| 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-2022-49479: mt76: fix tx status related use-after-free race on station removal |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| mt76: fix tx status related use-after-free race on station removal |
| |
| There is a small race window where ongoing tx activity can lead to a skb |
| getting added to the status tracking idr after that idr has already been |
| cleaned up, which will keep the wcid linked in the status poll list. |
| Fix this by only adding status skbs if the wcid pointer is still assigned |
| in dev->wcid, which gets cleared early by mt76_sta_pre_rcu_remove |
| |
| The Linux kernel CVE team has assigned CVE-2022-49479 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit bd1e3e7b693c17a04e7d2bd9119daa482b7c7720 and fixed in 5.17.14 with commit ef7f9f894cfd0b2e471206409a529af4a26ddd55 |
| Issue introduced in 5.16 with commit bd1e3e7b693c17a04e7d2bd9119daa482b7c7720 and fixed in 5.18.3 with commit ddd426d72aca4054045a9bd3b80a4ce1d398f11f |
| Issue introduced in 5.16 with commit bd1e3e7b693c17a04e7d2bd9119daa482b7c7720 and fixed in 5.19 with commit fcfe1b5e162bf473c1d47760962cec8523c00466 |
| |
| 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-2022-49479 |
| 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/mediatek/mt76/mac80211.c |
| drivers/net/wireless/mediatek/mt76/tx.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/ef7f9f894cfd0b2e471206409a529af4a26ddd55 |
| https://git.kernel.org/stable/c/ddd426d72aca4054045a9bd3b80a4ce1d398f11f |
| https://git.kernel.org/stable/c/fcfe1b5e162bf473c1d47760962cec8523c00466 |
