From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 AF27B17C21A for ; Thu, 20 Jun 2024 12:08:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718885286; cv=none; b=ByaNP8iUpRsM5j1TJ+gRY9pf4VkDLWwSGz3NOb4rv7RZABWZhoo8EZHaRacp9DAJze/ORpbXK2iQVm2umE9jReLMp/Wt0KxpjoADZTMWKVVO2JUJUPwU4sKc2ViqFvEgxQvhvEjcFFsbM7raPJYGd67jDIXMvXLKbBaDw8sLfXE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718885286; c=relaxed/simple; bh=tAA2zqRJCukSUjR9YOYeZ4TOQgmYVE9uO9pLNLKFIOc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=piOXLwRbSEG7k9rMkCCq/egwLDoIATsumCmAPc58JwUw7tcfLN/lusfnWoVCtdeTJEz60eFxwWS6ZOA6z3NHOgG3u4eaBqIhIArudGwDX1PMm+ZgZrCxfa7XYRvEmYWL5zx0bVODVmPdf2c4UceQNMMM92LPtXdNCMHnVKABfdg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=X8fT5Pmr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="X8fT5Pmr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB1D6C2BD10; Thu, 20 Jun 2024 12:08:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1718885286; bh=tAA2zqRJCukSUjR9YOYeZ4TOQgmYVE9uO9pLNLKFIOc=; h=From:To:Cc:Subject:Date:Reply-to:From; b=X8fT5Pmrsj6SPxntH66QwjRvbVg7JCXNtevuFZFrKB+NU5LuBRil2/+Z1Yfk3SzrC UY8kGPI6iF5JOo4gSN8yXswJ9M+tfqBe1nixDaFR5NzJSGzThFMK+l7GmJjtj783Yt SrkDd5hsb5HfVp50IccDOlmFCe6bGanqk6UwTSA8= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2021-4439: isdn: cpai: check ctr->cnr to avoid array index out of bound Date: Thu, 20 Jun 2024 14:08:02 +0200 Message-ID: <2024062001-CVE-2021-4439-59ce@gregkh> X-Mailer: git-send-email 2.45.2 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=3665; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=tAA2zqRJCukSUjR9YOYeZ4TOQgmYVE9uO9pLNLKFIOc=; b=owGbwMvMwCRo6H6F97bub03G02pJDGkl0gvzjnpVNJRP5d5rP/EM+879fxrS4s/n+L17s9Fqc flMgbBbHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCR7C6G+UXfrv04eyOoY4Ho lriF0/78bb3FuIBhvut1m/sqyiuXvSnonHUn88rDE6p7PgEA X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: isdn: cpai: check ctr->cnr to avoid array index out of bound The cmtp_add_connection() would add a cmtp session to a controller and run a kernel thread to process cmtp. __module_get(THIS_MODULE); session->task = kthread_run(cmtp_session, session, "kcmtpd_ctr_%d", session->num); During this process, the kernel thread would call detach_capi_ctr() to detach a register controller. if the controller was not attached yet, detach_capi_ctr() would trigger an array-index-out-bounds bug. [ 46.866069][ T6479] UBSAN: array-index-out-of-bounds in drivers/isdn/capi/kcapi.c:483:21 [ 46.867196][ T6479] index -1 is out of range for type 'capi_ctr *[32]' [ 46.867982][ T6479] CPU: 1 PID: 6479 Comm: kcmtpd_ctr_0 Not tainted 5.15.0-rc2+ #8 [ 46.869002][ T6479] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-2 04/01/2014 [ 46.870107][ T6479] Call Trace: [ 46.870473][ T6479] dump_stack_lvl+0x57/0x7d [ 46.870974][ T6479] ubsan_epilogue+0x5/0x40 [ 46.871458][ T6479] __ubsan_handle_out_of_bounds.cold+0x43/0x48 [ 46.872135][ T6479] detach_capi_ctr+0x64/0xc0 [ 46.872639][ T6479] cmtp_session+0x5c8/0x5d0 [ 46.873131][ T6479] ? __init_waitqueue_head+0x60/0x60 [ 46.873712][ T6479] ? cmtp_add_msgpart+0x120/0x120 [ 46.874256][ T6479] kthread+0x147/0x170 [ 46.874709][ T6479] ? set_kthread_struct+0x40/0x40 [ 46.875248][ T6479] ret_from_fork+0x1f/0x30 [ 46.875773][ T6479] The Linux kernel CVE team has assigned CVE-2021-4439 to this issue. Affected and fixed versions =========================== Fixed in 4.4.290 with commit e8b8de17e164 Fixed in 4.9.288 with commit 24219a977bfe Fixed in 4.14.253 with commit 9b6b2db77bc3 Fixed in 4.19.214 with commit 7d91adc0ccb0 Fixed in 5.4.156 with commit 285e9210b1fa Fixed in 5.10.76 with commit 7f221ccbee4e Fixed in 5.14.15 with commit cc20226e218a Fixed in 5.15 with commit 1f3e2e97c003 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-2021-4439 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/isdn/capi/kcapi.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/e8b8de17e164c9f1b7777f1c6f99d05539000036 https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75 https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54 https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594 https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d