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 470762D839C for ; Mon, 1 Jun 2026 16:22:39 +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=1780330960; cv=none; b=BU8Xng8F3gF7FAd9yXhQmX8RgiKK0uLR/OHWWJ8ZE4PLG5iUcCTeEQhoeJzIKmsKGqFJQgGGn4pEI1TKCWdwhjd2BCRsGqApI3dMAfEbB59TjM3b58E7keaZORQjkJMe8KiggNp6ppUclDUs8AJONSGNMZj6XICNSw1Qtuimvmk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780330960; c=relaxed/simple; bh=ZHbJ7XqPPM6THNazYFl9xHvQbyORtGHC+4k0xEbkejE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=dD3VD2mt2Im6huZVLkVzEoe3bdto0VnFxjp8xQR+HIeOHZTkSRrSC5w5O59ZGXGX5AloE2yM5ckfU8P9rAYoceImJRngSKx7Vqf66uTLDV5rrE39FTdjLXysBDNFbJfkbMHyXZE65uizvp7+myKjilrrO3jAKdL24eMt77+7uds= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tOe6/G3g; 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="tOe6/G3g" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7F0331F00893; Mon, 1 Jun 2026 16:22:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780330959; bh=LAwpTaRnb8Y0rKBSlxFE59/03bIm+mLdq4ysiL5zMGY=; h=From:To:Cc:Subject:Date:Reply-To; b=tOe6/G3gbRzTZLnY0HljQRSH8kL3lu0fhQoUvo2m+r0nqPSJtQsNuLyPhBIluLa3T JH53Qag/6qtf2Zb5x1yfm25LcjvXbuRutqOP6yqM3pmMWTGTLu7pqC1s663IHd2ayL 7XiYZR8ggx/Uk5ChtKN9DxvuDP2jfmLOuGkpEOW4= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-46243: smb: client: reject userspace cifs.spnego descriptions Date: Mon, 1 Jun 2026 18:21:41 +0200 Message-ID: <2026060140-CVE-2026-46243-3d1c@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=3578; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=OU9nW/j04shJ4UKlHROyOvaWEs7EkDfn/fKSP/YycDI=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmyG6d+Cbseus3Oc950/S2llgc/VPzw+fqtfcYH5Rlr3 12cUPNcoyOWhUGQiUFWTJHlyzaeo/srDil6GdqehpnDygQyhIGLUwAmUnKbYUH7t5QV918kn3tS /Uh0e2lCun7DojMMC658nHPi/0u3bVZecmLTkv8ree94oQkA 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: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as kernel-originating inputs. However, userspace can also create keys of this type through request_key(2) or add_key(2), allowing those fields to be supplied without CIFS origin. Only accept cifs.spnego descriptions while CIFS is using its private spnego_cred to request the key. The Linux kernel CVE team has assigned CVE-2026-46243 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 5.10.258 with commit 7713bd320ed4fc3d08a227cd8e41242219a16981 Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 5.15.209 with commit 9544559e59438a4b609b2fdfa0763d8360572824 Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 6.1.175 with commit cf20038657d6d4974349556a34e08fe0490bebbc Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 6.6.142 with commit 2035acfb17221729b1b8ac335e941868a04ca079 Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 6.12.92 with commit a3bbda6502a9398b816fa2e71c9a3f955f58013d Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 6.18.34 with commit 91f89c1d83e80417629791fcef6af8140d7d01c8 Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 7.0.11 with commit 0aece6685fc80a8de492688ca2315fb86ec379c7 Issue introduced in 2.6.24 with commit f1d662a7d5e5322e583aad6b3cfec03d8f27b435 and fixed in 7.1-rc5 with commit 3da1fdf4efbc490041eb4f836bf596201203f8f2 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-2026-46243 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: fs/smb/client/cifs_spnego.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/7713bd320ed4fc3d08a227cd8e41242219a16981 https://git.kernel.org/stable/c/9544559e59438a4b609b2fdfa0763d8360572824 https://git.kernel.org/stable/c/cf20038657d6d4974349556a34e08fe0490bebbc https://git.kernel.org/stable/c/2035acfb17221729b1b8ac335e941868a04ca079 https://git.kernel.org/stable/c/a3bbda6502a9398b816fa2e71c9a3f955f58013d https://git.kernel.org/stable/c/91f89c1d83e80417629791fcef6af8140d7d01c8 https://git.kernel.org/stable/c/0aece6685fc80a8de492688ca2315fb86ec379c7 https://git.kernel.org/stable/c/3da1fdf4efbc490041eb4f836bf596201203f8f2