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 E522A3A257E for ; Fri, 19 Jun 2026 14:43:41 +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=1781880222; cv=none; b=gBloSoOTxY9c8BFD8BDFsNPm8mFJbPrx40+WnaDNNuS7TTi5agXKix1LgVEy3hhpMutjXplt1FhGhlqOKRshyUSrzXz85sMrxOgR2FAncZv4yoWXFZcVu5oMUoKB8l8hpUKU7MF5aP+InvPGnOcnYzLOdlUARfMfM5ttf3mb/x0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781880222; c=relaxed/simple; bh=FsA9JaJC57ppCFTaqqb01fkluvyCYQHtiei+gcezdTg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=liSO/McbjW0uW5Q9twMWzhnL07dAt9NftpS0cINsLN2be60Oi82G2GSMDOjPVPNB+D/XQb8Upa5QQswH+fzTtBz1LKw14IpCakQ6FsoekC7eSqjrDA47ZVK5vWgP5vFMJHHBBy7qQo+9xHTCjWsVtCH5lMhxsKveHvbz4WjCBRo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bjZhRirL; 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="bjZhRirL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3562A1F00A3D; Fri, 19 Jun 2026 14:43:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781880221; bh=ceZANw1rubfNCOapujZeugU5dmxq4pGnmPvfv+drXzo=; h=From:To:Cc:Subject:Date:Reply-To; b=bjZhRirLHrX7gj9bSf4TLxa1024Pyx4Nh/t8mPCISUHCshIEOOeNevIFTAtuzs60O btyY7Y6mUixj2y/fv5qRAblBzAkctPVu0bV7lrn95ACTD4E3lMrOTLtWw5sc9rfx+O 2lR+vJn1LyGnfCsQxIOwOTMPHQvDTv5X4Qrg9K/A= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-52909: ip6_vti: set netns_immutable on the fallback device. Date: Fri, 19 Jun 2026 16:42:34 +0200 Message-ID: <2026061933-CVE-2026-52909-253f@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=2340; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=WcnTz3sMzHpGW2yM+yyVxOok3BRoYBac6Zc/ISmLBts=; b=owGbwMvMwCRo6H6F97bub03G02pJDFmmoVF58tZOFQzq54Oe5R+SXKPebltdc3df2iKZM19Uf GZ5TZvcEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABPJY2GY71RzSGXx7q0vGusk w6brSU/hX/PtG8P8Ci+Dt/6m1xPUfqjFMV+dPMfsoMd9AA== 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: ip6_vti: set netns_immutable on the fallback device. john1988 and Noam Rathaus reported that vti6_init_net() does not set the netns_immutable flag on the per-netns fallback tunnel device (ip6_vti0). Other similar tunnel drivers (like ip6_tunnel, sit, ip6_gre, and ip_tunnel) correctly set this flag during their fallback device initialization to prevent them from being moved to another network namespace. The Linux kernel CVE team has assigned CVE-2026-52909 to this issue. Affected and fixed versions =========================== Issue introduced in 3.15 with commit 61220ab349485d911083d0b7990ccd3db6c63297 and fixed in 6.18.36 with commit ecf8904067dcba0dad86ece80874841e60317885 Issue introduced in 3.15 with commit 61220ab349485d911083d0b7990ccd3db6c63297 and fixed in 7.0.13 with commit dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 Issue introduced in 3.15 with commit 61220ab349485d911083d0b7990ccd3db6c63297 and fixed in 7.1 with commit d289d5307762d1838aaece22c6b6fcad9e8865f9 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-2026-52909 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: net/ipv6/ip6_vti.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/ecf8904067dcba0dad86ece80874841e60317885 https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3 https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9