| 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-2023-52439: uio: Fix use-after-free in uio_open |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| uio: Fix use-after-free in uio_open |
| |
| core-1 core-2 |
| ------------------------------------------------------- |
| uio_unregister_device uio_open |
| idev = idr_find() |
| device_unregister(&idev->dev) |
| put_device(&idev->dev) |
| uio_device_release |
| get_device(&idev->dev) |
| kfree(idev) |
| uio_free_minor(minor) |
| uio_release |
| put_device(&idev->dev) |
| kfree(idev) |
| ------------------------------------------------------- |
| |
| In the core-1 uio_unregister_device(), the device_unregister will kfree |
| idev when the idev->dev kobject ref is 1. But after core-1 |
| device_unregister, put_device and before doing kfree, the core-2 may |
| get_device. Then: |
| 1. After core-1 kfree idev, the core-2 will do use-after-free for idev. |
| 2. When core-2 do uio_release and put_device, the idev will be double |
| freed. |
| |
| To address this issue, we can get idev atomic & inc idev reference with |
| minor_lock. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52439 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 4.19.306 with commit 3174e0f7de1ba392dc191625da83df02d695b60c |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 5.4.268 with commit e93da893d52d82d57fc0db2ca566024e0f26ff50 |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 5.10.209 with commit 5e0be1229ae199ebb90b33102f74a0f22d152570 |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 5.15.148 with commit 5cf604ee538ed0c467abe3b4cda5308a6398f0f7 |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 6.1.74 with commit 17a8519cb359c3b483fb5c7367efa9a8a508bdea |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 6.6.13 with commit 35f102607054faafe78d2a6994b18d5d9d6e92ad |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 6.7.1 with commit 913205930da6213305616ac539447702eaa85e41 |
| Issue introduced in 4.18 with commit 57c5f4df0a5a0ee83df799991251e2ee93a5e4e9 and fixed in 6.8 with commit 0c9ae0b8605078eafc3bea053cc78791e97ba2e2 |
| Issue introduced in 4.14.100 with commit 13af019c87f2d90e663742cb1a819834048842ae |
| |
| 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-2023-52439 |
| 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/uio/uio.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/3174e0f7de1ba392dc191625da83df02d695b60c |
| https://git.kernel.org/stable/c/e93da893d52d82d57fc0db2ca566024e0f26ff50 |
| https://git.kernel.org/stable/c/5e0be1229ae199ebb90b33102f74a0f22d152570 |
| https://git.kernel.org/stable/c/5cf604ee538ed0c467abe3b4cda5308a6398f0f7 |
| https://git.kernel.org/stable/c/17a8519cb359c3b483fb5c7367efa9a8a508bdea |
| https://git.kernel.org/stable/c/35f102607054faafe78d2a6994b18d5d9d6e92ad |
| https://git.kernel.org/stable/c/913205930da6213305616ac539447702eaa85e41 |
| https://git.kernel.org/stable/c/0c9ae0b8605078eafc3bea053cc78791e97ba2e2 |
