| 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-2025-21967: ksmbd: fix use-after-free in ksmbd_free_work_struct |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: fix use-after-free in ksmbd_free_work_struct |
| |
| ->interim_entry of ksmbd_work could be deleted after oplock is freed. |
| We don't need to manage it with linked list. The interim request could be |
| immediately sent whenever a oplock break wait is needed. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21967 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.6.84 with commit fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.20 with commit 62746ae3f5414244a96293e3b017be637b641280 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.13.8 with commit eb51f6f59d19b92f6fe84d3873f958495ab32f0a |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14 with commit bb39ed47065455604729404729d9116868638d31 |
| |
| 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-2025-21967 |
| 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/ksmbd_work.c |
| fs/smb/server/ksmbd_work.h |
| fs/smb/server/oplock.c |
| fs/smb/server/oplock.h |
| |
| |
| 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/fb776765bfc21d5e4ed03bb3d4406c2b86ff1ac3 |
| https://git.kernel.org/stable/c/62746ae3f5414244a96293e3b017be637b641280 |
| https://git.kernel.org/stable/c/eb51f6f59d19b92f6fe84d3873f958495ab32f0a |
| https://git.kernel.org/stable/c/bb39ed47065455604729404729d9116868638d31 |
