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 50F733A6417 for ; Sun, 19 Jul 2026 15:41:13 +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=1784475674; cv=none; b=Xr4oV/GoL0P0uBndFIuqLMItsSqTuGvD/pPueX1QJ4edEPkDpQ9JinVph07ar9FigJ054gSRNQmSMZvaghIGfOeU5DGR0t/raAYyO+Qadu9fDy/Duil7c82EGZG46myLfUQ3RSMOnj9zOSsafQUUqExNtjERgoxWZFFOaWT3PuA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784475674; c=relaxed/simple; bh=woFd5aeQXSHb5DVzGFB/ZNEfKJFDaYuQpv73kzlmBlE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=pHzYeIoer2OuSPGeXYEKtixRa7omjld69QNtYseNgCQIl09c/GfSmJv0SFkDP06A9xfp79agV+HhiPp7PJrWkqraEBofp6FS7G0MbjjS9c+dsOKecUn4D52t2uY+71OXvmoYgxFem08q7GVqYp0Yro4UWmSsyFIfqfmQ74mZBrU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zrOZKo0+; 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="zrOZKo0+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60FC81F000E9; Sun, 19 Jul 2026 15:41:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784475672; bh=NmFx/PqzTig455S2I0EjKDNv9wUaUaw5Yi1Tjh8wo+M=; h=From:To:Cc:Subject:Date:Reply-To; b=zrOZKo0+SJDxN+sPOUnL2lTmXndx8ODd1txdWwfjzPk9yJpLQTSpvYWiBVvpjErb+ J4U3CGCexRIfiCXK5eseVHV0zvGoRJeRu/ylGU11jFKFaXCc7GzvY3Nk2BjE7m3699 YynnIYRfH/cgMDhYmiYNVu1y9TLgiU3EBS4rgoZM= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-64043: ovpn: fix race between deleting interface and adding new peer Date: Sun, 19 Jul 2026 17:38:25 +0200 Message-ID: <2026071906-CVE-2026-64043-b591@gregkh> X-Mailer: git-send-email 2.55.0 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=3088; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=mEc+mlwFtkxXyMEk2sPioFtLVVPtY/d3E5HRIO3GME0=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkx7+PYCvdsfVZhNH1xns+SLecaxaPab/O4WJ0zCLF01 lvjcfVkRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEyEL4RhQfe+slCpFa+1+Hay maxRnTVz9Qs9L6Co3AnZ1b8l/0Qc2TEj2rZG4cE86x4A 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: ovpn: fix race between deleting interface and adding new peer While deleting an existing ovpn interface, there is a very narrow window where adding a new peer via netlink may cause the netdevice to hang and prevent its unregistration. It may happen during ovpn_dellink(), when all existing peers are freed and the device is queued for deregistration, but a CMD_PEER_NEW message comes in adding a new peer that takes again a reference to the netdev. At this point there is no way to release the device because we are under the assumption that all peers were already released. Fix the race condition by releasing all peers in ndo_uninit(), when the netdevice has already been removed from the netdev list. Also ovpn_peer_add() has now an extra check that forces the function to bail out if the device reg_state is not REGISTERED. This way any incoming CMD_PEER_NEW racing with the interface deletion routine will simply stop before adding the peer. Note that the above check happens while holding the netdev_lock to prevent racing netdev state changes. ovpn_dellink() is now empty and can be removed. The Linux kernel CVE team has assigned CVE-2026-64043 to this issue. Affected and fixed versions =========================== Issue introduced in 6.16 with commit 80747caef33d77f5c1b3d24644e6d7dae69066b5 and fixed in 6.18.34 with commit 097d62df38314c14b88fab9096f3461baf158e2b Issue introduced in 6.16 with commit 80747caef33d77f5c1b3d24644e6d7dae69066b5 and fixed in 7.0.11 with commit de9fec2a6645f5b4d23398cd870a33e2703728d9 Issue introduced in 6.16 with commit 80747caef33d77f5c1b3d24644e6d7dae69066b5 and fixed in 7.1 with commit 982422b11e6f95f766a8cd2c2b1cbdb77e234a61 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-2026-64043 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: drivers/net/ovpn/main.c drivers/net/ovpn/peer.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/097d62df38314c14b88fab9096f3461baf158e2b https://git.kernel.org/stable/c/de9fec2a6645f5b4d23398cd870a33e2703728d9 https://git.kernel.org/stable/c/982422b11e6f95f766a8cd2c2b1cbdb77e234a61