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 1C58F4A1DEB for ; Thu, 24 Sep 2026 15:30:38 +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=1790263841; cv=none; b=UOaIMh9jQJe/YfGKcG0On49wrjXITcsB5O4dNsvzSP2tA8/LsU8j5i5gaRoXoc+EbRGNYwNSv0PEWNcge3/kFXJ/MrArLAYma6/UEDTZf4mqTKUMhoI6WinTSnwhkWrb2H+dSEEh73c7yipNPNe1hzzPeZlSqDwmj7o5Wz5/ofo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790263841; c=relaxed/simple; bh=9HKaUhcW43xym5vPnAynJsogilLEdRgLeWr7Ql0jR1k=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=LFz/iW75+TgPBsblztVfReaDRqNGWbFicfmb579RtvHsUVWUeNO3lzZmi0jtgXAD1lFcakzdA4N1n6J3so330ZreHD3prBXaot5qxeiyzQBKP+M7H2chWwx41AFNDRCattoeqvQSfzBGc62U+5Zn7AoV0BQjzh4FsHdUPau/4Sk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=08ObLhWO; 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="08ObLhWO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96DDC1F000FF; Thu, 24 Sep 2026 15:30:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790263838; bh=7ilsvqcr7UlDL8byvRk4KCLJMe5V02HbQBuM7vam/w8=; h=From:To:Cc:Subject:Date:Reply-To; b=08ObLhWOIz/klAL0LedDPrPVIDul6rulN0PmRRl8/d/MvTyTLPWWGX/EOkIbhTNUg bJHdOCxcurFcqvwHGIMdHkXyyKz7D7IMoBoVvQaH6P4WOdJXN+/aaCAxCgocGqRJud 7OppXFBpSmVan4UexPnK+veC4Z9Oq169u3juEGE8= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-93231: lockd: fix swapped arguments in nlmsvc_match_ip() Date: Thu, 24 Sep 2026 17:28:47 +0200 Message-ID: <2026092442-CVE-2026-93231-7b49@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=3550; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=06WH4vn8hAZ1eZUMWBwlW/t+k2JAmvKfXvnijY7xRBU=; b=kA0DAAIRMUfUDdst+ykByyZiAGq1Qaqj37P4f9dqL8uVniDZUpRnK0ZJ000nJS8t9TaYRtReD YhdBAARAgAdFiEE9LYMxb94wiFKMT3LMUfUDdst+ykFAmq1QaoACgkQMUfUDdst+ymgOACeLXIw DiUbINNtbQpFkBJDH2xXWzEAn37Kr6wCwbDUnVDebMMY6+CNhotb 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: lockd: fix swapped arguments in nlmsvc_match_ip() When releasing locks by server IP address via /proc/fs/nfsd/unlock_ip, nlmsvc_unlock_all_by_ip() calls nlm_traverse_files() with the server sockaddr as the opaque @data argument: nlm_traverse_files(server_addr, nlmsvc_match_ip, NULL); The match callback is later invoked from nlm_traverse_locks() as: match(lockhost, host); where the first argument is the nlm_host that owns the lock, and the second argument is the @data that was originally passed down (here the server sockaddr). This is the convention every other match callback relies on (nlmsvc_mark_host(), nlmsvc_same_host(), nlmsvc_is_client()): arg1 is the real nlm_host, arg2 is the caller-supplied reference value. nlmsvc_match_ip() has had these two arguments reversed ever since the unlock-by-IP feature was introduced in commit 4373ea84c84d ("lockd: unlock lockd locks associated with a given server ip"): return rpc_cmp_addr(nlm_srcaddr(host), datap); Here @host is actually the server sockaddr, so nlm_srcaddr(host) dereferences a struct sockaddr as a struct nlm_host and reads garbage at the offset of h_srcaddr; meanwhile @datap is actually the lock owner's nlm_host but is compared as a sockaddr. As a result the comparison practically never matches and locks are not released for the requested IP. Swap the arguments so the lock owner's source address is compared against the requested server address: return rpc_cmp_addr(nlm_srcaddr(datap), (struct sockaddr *)host); [ cel: fix the misleading typedef parameter names too ] The Linux kernel CVE team has assigned CVE-2026-93231 to this issue. Affected and fixed versions =========================== Issue introduced in 2.6.26 with commit 4373ea84c84d8a96e99d3da99e813d3e36d1bd11 and fixed in 6.18.51 with commit 0d72e78c9d38d5377a059a4837f82b65b91cdcf6 Issue introduced in 2.6.26 with commit 4373ea84c84d8a96e99d3da99e813d3e36d1bd11 and fixed in 7.2.4 with commit 21bcb609e0ab1dd60f39ca3498f85808933bcc9f Issue introduced in 2.6.26 with commit 4373ea84c84d8a96e99d3da99e813d3e36d1bd11 and fixed in 7.3-rc1 with commit b9060689f49dc663e9a3d069c4a65ff63a836e66 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-2026-93231 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/lockd/lockd.h fs/lockd/svcsubs.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/0d72e78c9d38d5377a059a4837f82b65b91cdcf6 https://git.kernel.org/stable/c/21bcb609e0ab1dd60f39ca3498f85808933bcc9f https://git.kernel.org/stable/c/b9060689f49dc663e9a3d069c4a65ff63a836e66