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 E866C3EF67D for ; Fri, 8 May 2026 14:24:57 +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=1778250298; cv=none; b=EK53Mc/JAfLcyMTrogl32Aw+zs07LbL/j4CSrAyQxfLV2vSWmhewvxx+ivslYi72PCdPp4nfp3BUi2oeje+crKJfAqZeV2K2EqI2A+R6JH+9k+UZPmzmA5p+mRObDc3H6134Mpom2LWMKU0auk87OCRjt8XOltR8d1GR8K9l914= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778250298; c=relaxed/simple; bh=DrsHveu0QVokyrSNyee1pNxFzlqGRij82o7Azd1NIcw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=kv7y9T+1IljgDD2ScvzOKuNB82brzYbR5uDURDPAM82TapG9S/uwLksPU6eCy6aZZ1QVPwyP8ssuqXwa6Wmnq8MVP9JQtlzL5cRxlDFFD+hMO3+Q841mpTPw/8BI0ht1sdOUesrbRCFjzEFpUOLtn7VEQdp6mZUlfrAgUJh9T4U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=C22D3WGD; 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="C22D3WGD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7E8A3C2BCB0; Fri, 8 May 2026 14:24:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1778250297; bh=DrsHveu0QVokyrSNyee1pNxFzlqGRij82o7Azd1NIcw=; h=From:To:Cc:Subject:Date:Reply-To:From; b=C22D3WGDV2aeJZi8mnwG+LD2LnnnHdwrdo6F1wvXoisUI6axVOXa7Ag1UUOns6C2g ZB+zRKOjME3e38pFKOeXO6ojNHSuogqd3L3cfAcrRl7d0apVXD5bFMsnNFCujRnYdX KYEpvvRNtejEWSVGA+oTT5uL4KduIpMuWxJrvG6k= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-43390: nstree: tighten permission checks for listing Date: Fri, 8 May 2026 16:21:59 +0200 Message-ID: <2026050836-CVE-2026-43390-9540@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=1982; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=DU4TvzhDjYMM6ImZ/e43Yqh+rxGy1fpbtPsY3ga7bD0=; b=owGbwMvMwCRo6H6F97bub03G02pJDJl/PxaEr3Rtm723jPvl9/a1XLzNE6cKpjudfTo5QsGsK Ew3oe5oRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEzE5TfDPPXOI3dVvfRfFZfb Gv/7neOTkCvSwjA/KYPVQsw421Iv/1LCpilLzIP/ltoAAA== 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: nstree: tighten permission checks for listing 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-2026-43390 to this issue. Affected and fixed versions =========================== Issue introduced in 6.19 with commit 76b6f5dfb3fda76fce1f9990d6fa58adc711122b and fixed in 6.19.9 with commit 0abd81645fc95ec6a9d4e4813000f22c5efc0ff4 Issue introduced in 6.19 with commit 76b6f5dfb3fda76fce1f9990d6fa58adc711122b and fixed in 7.0 with commit 8d76afe84fa2babf604b3c173730d4d2b067e361 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-2026-43390 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: kernel/nstree.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/0abd81645fc95ec6a9d4e4813000f22c5efc0ff4 https://git.kernel.org/stable/c/8d76afe84fa2babf604b3c173730d4d2b067e361