| From bippy-5f407fcff5a0 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-2024-40938: landlock: Fix d_parent walk |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| landlock: Fix d_parent walk |
| |
| The WARN_ON_ONCE() in collect_domain_accesses() can be triggered when |
| trying to link a root mount point. This cannot work in practice because |
| this directory is mounted, but the VFS check is done after the call to |
| security_path_link(). |
| |
| Do not use source directory's d_parent when the source directory is the |
| mount point. |
| |
| [mic: Fix commit message] |
| |
| The Linux kernel CVE team has assigned CVE-2024-40938 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.19 with commit b91c3e4ea756b12b7d992529226edce1cfd854d7 and fixed in 6.1.95 with commit b6e5e696435832b33e40775f060ef5c95f4fda1f |
| Issue introduced in 5.19 with commit b91c3e4ea756b12b7d992529226edce1cfd854d7 and fixed in 6.6.35 with commit cc30d05b34f9a087a6928d09b131f7b491e9ab11 |
| Issue introduced in 5.19 with commit b91c3e4ea756b12b7d992529226edce1cfd854d7 and fixed in 6.9.6 with commit c7618c7b0b8c45bcef34410cc1d1e953eb17f8f6 |
| Issue introduced in 5.19 with commit b91c3e4ea756b12b7d992529226edce1cfd854d7 and fixed in 6.10 with commit 88da52ccd66e65f2e63a6c35c9dff55d448ef4dc |
| |
| 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-2024-40938 |
| 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: |
| security/landlock/fs.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/b6e5e696435832b33e40775f060ef5c95f4fda1f |
| https://git.kernel.org/stable/c/cc30d05b34f9a087a6928d09b131f7b491e9ab11 |
| https://git.kernel.org/stable/c/c7618c7b0b8c45bcef34410cc1d1e953eb17f8f6 |
| https://git.kernel.org/stable/c/88da52ccd66e65f2e63a6c35c9dff55d448ef4dc |
