| 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-2024-49943: drm/xe/guc_submit: add missing locking in wedged_fini |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/xe/guc_submit: add missing locking in wedged_fini |
| |
| Any non-wedged queue can have a zero refcount here and can be running |
| concurrently with an async queue destroy, therefore dereferencing the |
| queue ptr to check wedge status after the lookup can trigger UAF if |
| queue is not wedged. Fix this by keeping the submission_state lock held |
| around the check to postpone the free and make the check safe, before |
| dropping again around the put() to avoid the deadlock. |
| |
| (cherry picked from commit d28af0b6b9580b9f90c265a7da0315b0ad20bbfd) |
| |
| The Linux kernel CVE team has assigned CVE-2024-49943 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.11 with commit 8ed9aaae39f39130b7a3eb2726be05d7f64b344c and fixed in 6.11.3 with commit d88f9bab7e62dd0dbe983fa70cf040042a60cc84 |
| Issue introduced in 6.11 with commit 8ed9aaae39f39130b7a3eb2726be05d7f64b344c and fixed in 6.12 with commit 790533e44bfc7af929842fccd9674c9f424d4627 |
| |
| 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-2024-49943 |
| 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/gpu/drm/xe/xe_guc_submit.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/d88f9bab7e62dd0dbe983fa70cf040042a60cc84 |
| https://git.kernel.org/stable/c/790533e44bfc7af929842fccd9674c9f424d4627 |
