From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 F366F361667 for ; Fri, 8 May 2026 14:24:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250252; cv=none; b=Iit+S27nOKWU0Q1pguUlEiw87zXjiDj+UHwP2JCvNv430aB9zis++7/L2Wq+zu9IJOVa98KLU2DmmRpigE46ENhF1cbET9hBvFt8UuLHJuaZteINFNuxn/dLKhppdXIlEh03LpIxCd5KpeAzyWJmeoUDOk+TxS6vJ7axtHsWh84= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250252; c=relaxed/simple; bh=egyrVreIyJ0xTqNbqLWNUny8iUTvr8g4eLy7HmmeR/A=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=pbH9LhL8kXP3tJqt+wB8ADgVGFCpykIgkKjwhqdZ4Zo5R/N3huwj5kLqeUnKFc6Hzp1n0iAWNJX6L2aOW+rq7JRVUl4Iwm/4r52wMWRqG5OdsLOLkbxyKzEVySFgSJTLBWZGxpg2nYtwXSaerBRkE4C9Dq6o0+k5U0dFUpUi05g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=w2eghSd1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="w2eghSd1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 471EBC2BCB0; Fri, 8 May 2026 14:24:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250251; bh=egyrVreIyJ0xTqNbqLWNUny8iUTvr8g4eLy7HmmeR/A=; h=From:To:Cc:Subject:Date:Reply-To:From; b=w2eghSd1CPDwQP1uGB3T4z3lWQWgxBcd5Q713aKAPG+l6joDYncthcePnpv9STtyy LlT1Ocridi6Ejiy1ZtMlz+3FyvIVANyaF9rQLyvtqVm0+sNFpw2/oDQt68WVPmb/6y MEAAudZwEr46kDfdGGTdZPXNUGv8+7NzdjHS7lKI= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43403: nsfs: tighten permission checks for ns iteration ioctls Date: Fri, 8 May 2026 16:22:12 +0200 Message-ID: <2026050840-CVE-2026-43403-3869@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=2492; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=iGzlyQdp5+RPPULxTH++0ZeQFFLG3pO7UfaLSmpEB7k=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/P5aWxtV1rl4rfqyEJfgmuwFvJUvTNPnorxfZl14xj I+dKqrYEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABM5584wv6Ddwmf+wUr91G8p fxv8Pacnv5nhxjDP8OEREa57LkzVxnen/0m5N2Ez60tlAA== 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: nsfs: tighten permission checks for ns iteration ioctls Even privileged services should not necessarily be able to see other privileged service's namespaces so they can't leak information to each other. Use may_see_all_namespaces() helper that centralizes this policy until the nstree adapts. The Linux kernel CVE team has assigned CVE-2026-43403 to this issue. Affected and fixed versions =========================== Issue introduced in 6.12 with commit a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 and fixed in 6.12.78 with commit 3376b345df155ca36d8611857b41ff7d5183fc38 Issue introduced in 6.12 with commit a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 and fixed in 6.18.20 with commit 2f3dea284c761c890d676f77d5e55c0c496b4ef4 Issue introduced in 6.12 with commit a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 and fixed in 6.19.9 with commit 0ad650e60150eda789deca5e78a6a09d26bf8fc9 Issue introduced in 6.12 with commit a1d220d9dafa8d76ba60a784a1016c3134e6a1e8 and fixed in 7.0 with commit e6b899f08066e744f89df16ceb782e06868bd148 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-2026-43403 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/nsfs.c include/linux/ns_common.h kernel/nscommon.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/3376b345df155ca36d8611857b41ff7d5183fc38 https://git.kernel.org/stable/c/2f3dea284c761c890d676f77d5e55c0c496b4ef4 https://git.kernel.org/stable/c/0ad650e60150eda789deca5e78a6a09d26bf8fc9 https://git.kernel.org/stable/c/e6b899f08066e744f89df16ceb782e06868bd148