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 9FF593EF67D for ; Fri, 8 May 2026 14:25:00 +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=1778250300; cv=none; b=gSSxnK3uTLDhIkoB0jqzLZzonN+SNP4LKwOH2QTbzMcBdWGELpD/CIyfZ7USOQcx5nMCohBwHWKOeukO1OhCCcP/Wj3qzr3v0zfjhW+xlwiQtC1Fn0MyvYsHSoYOWNQQhmeni7PKNsuznQRZzreQlKSHZtRPjz9hXn2MrV5lqmY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250300; c=relaxed/simple; bh=r1ZpERczhtHBAQzFb/Qnu9JHaAY8DLqx987fr4AOLMs=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CQpZXxW33hRcPCBbeaoWve83drWp8Dmx887whaF9f8CRnO5S3V+oNkFEFnpZYHuoucCBnM4affYISwLDCt/E6bcdf0xLnw/oivr1zTjGU6bEIdQdKhaPYpLDzQkXXagMyMy33CZOuvLRJ4z5tPFrPw5RE0GKeNg9LTzQeCZe0fk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jZCknwhU; 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="jZCknwhU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0DDA6C2BCB0; Fri, 8 May 2026 14:24:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250300; bh=r1ZpERczhtHBAQzFb/Qnu9JHaAY8DLqx987fr4AOLMs=; h=From:To:Cc:Subject:Date:Reply-To:From; b=jZCknwhUDzKmwtqOPRzTALFU5DSL8E5TUbTZ7o62DdIU3pCnRa58Axcpl3oGClZKp 8VZYdXfG6IIMtqnKAI+1gnRogDd0XX4fQ59CT+5DIrvtCbavk5AvpWrjpEgZbhreoI EGb/C2ns+/wM2PVy9lYYSOWKvJ2eFAa8A0StkLhk= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43391: nsfs: tighten permission checks for handle opening Date: Fri, 8 May 2026 16:22:00 +0200 Message-ID: <2026050836-CVE-2026-43391-4889@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=1981; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=pJOgxuC90v2EucMcM7t8tJzusK4SZcm8wsl1hoT6pPc=; b=kA0DAAIRMUfUDdst+ykByyZiAGn98XChRdxs/s7N3FPgfaGJlXa2nN729vBcTbMt+SEw2H/Fq YhdBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmn98XAACgkQMUfUDdst+ymXEgCeI4S7 1cq1KHtA8JQLabOWCt7PcT4AoLSbMxLsotvvRIUjVbrHxzKUotJ7 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 handle opening 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-2026-43391 to this issue. Affected and fixed versions =========================== Issue introduced in 6.18 with commit 5222470b2fbb3740f931f189db33dd1367b1ae75 and fixed in 6.19.9 with commit 1797ee11451f1b2be69863a9f5bd43b948813fdf Issue introduced in 6.18 with commit 5222470b2fbb3740f931f189db33dd1367b1ae75 and fixed in 7.0 with commit d2324a9317f00013facb0ba00b00440e19d2af5e 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-2026-43391 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 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/1797ee11451f1b2be69863a9f5bd43b948813fdf https://git.kernel.org/stable/c/d2324a9317f00013facb0ba00b00440e19d2af5e