| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47475: comedi: vmk80xx: fix transfer-buffer overflows |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| comedi: vmk80xx: fix transfer-buffer overflows |
| |
| The driver uses endpoint-sized USB transfer buffers but up until |
| recently had no sanity checks on the sizes. |
| |
| Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize |
| of usb endpoints found") inadvertently fixed NULL-pointer dereferences |
| when accessing the transfer buffers in case a malicious device has a |
| zero wMaxPacketSize. |
| |
| Make sure to allocate buffers large enough to handle also the other |
| accesses that are done without a size check (e.g. byte 18 in |
| vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond |
| the buffers, for example, when doing descriptor fuzzing. |
| |
| The original driver was for a low-speed device with 8-byte buffers. |
| Support was later added for a device that uses bulk transfers and is |
| presumably a full-speed device with a maximum 64-byte wMaxPacketSize. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47475 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 4.4.292 with commit 5229159f1d052821007aff1a1beb7873eacf1a9f |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 4.9.290 with commit ec85bcff4ed09260243d8f39faba99e1041718ba |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 4.14.255 with commit 40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 4.19.217 with commit 7a2021b896de1ad559d33b5c5cdd20b982242088 |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 5.4.159 with commit 199acd8c110e3ae62833c24f632b0bb1c9f012a9 |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 5.10.79 with commit 33d7a470730dfe7c9bfc8da84575cf2cedd60d00 |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 5.14.18 with commit 278484ae93297b1bb1ce755f9d3b6d95a48c7d47 |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 5.15.2 with commit 06ac746d57e6d32b062e220415c607b7e2e0fa50 |
| Issue introduced in 2.6.31 with commit 985cafccbf9b7f862aa1c5ee566801e18b5161fb and fixed in 5.16 with commit a23461c47482fc232ffc9b819539d1f837adf2b1 |
| |
| 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-2021-47475 |
| 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/comedi/drivers/vmk80xx.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/5229159f1d052821007aff1a1beb7873eacf1a9f |
| https://git.kernel.org/stable/c/ec85bcff4ed09260243d8f39faba99e1041718ba |
| https://git.kernel.org/stable/c/40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 |
| https://git.kernel.org/stable/c/7a2021b896de1ad559d33b5c5cdd20b982242088 |
| https://git.kernel.org/stable/c/199acd8c110e3ae62833c24f632b0bb1c9f012a9 |
| https://git.kernel.org/stable/c/33d7a470730dfe7c9bfc8da84575cf2cedd60d00 |
| https://git.kernel.org/stable/c/278484ae93297b1bb1ce755f9d3b6d95a48c7d47 |
| https://git.kernel.org/stable/c/06ac746d57e6d32b062e220415c607b7e2e0fa50 |
| https://git.kernel.org/stable/c/a23461c47482fc232ffc9b819539d1f837adf2b1 |
