| From bippy-1.0.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47670: can: peak_usb: fix use after free bugs |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| can: peak_usb: fix use after free bugs |
| |
| After calling peak_usb_netif_rx_ni(skb), dereferencing skb is unsafe. |
| Especially, the can_frame cf which aliases skb memory is accessed |
| after the peak_usb_netif_rx_ni(). |
| |
| Reordering the lines solves the issue. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47670 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 4.19.171 with commit 5408824636fa0dfedb9ecb0d94abd573131bfbbe |
| Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 5.4.93 with commit ddd1416f44130377798c1430b76503513b7497c2 |
| Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 5.10.11 with commit ec939c13c3fff2114479769c8380b7f1a54feca9 |
| Issue introduced in 4.0 with commit 0a25e1f4f18566b750ebd3ae995af64e23111e63 and fixed in 5.11 with commit 50aca891d7a554db0901b245167cd653d73aaa71 |
| |
| 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-2021-47670 |
| 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/net/can/usb/peak_usb/pcan_usb_fd.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/5408824636fa0dfedb9ecb0d94abd573131bfbbe |
| https://git.kernel.org/stable/c/ddd1416f44130377798c1430b76503513b7497c2 |
| https://git.kernel.org/stable/c/ec939c13c3fff2114479769c8380b7f1a54feca9 |
| https://git.kernel.org/stable/c/50aca891d7a554db0901b245167cd653d73aaa71 |
