| 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-2025-21994: ksmbd: fix incorrect validation for num_aces field of smb_acl |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: fix incorrect validation for num_aces field of smb_acl |
| |
| parse_dcal() validate num_aces to allocate posix_ace_state_array. |
| |
| if (num_aces > ULONG_MAX / sizeof(struct smb_ace *)) |
| |
| It is an incorrect validation that we can create an array of size ULONG_MAX. |
| smb_acl has ->size field to calculate actual number of aces in request buffer |
| size. Use this to check invalid num_aces. |
| |
| The Linux kernel CVE team has assigned CVE-2025-21994 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 5.15.180 with commit c3a3484d9d31b27a3db0fab91fcf191132d65236 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.1.132 with commit 9c4e202abff45f8eac17989e549fc7a75095f675 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.6.85 with commit d0f87370622a853b57e851f7d5a5452b72300f19 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.21 with commit a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.13.9 with commit f6a6721802ac2f12f4c1bbe839a4c229b61866f2 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14 with commit 1b8b67f3c5e5169535e26efedd3e422172e2db64 |
| |
| 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-2025-21994 |
| 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/smbacl.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/c3a3484d9d31b27a3db0fab91fcf191132d65236 |
| https://git.kernel.org/stable/c/9c4e202abff45f8eac17989e549fc7a75095f675 |
| https://git.kernel.org/stable/c/d0f87370622a853b57e851f7d5a5452b72300f19 |
| https://git.kernel.org/stable/c/a4cb17797a5d241f1e509cb5b46ed95a80c2f5fd |
| https://git.kernel.org/stable/c/f6a6721802ac2f12f4c1bbe839a4c229b61866f2 |
| https://git.kernel.org/stable/c/1b8b67f3c5e5169535e26efedd3e422172e2db64 |
