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 D15FF36B915 for ; Sat, 15 Aug 2026 06:20:07 +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=1786774809; cv=none; b=kmlOdKehRPk0uEfclGI55ZYWY2nHg5bWNtfoVoBrqCi3Tp96hg8d86FIs4mojg/zzYi16jPzkkF1RCFnr+wNUVdm7cwGxA9HXje+kVZFAtgMt4claJoU9QBjOoaap4hc8pF4H9HCYa9XKSSFZNjjRfNaFXTNLv4lTg1R+/N3Io4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786774809; c=relaxed/simple; bh=60XdqXa66M1Ase58lZqT8K5Dx035a6lq0d5uKpi+HXg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=ko+FjGsxTqnkBXg9eygURvobi1M7PG/yZ4laV7M4kDyejJZv9CFux687BO2f2iU0OIRB3hPo0F4gzoZ8KZZPKG9DrzLo5IS/404IxMo5luxkJUd+3KgZYdZ14SkA4qtSejo/mERmT4Gu+wlKDS5c06JPZ4qra009Z1jsiT0ific= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nhHEZr6e; 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="nhHEZr6e" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2FB461F00A3A; Sat, 15 Aug 2026 06:20:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786774807; bh=j5cyvqUr4RpFyt9CVp0oqnQblbD1c4d+2IE6nSovPXU=; h=From:To:Cc:Subject:Date:Reply-To; b=nhHEZr6eaGRWf6s+DZUO/UgkFFkZJHhyqVZMa3rS1fmqYdUcT7Ky3IUuMM7p1b0vI 6/B1TJHOeMa+bJLJSyt/16LtsIcSyKd7GLFVSKy1Ppy5UB/aoEjhcwTYIgsh5DOxoo zpfBBc7g3+s1wpDRuZtswbz2cCnGIAe/1oH9VysY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-72278: KVM: arm64: nv: Re-translate VNCR before injecting abort Date: Sat, 15 Aug 2026 15:05:57 +0900 Message-ID: <2026081558-CVE-2026-72278-d0db@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=2548; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=DGPg8vMU4ZkmccKXP9Xrl0o+TBad6Qkw0qiVDcT7ecA=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkNDNfiM/vyuqLk5bhWatnm1zOH2z0W9JxX5/6EK2y63 v71UVUdsSwMgkwMsmKKLF+28RzdX3FI0cvQ9jTMHFYmkCEMXJwCMJFTzxkW7CzXmvBo49y1K+yu Lezi1Nn3YAOLLMN877gNhYXfFNa7nrq47VnKvrl7lxz4AAA= 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: arm64: nv: Re-translate VNCR before injecting abort KVM faults in the VNCR page with FOLL_WRITE whenever the guest aborts for a write, similar to how a regular stage-2 mapping is handled. It is entirely possible that the guest reads from the VNCR before writing to it, in which case the PFN could only be read-only. Invalidate the VNCR TLB and re-fetch the translation upon taking a VNCR abort, allowing the host mapping to be faulted in for write the second time around. Interestingly enough, this also satisfies the ordering requirements of FEAT_ETS2/3 between descriptor updates and MMU faults. The Linux kernel CVE team has assigned CVE-2026-72278 to this issue. Affected and fixed versions =========================== Issue introduced in 6.16 with commit 2a359e072596fcb2e9e85017a865e3618a2fe5b5 and fixed in 6.18.40 with commit ea7a76d7d614b5f82b4d0785f9af3550e860a71a Issue introduced in 6.16 with commit 2a359e072596fcb2e9e85017a865e3618a2fe5b5 and fixed in 7.1.5 with commit 0a5dd8cf4d58ea28da132c2097cd1c525302ac48 Issue introduced in 6.16 with commit 2a359e072596fcb2e9e85017a865e3618a2fe5b5 and fixed in 7.2-rc4 with commit bb645aa0a4caeaf7f9cd32e9a948594d434c1a8f 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-2026-72278 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/arm64/kvm/nested.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/ea7a76d7d614b5f82b4d0785f9af3550e860a71a https://git.kernel.org/stable/c/0a5dd8cf4d58ea28da132c2097cd1c525302ac48 https://git.kernel.org/stable/c/bb645aa0a4caeaf7f9cd32e9a948594d434c1a8f