| 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-2022-49418: NFSv4: Fix free of uninitialized nfs4_label on referral lookup. |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| NFSv4: Fix free of uninitialized nfs4_label on referral lookup. |
| |
| Send along the already-allocated fattr along with nfs4_fs_locations, and |
| drop the memcpy of fattr. We end up growing two more allocations, but this |
| fixes up a crash as: |
| |
| PID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: "ls" |
| #0 [ffffc90000857920] panic at ffffffff81b9bfde |
| #1 [ffffc900008579c0] do_trap at ffffffff81023a9b |
| #2 [ffffc90000857a10] do_error_trap at ffffffff81023b78 |
| #3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45 |
| #4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de |
| #5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs] |
| #6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f |
| #7 [ffffc90000857c60] walk_component at ffffffff813a86c4 |
| #8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553 |
| #9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b |
| |
| The Linux kernel CVE team has assigned CVE-2022-49418 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit 9558a007dbc383d48e7f5a123d0b5ff656c71068 and fixed in 5.15.77 with commit eb1fe9600b86c24a789046bfc5c6851dda119280 |
| Issue introduced in 5.16 with commit 9558a007dbc383d48e7f5a123d0b5ff656c71068 and fixed in 5.18.3 with commit 6015292653d95ba9f72906e2b65e536aa5807d64 |
| Issue introduced in 5.16 with commit 9558a007dbc383d48e7f5a123d0b5ff656c71068 and fixed in 5.19 with commit c3ed222745d9ad7b69299b349a64ba533c64a34f |
| |
| 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-2022-49418 |
| 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/nfs/nfs4namespace.c |
| fs/nfs/nfs4proc.c |
| fs/nfs/nfs4state.c |
| fs/nfs/nfs4xdr.c |
| include/linux/nfs_xdr.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/eb1fe9600b86c24a789046bfc5c6851dda119280 |
| https://git.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64 |
| https://git.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f |
