| 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-2025-21955: ksmbd: prevent connection release during oplock break notification |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: prevent connection release during oplock break notification |
| |
| ksmbd_work could be freed when after connection release. |
| Increment r_count of ksmbd_conn to indicate that requests |
| are not finished yet and to not release the connection. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21955 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.6.84 with commit 09aeab68033161cb54f194da93e51a11aee6144b |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.20 with commit a4261bbc33fbf99b99c80aa3a2c5097611802980 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.13.8 with commit f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14 with commit 3aa660c059240e0c795217182cf7df32909dd917 |
| |
| 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-2025-21955 |
| 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: |
| fs/smb/server/connection.c |
| fs/smb/server/connection.h |
| fs/smb/server/oplock.c |
| fs/smb/server/server.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/09aeab68033161cb54f194da93e51a11aee6144b |
| https://git.kernel.org/stable/c/a4261bbc33fbf99b99c80aa3a2c5097611802980 |
| https://git.kernel.org/stable/c/f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa |
| https://git.kernel.org/stable/c/3aa660c059240e0c795217182cf7df32909dd917 |
