| 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-2021-47286: bus: mhi: core: Validate channel ID when processing command completions |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bus: mhi: core: Validate channel ID when processing command completions |
| |
| MHI reads the channel ID from the event ring element sent by the |
| device which can be any value between 0 and 255. In order to |
| prevent any out of bound accesses, add a check against the maximum |
| number of channels supported by the controller and those channels |
| not configured yet so as to skip processing of that event ring |
| element. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47286 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.7 with commit 1d3173a3bae7039b765a0956e3e4bf846dbaacb8 and fixed in 5.10.54 with commit 3efec3b4b16fc7af25676a94230a8ab2a3bb867c |
| Issue introduced in 5.7 with commit 1d3173a3bae7039b765a0956e3e4bf846dbaacb8 and fixed in 5.13.6 with commit aed4f5b51aba41e2afd7cfda20a0571a6a67dfe9 |
| Issue introduced in 5.7 with commit 1d3173a3bae7039b765a0956e3e4bf846dbaacb8 and fixed in 5.14 with commit 546362a9ef2ef40b57c6605f14e88ced507f8dd0 |
| |
| 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-2021-47286 |
| 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/bus/mhi/core/main.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/3efec3b4b16fc7af25676a94230a8ab2a3bb867c |
| https://git.kernel.org/stable/c/aed4f5b51aba41e2afd7cfda20a0571a6a67dfe9 |
| https://git.kernel.org/stable/c/546362a9ef2ef40b57c6605f14e88ced507f8dd0 |
