| 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-2022-49711: bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| bus: fsl-mc-bus: fix KASAN use-after-free in fsl_mc_bus_remove() |
| |
| In fsl_mc_bus_remove(), mc->root_mc_bus_dev->mc_io is passed to |
| fsl_destroy_mc_io(). However, mc->root_mc_bus_dev is already freed in |
| fsl_mc_device_remove(). Then reference to mc->root_mc_bus_dev->mc_io |
| triggers KASAN use-after-free. To avoid the use-after-free, keep the |
| reference to mc->root_mc_bus_dev->mc_io in a local variable and pass to |
| fsl_destroy_mc_io(). |
| |
| This patch needs rework to apply to kernels older than v5.15. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49711 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.8 with commit f93627146f0e371093966ed3d44c065aa077cfb1 and fixed in 5.15.49 with commit ccd1751092341ac120a961835211f9f2e3735963 |
| Issue introduced in 4.8 with commit f93627146f0e371093966ed3d44c065aa077cfb1 and fixed in 5.18.6 with commit 161b68b0a728377aaa10a8e14c70e7734f3c9ff7 |
| Issue introduced in 4.8 with commit f93627146f0e371093966ed3d44c065aa077cfb1 and fixed in 5.19 with commit 928ea98252ad75118950941683893cf904541da9 |
| |
| 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-2022-49711 |
| 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/fsl-mc/fsl-mc-bus.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/ccd1751092341ac120a961835211f9f2e3735963 |
| https://git.kernel.org/stable/c/161b68b0a728377aaa10a8e14c70e7734f3c9ff7 |
| https://git.kernel.org/stable/c/928ea98252ad75118950941683893cf904541da9 |
