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 A4191468C26 for ; Sun, 18 Oct 2026 15:54:30 +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=1792338871; cv=none; b=tFNdjsh+04EVF6vBEDDarSpdHy/9+a2HJu8ifogyiuoA1mLXGp8Epmry10mSrduyENe7kF7xiyPKUnZJKWb65gIOTI/MGy1KpWwkvx61NLvWSvtqEOh03KIYB9YSz6D/PIy4PFK/QHmFW8ormsuLz++4ZfTHW7A96N9jmTcfzbg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792338871; c=relaxed/simple; bh=3r/SjHm6v0tmSX2jwhwl3ZI+ZG4ropnmEsost8Heyck=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=EcwqdedIykCwqsp1R/8aK5+GtKrtIhA3hxP/9sVLt12d2Niu5pa0RYHXcQ0G49HAfEOiOhJ6zSwbn+0f5GPWrRnK6pFEwS4eSFkVe5aF4fys4CZ1RrYfKB/MRx+yJwbvACVzxgU6MM0Sryc+M0GG1yDyrCnyGkH1v7FKiCcbhwY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YQ9zZ9nT; 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="YQ9zZ9nT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6AB21F000C4; Sun, 18 Oct 2026 15:54:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792338870; bh=x47kWm0S89/P0MJqSBrQ4hfrQ24RnosPepMuzWHpNf0=; h=From:To:Cc:Subject:Date:Reply-To; b=YQ9zZ9nTJoTXfX5QjPWjKpVFL4A4HEVWqdZx3iLSZUhWkgth78c2SYDqpG70Oxach ymjBZdPZsunDk6Kre91eaUhGRWvtMS6ZT6hiKPFlXw/4xgCGN0ay1JI9HNAPZ+r2/c gcnu9xZ3BmAVVkwpn6u0j5Zt79VAKQXNgwkQRL54= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-98723: nvmet: copy the hostid into the ctrl before creating PR pc_refs Date: Sun, 18 Oct 2026 17:44:58 +0200 Message-ID: <2026101809-CVE-2026-98723-727d@gregkh> X-Mailer: git-send-email 2.56.0 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=3283; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=lG5D57omx05Ez4onKyw8swODPFA6WWHMjZIASlTj6kw=; b=owGbwMvMwCRo6H6F97bub03G02pJDFlXXnrmWgT2sIo1ZTXrVs79OnOu9EzdkwrTynjVd7rc/ FqbKC/eEcvCIMjEICumyPJlG8/R/RWHFL0MbU/DzGFlAhnCwMUpABP5Kcew4Nqpx9tzDwQomclP /CkQMnGpJLdKDMOC7R+Nrqgfl/7T4XXJhtvydESekfkxAA== 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: nvmet: copy the hostid into the ctrl before creating PR pc_refs Commit 6202783184bf ("nvmet: Improve nvmet_alloc_ctrl() interface and implementation") added a second uuid_copy() of args->hostid near the end of nvmet_alloc_ctrl(), and commit 7b658153f1b8 ("nvmet: Remove duplicate uuid_copy") removed the original copy that sat before nvmet_ctrl_init_pr() instead of the new one. Since then nvmet_ctrl_init_pr() snapshots ctrl->hostid into the per-controller per-namespace reservation refs while the uuid_copy() from the connect data runs later, after the controller is published. The ctrl is allocated with kzalloc(), so every pc_ref created on this path stores the nil UUID. pc_ref->hostid has a single consumer: nvmet_pr_set_ctrl_to_abort() matches it against the preempted registrant's hostid to kill and drain the victim's in-flight I/O for Preempt and Abort. The match can never hit with the nil UUID, so whenever a namespace with reservations enabled exists before a host connects, which includes every reconnect, Preempt and Abort silently degrades into a plain Preempt: the preempting host sees success while the victim's in-flight I/O is still in the air. Copy the hostid where the rest of the connect data is consumed, before the controller is published and before nvmet_ctrl_init_pr() takes its snapshot. The Linux kernel CVE team has assigned CVE-2026-98723 to this issue. Affected and fixed versions =========================== Issue introduced in 6.15 with commit 7b658153f1b8a79ed98980f2fef7b92a66aeb9cd and fixed in 6.18.56 with commit d3d6d7efdacc08616d23b3ac42272a494951dc0f Issue introduced in 6.15 with commit 7b658153f1b8a79ed98980f2fef7b92a66aeb9cd and fixed in 7.2.10 with commit 23194531595c5d1d4454e3a607b0c8fc0c4e8695 Issue introduced in 6.15 with commit 7b658153f1b8a79ed98980f2fef7b92a66aeb9cd and fixed in 7.3-rc6 with commit 5211fed41d7ec90e9ab7239dc4bffffe4d0b2b62 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-2026-98723 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/nvme/target/core.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/d3d6d7efdacc08616d23b3ac42272a494951dc0f https://git.kernel.org/stable/c/23194531595c5d1d4454e3a607b0c8fc0c4e8695 https://git.kernel.org/stable/c/5211fed41d7ec90e9ab7239dc4bffffe4d0b2b62