From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793187412; b=ANfAAtUH4730Qnh77zO7Xq3Qg5n0G6P+FKtdErKCwRVmsX3+ARRvkzNPsNH2qFbx2rb+ QfjG5WNADDh3Zif5QDCzoFkBlA1Yx+JSOCcDFstP1qF+aZEpOOwI+L4TcBtUqZVt33+WY 0vEpJuSZ2LaKBbjj/AqJbd6fwq66jBx+nwslvgkXKmsfDfqG0eu+RNuQF4HE7avjIMUJW sbgU2qVMNEaoaug3j0NyEGuOTgwlvAr1hIK67WQHdDjpVvxPkyVBQso2FJpAib8qwswOy +tQAwQQYECsFJWhZnEmt4ywZD3JaVn/tCkSGYii/lNprcBWkI7YxjDJAhArobyM0yFg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793187412; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: Reply-To:MIME-Version:Lines:X-Developer-Signature:X-Developer-Key: Content-Transfer-Encoding; bh=tOmj3HbPB4628S+WcBJX0udyBkHADBNBqPR1fNx1KUQ=; b=SlkjTkfbW1LtzXV6cW73vRUNktv/jZmqHkwB9knxQGTtnXQNuDIcsOU30jPu8IhNz1f8 uESkqlH+cYm1KufpE4G27JPZ2k9iaqQOMeOYLhe6QsjeurTrLS0OyyHzThNBko+j4OyHW /TM2oa4986MwUOE+DlUIVtwFqq3VpWwAimCIsnOysI++vjWkPJDKd9nz4OBPwirSmJA4Z 4AHYmBJehXWJKoA98huKrHTo4RBBOdPBWgR7LNBq7u5OGaMFx3oG3MNnibdCAvmFrbYEo 3z0obqT0tL+RtfJHLxqFRYuZxsObG50uqkJsAemhLXgW2xRboDJe6zuqWXFvE7VIOjA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=EsbVZFdX; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9B98B606A31C for ; Wed, 28 Oct 2026 11:36:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=EsbVZFdX Received: by smtp.kernel.org (Postfix) with ESMTPSA id 717E91F01825; Wed, 28 Oct 2026 11:36:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793187412; bh=tOmj3HbPB4628S+WcBJX0udyBkHADBNBqPR1fNx1KUQ=; h=From:To:Cc:Subject:Date:Reply-To; b=EsbVZFdXB75KdRz2XGAnx5TJTdal9qoFpCXKclFFySDgNlGPLT2kSzj5W6oXt+exP 9uKH17SjIR15eS4/jMHyyYU1G4h5+HYJSV9CTWCatMv/sGxPd7bZksnL5snTxnsC5s k+J6U3hAvOA8jmp/NyEkc3VbC6YqMEk63V+SO9KY= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2026-99115: ksmbd: fill in FileSysIdentifier in FS_POSIX_INFORMATION Date: Wed, 28 Oct 2026 11:35:02 +0100 Message-ID: <2026102855-CVE-2026-99115-e2bd@gregkh> X-Mailer: git-send-email 2.56.0 Reply-To: , X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2848; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=3CiKun/8pjFrdwUlenh19JVC+biXfzgrP5L69y4fNQU=; b=owGbwMvMwCRo6H6F97bub03G02pJDFkPz5//ybFyFevuYNFqvZlCyV2fEwTKM8vyhKRXHw3/c OjE62OaHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCRth6GeQrbAm5n7aw+cCbp 383HoTYnLbfMXsiwYM5iLoclf+7q5EV6LPLvLX07r2XKJQA= 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: ksmbd: fill in FileSysIdentifier in FS_POSIX_INFORMATION smb2_get_info_filesystem() reports 56 bytes for FS_POSIX_INFORMATION, that is the whole of FILE_SYSTEM_POSIX_INFO, but never assigns FileSysIdentifier. Those eight bytes go to the client as they are found in the response buffer. The buffer is zeroed on allocation, so a standalone request leaks nothing. A compound request can leak: the offset of the next response is advanced by the length pinned for the previous one, so a reply that was written into the buffer and then dropped in favour of the short error response of smb2_set_err_rsp() stays there, and the next reply is laid over it with only the header cleared. Report the file system id statfs() returned, which is what the field is for. FileSysIdentifier is __le64 and f_fsid is a pair of ints, so assemble the value first, val[0] as the low half, and convert it on the way out. The Linux kernel CVE team has assigned CVE-2026-99115 to this issue. Affected and fixed versions =========================== Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 6.18.59 with commit beba2ef6f66a71f20531ac70a1acb0b221e362e9 Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 7.2.13 with commit ab057f271ef60ff8163818badc3de75c480eca07 Issue introduced in 5.15 with commit e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and fixed in 7.3 with commit db2267b27c054a6c2151ff7fbb67927e784f31d6 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-2026-99115 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/smb/server/smb2pdu.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/beba2ef6f66a71f20531ac70a1acb0b221e362e9 https://git.kernel.org/stable/c/ab057f271ef60ff8163818badc3de75c480eca07 https://git.kernel.org/stable/c/db2267b27c054a6c2151ff7fbb67927e784f31d6