| 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-2023-52941: can: isotp: split tx timer into transmission and timeout |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| can: isotp: split tx timer into transmission and timeout |
| |
| The timer for the transmission of isotp PDUs formerly had two functions: |
| 1. send two consecutive frames with a given time gap |
| 2. monitor the timeouts for flow control frames and the echo frames |
| |
| This led to larger txstate checks and potentially to a problem discovered |
| by syzbot which enabled the panic_on_warn feature while testing. |
| |
| The former 'txtimer' function is split into 'txfrtimer' and 'txtimer' |
| to handle the two above functionalities with separate timer callbacks. |
| |
| The two simplified timers now run in one-shot mode and make the state |
| transitions (especially with isotp_rcv_echo) better understandable. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52941 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.1 with commit 866337865f3747c68a3e7bb837611e39cec1ecd6 and fixed in 6.1.11 with commit cae4c9bc35f72af5d4a079bb9d9fd62c4088a411 |
| Issue introduced in 6.1 with commit 866337865f3747c68a3e7bb837611e39cec1ecd6 and fixed in 6.2 with commit 4f027cba8216f42a18b544842efab134f8b1f9f4 |
| Issue introduced in 6.0.9 with commit 3cb476cf834edca47f4470c276feb0f519401fb7 |
| |
| 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-2023-52941 |
| 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: |
| net/can/isotp.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/cae4c9bc35f72af5d4a079bb9d9fd62c4088a411 |
| https://git.kernel.org/stable/c/4f027cba8216f42a18b544842efab134f8b1f9f4 |
