| 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-2024-46690: nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| nfsd: fix nfsd4_deleg_getattr_conflict in presence of third party lease |
| |
| It is not safe to dereference fl->c.flc_owner without first confirming |
| fl->fl_lmops is the expected manager. nfsd4_deleg_getattr_conflict() |
| tests fl_lmops but largely ignores the result and assumes that flc_owner |
| is an nfs4_delegation anyway. This is wrong. |
| |
| With this patch we restore the "!= &nfsd_lease_mng_ops" case to behave |
| as it did before the change mentioned below. This is the same as the |
| current code, but without any reference to a possible delegation. |
| |
| The Linux kernel CVE team has assigned CVE-2024-46690 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.9 with commit c5967721e1063648b0506481585ba7e2e49a075e and fixed in 6.10.8 with commit 1b46a871e980e3daa16fd5e77539966492e8910a |
| Issue introduced in 6.9 with commit c5967721e1063648b0506481585ba7e2e49a075e and fixed in 6.11 with commit 40927f3d0972bf86357a32a5749be71a551241b6 |
| |
| 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-2024-46690 |
| 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/nfsd/nfs4state.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/1b46a871e980e3daa16fd5e77539966492e8910a |
| https://git.kernel.org/stable/c/40927f3d0972bf86357a32a5749be71a551241b6 |
