <2026090942-CVE-2026-80921-0e26@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=3627; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=vjcNq0XoFwDo99yhBCtgWQSH6rhxNs3ZtMAaH4Lnzyk=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkL2+U476bcX85zqJhTM+6q+Iu/S6ylGrqWCchLvZ6R9 GLX0lWqHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjARp3iG+f7esyt0j6XEyOw4 rWVSX+9l/HOqPcP8tEflIv3Hdv/c90b+fNORe7t+VHcsAQA= 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: vsie: zero stale crypto bits When shadowing crypto access bits from a format0 apcb (crycb 0 or 1), the bits 64..255 are unchanged from whatever is in the vsie page in the crycb and thus in the apcb. This gives a nested guest potential access to a device no longer available. Zero out the remaining bits. The Linux kernel CVE team has assigned CVE-2026-80921 to this issue. Affected and fixed versions =========================== Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 5.10.269 with commit d110b3297f11ef227098b8a82ade2d5f123b7d2f Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 5.15.220 with commit 59d51550b5cb916bda037673a721a404b3b47a0d Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 6.1.187 with commit f6079dca67eccb5eabef9f72437948c66dc5131f Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 6.6.156 with commit 087c19cc60a8caa1a08e1e434c8be2caf6c27733 Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 6.12.108 with commit 7d23489f51109e3ebba5b5db8c5f0185af7b7fdf Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 6.18.49 with commit 935eeba276012916c76243e5cbb843efd8fdb75d Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 7.1.13 with commit d4bcd2df6d0d2af916b4fe1a533958778ea7c45b Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 7.2.3 with commit 29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6 Issue introduced in 4.20 with commit 6b79de4b056e5a2febc0c61233d8f0ad7868e49c and fixed in 7.3-rc1 with commit 34d5b5b646c91cfb9338d7a12c955a70ffb8c66b 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-2026-80921 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/vsie.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/d110b3297f11ef227098b8a82ade2d5f123b7d2f https://git.kernel.org/stable/c/59d51550b5cb916bda037673a721a404b3b47a0d https://git.kernel.org/stable/c/f6079dca67eccb5eabef9f72437948c66dc5131f https://git.kernel.org/stable/c/087c19cc60a8caa1a08e1e434c8be2caf6c27733 https://git.kernel.org/stable/c/7d23489f51109e3ebba5b5db8c5f0185af7b7fdf https://git.kernel.org/stable/c/935eeba276012916c76243e5cbb843efd8fdb75d https://git.kernel.org/stable/c/d4bcd2df6d0d2af916b4fe1a533958778ea7c45b https://git.kernel.org/stable/c/29b4f7bc2991313bd3e6f6fb8fdf1b173f086dd6 https://git.kernel.org/stable/c/34d5b5b646c91cfb9338d7a12c955a70ffb8c66b