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 C68EE371D00 for ; Tue, 9 Jun 2026 11:52:38 +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=1781005959; cv=none; b=BjGU1q2+RBzPHdIDSmpBpr1uM7SvNn+0hvlu3s149iO1EBapBLaZ6askfLjlAO2igcTt+V5maemcCJfRnF4tOQqAZvT0fx+xKqFm5SzmTx/Ewk1oUDh1HB0YbNAeHn7SbVvyDEvAtRPQd4ifCf/TGdl3SCKD/szE3Wb7ZWyDU7k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781005959; c=relaxed/simple; bh=r0hUBrVFjYxQ27VIeFOUJ+N57greHvruQoEDatZwfOo=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=BsnvY/3q8OlYDg2LYy8Qs+eY2KtsTvC9HF+Ibm97twoDNAv8zG1VmoF1oJTCyYU+dTXa3CcdSXfaJcJY+oKldexfxdR9+4am6SpITogBCi9kWGEilOrvwxXEL77EiE+YbAHS1d6vJv+RJqbBK+GuV6ayeBf7GY5Q52fdHemd2MM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Sg4btvq5; 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="Sg4btvq5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C25771F00893; Tue, 9 Jun 2026 11:52:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781005958; bh=fGFNADcMrTULeh2B+UFcD7/lcUWmxiFzwcRr7xzwZi4=; h=From:To:Cc:Subject:Date:Reply-To; b=Sg4btvq5v9atknoLHHOFipFsyPX+7IAIlxp7WjFzcG7igssrLJSCWVxdew+jG73em TueoADMQnk+C2W1vIXyuM0r9pmFreZt79nKqz+mgzQiMhJ+jR7NOuQA/g5rjLV7VWO +GmV8NeHiLmhdkufBTMOiUxnRI9mQP0FBFh+5k9Q= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-46317: KVM: arm64: Reassign nested_mmus array behind mmu_lock Date: Tue, 9 Jun 2026 13:51:38 +0200 Message-ID: <2026060938-CVE-2026-46317-e13c@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=2572; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=slY6d7EF8XPGFfW+tHaO6WxIgXs0py7cvcAhQ+CFLHA=; b=owGbwMvMwCRo6H6F97bub03G02pJDFnq/7z2vPTxjfKNl9TceGDfZ2HDZd61fP43Fs39uE247 sbU6bvMOmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BWAiLbIMc2VDnHqMhbx63Z7v FzigEfDg+E8/DYZ5WlqvC8wtzAvmhmydYzYj90fk8wOrAA== 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: Reassign nested_mmus array behind mmu_lock kvm->arch.nested_mmus[] is walked under kvm->mmu_lock, including from the MMU notifier path (kvm_unmap_gfn_range() -> kvm_nested_s2_unmap()), which can run at any time. kvm_vcpu_init_nested() reallocates the array and frees the old buffer while holding only kvm->arch.config_lock, so such a walker can reference the freed array. Allocate the new array outside of mmu_lock, as the allocation can sleep. Under the lock, copy the existing entries, fix up the back pointers and reassign the array. Free the old buffer after dropping the lock, as kvfree() can sleep as well. The Linux kernel CVE team has assigned CVE-2026-46317 to this issue. Affected and fixed versions =========================== Issue introduced in 6.11 with commit 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 and fixed in 6.18.35 with commit 918450ad6010df6ecd2efde12a1409e011da22d6 Issue introduced in 6.11 with commit 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 and fixed in 7.0.12 with commit 4424dbcb06d68e34e51c019a5781a7dc00731971 Issue introduced in 6.11 with commit 4f128f8e1aaac189f83d0f828bcdb2986d8d2e51 and fixed in 7.1-rc7 with commit 70543358fa08e0f7cebc3447c3b70fe97ad7aaa8 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-2026-46317 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/918450ad6010df6ecd2efde12a1409e011da22d6 https://git.kernel.org/stable/c/4424dbcb06d68e34e51c019a5781a7dc00731971 https://git.kernel.org/stable/c/70543358fa08e0f7cebc3447c3b70fe97ad7aaa8