| 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-2024-36932: thermal/debugfs: Prevent use-after-free from occurring after cdev removal |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| thermal/debugfs: Prevent use-after-free from occurring after cdev removal |
| |
| Since thermal_debug_cdev_remove() does not run under cdev->lock, it can |
| run in parallel with thermal_debug_cdev_state_update() and it may free |
| the struct thermal_debugfs object used by the latter after it has been |
| checked against NULL. |
| |
| If that happens, thermal_debug_cdev_state_update() will access memory |
| that has been freed already causing the kernel to crash. |
| |
| Address this by using cdev->lock in thermal_debug_cdev_remove() around |
| the cdev->debugfs value check (in case the same cdev is removed at the |
| same time in two different threads) and its reset to NULL. |
| |
| Cc :6.8+ <stable@vger.kernel.org> # 6.8+ |
| |
| The Linux kernel CVE team has assigned CVE-2024-36932 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 755113d7678681a137c330f7997ceb680adb644e and fixed in 6.8.10 with commit c1279dee33369e2525f532364bb87207d23b9481 |
| Issue introduced in 6.8 with commit 755113d7678681a137c330f7997ceb680adb644e and fixed in 6.9 with commit d351eb0ab04c3e8109895fc33250cebbce9c11da |
| |
| 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-2024-36932 |
| 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/thermal/thermal_debugfs.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/c1279dee33369e2525f532364bb87207d23b9481 |
| https://git.kernel.org/stable/c/d351eb0ab04c3e8109895fc33250cebbce9c11da |
