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 C381A5013B1 for ; Wed, 16 Sep 2026 10:38:46 +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=1789555139; cv=none; b=SD/42Fx4xMalGLNoAl1mHETBCKgeKDSbjujotKsSYAuHl54WnDKVoD4M+SkdeS1u7kIfmSsUZ0HMEJ4X1tWaiFKwBvYRUMPSEynEQoeavpM0rumvdAwxPTRNNgH6UN/5ptEf2nJWAV/q64PQpZq2z976Nrv6dGdeVZ/CDxAOoEc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789555139; c=relaxed/simple; bh=ssJ6BhDetVTFPYQuWnQFDCC+BzJqzcjNtJugu4m2gSY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=mny1HVqt1vJ2ZbrnF0wdkqam78FqVuMMkO0kee+xndqHD/rz3xEKBTL10DhoK8A0GnOvb+0WCOUGXb7+HJreI9Q/tMgKkFjO6b+cv1mrv2NPhTYkGL1otMwsRPWOrrNXRQYOF4a7elZxw1FDP5FIQa7AztvBjXYQAXR1GS/3u8o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PfKKqmvk; 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="PfKKqmvk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D7C21F000FF; Wed, 16 Sep 2026 10:38:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789555123; bh=zZT3zLzpRCbOHYdU+i+7pLjfSzyLHEH3+PYcit4T0Y0=; h=From:To:Cc:Subject:Date:Reply-To; b=PfKKqmvkEImsYgENW05euUZTSnQXEwhqC5oIa/I3ldeumTcbrO68wLFgKGqbKGrM/ pd0KSjfVfNolg4Zr65ACJx5S+Q+OMa1gVamVqSdbvOqwVStkdqzYZuYx0KmYpBUVJp sPfthZQlEC3sMpaeuvRnu4ODax3YcHPfNRolLMD8= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-89912: KVM: arm64: vgic-its: Don't dereference a NULL collection on ITT save Date: Wed, 16 Sep 2026 11:30:42 +0100 Message-ID: <2026091641-CVE-2026-89912-dbe8@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=2695; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=EjXqjhN834sjRdJ7vQz5qB8eEZBhygUDVVH/ZsLma9M=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmr8qfeXmk/I/HJ4bTwY/MEph1xYWmf6vP/YHqNTNYxx 1lyKX8yOmJZGASZGGTFFFm+bOM5ur/ikKKXoe1pmDmsTCBDGLg4BeAmdzEsODRtB8fyyGIZkWwu teo3h36sEPwuw7Bgy4Um8fuBnsKWzJax23L+mO5OuPMeAA== 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: vgic-its: Don't dereference a NULL collection on ITT save MAPC with V=0 drops ite->collection but leaves the ITE on the device's ITT list, and vgic_its_save_ite() dereferences it unconditionally. A guest that issues MAPD, MAPTI and then MAPC(V=0) therefore oopses the host when the VMM issues KVM_DEV_ARM_ITS_SAVE_TABLES to migrate it. That sequence is UNPREDICTABLE per the architecture, but KVM already handles the resulting state in the translate, MOVI and DISCARD paths. Save a zeroed entry, which vgic_its_restore_ite() reads back as invalid. Skipping the ITE instead would leave the ITT slot holding whatever is in guest memory, and restore rejects an entry naming a collection the restored collection table does not have. The Linux kernel CVE team has assigned CVE-2026-89912 to this issue. Affected and fixed versions =========================== Issue introduced in 4.12 with commit eff484e0298da5a4d18ca82f5454c557fd942af5 and fixed in 6.18.51 with commit 3d4c26b16a04a084fe0bde08ccdd8086570f8bbe Issue introduced in 4.12 with commit eff484e0298da5a4d18ca82f5454c557fd942af5 and fixed in 7.2.5 with commit 36df368861d2664291298feeb37dfef43fcae670 Issue introduced in 4.12 with commit eff484e0298da5a4d18ca82f5454c557fd942af5 and fixed in 7.3-rc1 with commit c6c156d931c33b92362383cf76f6d6e1291dcbfe 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-2026-89912 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/vgic/vgic-its.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/3d4c26b16a04a084fe0bde08ccdd8086570f8bbe https://git.kernel.org/stable/c/36df368861d2664291298feeb37dfef43fcae670 https://git.kernel.org/stable/c/c6c156d931c33b92362383cf76f6d6e1291dcbfe