| From bippy-1.2.0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@kernel.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2025-22039: ksmbd: fix overflow in dacloffset bounds check |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ksmbd: fix overflow in dacloffset bounds check |
| |
| The dacloffset field was originally typed as int and used in an |
| unchecked addition, which could overflow and bypass the existing |
| bounds check in both smb_check_perm_dacl() and smb_inherit_dacl(). |
| |
| This could result in out-of-bounds memory access and a kernel crash |
| when dereferencing the DACL pointer. |
| |
| This patch converts dacloffset to unsigned int and uses |
| check_add_overflow() to validate access to the DACL. |
| |
| The Linux kernel CVE team has assigned CVE-2025-22039 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.12.23 with commit 6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.13.11 with commit 6b8d379048b168a0dff5ab1acb975b933f368514 |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.14.2 with commit 443b373a4df5a2cb9f7b8c4658b2afedeb16397f |
| Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.15 with commit beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42 |
| |
| 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-2025-22039 |
| 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/6a9cd9ff0fa2bcc30b2bfb8bdb161eb20e44b9dc |
| https://git.kernel.org/stable/c/6b8d379048b168a0dff5ab1acb975b933f368514 |
| https://git.kernel.org/stable/c/443b373a4df5a2cb9f7b8c4658b2afedeb16397f |
| https://git.kernel.org/stable/c/beff0bc9d69bc8e733f9bca28e2d3df5b3e10e42 |
