From bippy-851b3ed3d212 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman To: Reply-to: , Subject: CVE-2021-47064: mt76: fix potential DMA mapping leak Description =========== In the Linux kernel, the following vulnerability has been resolved: mt76: fix potential DMA mapping leak With buf uninitialized in mt76_dma_tx_queue_skb_raw, its field skip_unmap could potentially inherit a non-zero value from stack garbage. If this happens, it will cause DMA mappings for MCU command frames to not be unmapped after completion The Linux kernel CVE team has assigned CVE-2021-47064 to this issue. Affected and fixed versions =========================== Issue introduced in 5.10 with commit 27d5c528a7ca and fixed in 5.10.37 with commit 9fa26701cd1f Issue introduced in 5.10 with commit 27d5c528a7ca and fixed in 5.11.21 with commit 9b68ce2856da Issue introduced in 5.10 with commit 27d5c528a7ca and fixed in 5.12.4 with commit 91b9548d413f Issue introduced in 5.10 with commit 27d5c528a7ca and fixed in 5.13 with commit b4403cee6400 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-2021-47064 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/dma.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/9fa26701cd1fc4d932d431971efc5746325bdfce https://git.kernel.org/stable/c/9b68ce2856dadc0e1cb6fd21fbeb850da49efd08 https://git.kernel.org/stable/c/91b9548d413fda488ea853cd1b9f59b572db3a0c https://git.kernel.org/stable/c/b4403cee6400c5f679e9c4a82b91d61aa961eccf