| 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-2024-40977: wifi: mt76: mt7921s: fix potential hung tasks during chip recovery |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| wifi: mt76: mt7921s: fix potential hung tasks during chip recovery |
| |
| During chip recovery (e.g. chip reset), there is a possible situation that |
| kernel worker reset_work is holding the lock and waiting for kernel thread |
| stat_worker to be parked, while stat_worker is waiting for the release of |
| the same lock. |
| It causes a deadlock resulting in the dumping of hung tasks messages and |
| possible rebooting of the device. |
| |
| This patch prevents the execution of stat_worker during the chip recovery. |
| |
| The Linux kernel CVE team has assigned CVE-2024-40977 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.16 with commit 7bc04215a66b60e198aecaee8418f6d79fa19faa and fixed in 6.1.96 with commit 0b81faa05b0b9feb3ae2d69be1d21f0d126ecb08 |
| Issue introduced in 4.16 with commit 7bc04215a66b60e198aecaee8418f6d79fa19faa and fixed in 6.6.36 with commit 85edd783f4539a994d66c4c014d5858f490b7a02 |
| Issue introduced in 4.16 with commit 7bc04215a66b60e198aecaee8418f6d79fa19faa and fixed in 6.9.7 with commit e974dd4c22a23ec3ce579fb6d31a674ac0435da9 |
| Issue introduced in 4.16 with commit 7bc04215a66b60e198aecaee8418f6d79fa19faa and fixed in 6.10 with commit ecf0b2b8a37c8464186620bef37812a117ff6366 |
| |
| 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-2024-40977 |
| 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/mt7921/mac.c |
| drivers/net/wireless/mediatek/mt76/mt7921/pci_mac.c |
| drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c |
| drivers/net/wireless/mediatek/mt76/sdio.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/0b81faa05b0b9feb3ae2d69be1d21f0d126ecb08 |
| https://git.kernel.org/stable/c/85edd783f4539a994d66c4c014d5858f490b7a02 |
| https://git.kernel.org/stable/c/e974dd4c22a23ec3ce579fb6d31a674ac0435da9 |
| https://git.kernel.org/stable/c/ecf0b2b8a37c8464186620bef37812a117ff6366 |
