| From bippy-1.1.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49893: cxl/region: Fix cxl_region leak, cleanup targets at region delete |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| cxl/region: Fix cxl_region leak, cleanup targets at region delete |
| |
| When a region is deleted any targets that have been previously assigned |
| to that region hold references to it. Trigger those references to |
| drop by detaching all targets at unregister_region() time. |
| |
| Otherwise that region object will leak as userspace has lost the ability |
| to detach targets once region sysfs is torn down. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49893 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.0 with commit b9686e8c8e39d4072081ef078c04915ee51c8af4 and fixed in 6.0.8 with commit 45d9fb4b758b9d602ee7776eb6754b0349946aad |
| Issue introduced in 6.0 with commit b9686e8c8e39d4072081ef078c04915ee51c8af4 and fixed in 6.1 with commit 0d9e734018d70cecf79e2e4c6082167160a0f13f |
| |
| 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-2022-49893 |
| 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/cxl/core/region.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/45d9fb4b758b9d602ee7776eb6754b0349946aad |
| https://git.kernel.org/stable/c/0d9e734018d70cecf79e2e4c6082167160a0f13f |
