| From bippy-7c5fe7eed585 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-2025-21995: drm/sched: Fix fence reference count leak |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/sched: Fix fence reference count leak |
| |
| The last_scheduled fence leaks when an entity is being killed and adding |
| the cleanup callback fails. |
| |
| Decrement the reference count of prev when dma_fence_add_callback() |
| fails, ensuring proper balance. |
| |
| [phasta: add git tag info for stable kernel] |
| |
| The Linux kernel CVE team has assigned CVE-2025-21995 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.6.85 with commit c76bd3c99293834de7d1dca5de536616d5655e38 |
| Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.12.21 with commit 1135a9431160575466ea9ac37ebd756ecbe35fff |
| Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.13.9 with commit 35399c84dcedd6d31448fb9e1336ef52673f2882 |
| Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.14 with commit a952f1ab696873be124e31ce5ef964d36bce817f |
| |
| 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-2025-21995 |
| 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/scheduler/sched_entity.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/c76bd3c99293834de7d1dca5de536616d5655e38 |
| https://git.kernel.org/stable/c/1135a9431160575466ea9ac37ebd756ecbe35fff |
| https://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882 |
| https://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f |
