| 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-2022-49539: rtw89: ser: fix CAM leaks occurring in L2 reset |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| rtw89: ser: fix CAM leaks occurring in L2 reset |
| |
| The CAM, meaning address CAM and bssid CAM here, will get leaks during |
| SER (system error recover) L2 reset process and ieee80211_restart_hw() |
| which is called by L2 reset process eventually. |
| |
| The normal flow would be like |
| -> add interface (acquire 1) |
| -> enter ips (release 1) |
| -> leave ips (acquire 1) |
| -> connection (occupy 1) <(A) 1 leak after L2 reset if non-sec connection> |
| |
| The ieee80211_restart_hw() flow (under connection) |
| -> ieee80211 reconfig |
| -> add interface (acquire 1) |
| -> leave ips (acquire 1) |
| -> connection (occupy (A) + 2) <(B) 1 more leak> |
| |
| Originally, CAM is released before HW restart only if connection is under |
| security. Now, release CAM whatever connection it is to fix leak in (A). |
| OTOH, check if CAM is already valid to avoid acquiring multiple times to |
| fix (B). |
| |
| Besides, if AP mode, release address CAM of all stations before HW restart. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49539 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit e3ec7017f6a20d12ddd9fe23d345ebb7b8c104dd and fixed in 5.18.3 with commit f6aff772c9978844529618d86aafb53e5d3ae161 |
| Issue introduced in 5.16 with commit e3ec7017f6a20d12ddd9fe23d345ebb7b8c104dd and fixed in 5.19 with commit b169f877f001a474fb89939842c390518160bcc5 |
| |
| 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-2022-49539 |
| 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/wireless/realtek/rtw89/cam.c |
| drivers/net/wireless/realtek/rtw89/ser.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/f6aff772c9978844529618d86aafb53e5d3ae161 |
| https://git.kernel.org/stable/c/b169f877f001a474fb89939842c390518160bcc5 |
