| From bippy-1.1.0 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-2022-49905: net/smc: Fix possible leaked pernet namespace in smc_init() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net/smc: Fix possible leaked pernet namespace in smc_init() |
| |
| In smc_init(), register_pernet_subsys(&smc_net_stat_ops) is called |
| without any error handling. |
| If it fails, registering of &smc_net_ops won't be reverted. |
| And if smc_nl_init() fails, &smc_net_stat_ops itself won't be reverted. |
| |
| This leaves wild ops in subsystem linkedlist and when another module |
| tries to call register_pernet_operations() it triggers page fault: |
| |
| BUG: unable to handle page fault for address: fffffbfff81b964c |
| RIP: 0010:register_pernet_operations+0x1b9/0x5f0 |
| Call Trace: |
| <TASK> |
| register_pernet_subsys+0x29/0x40 |
| ebtables_init+0x58/0x1000 [ebtables] |
| ... |
| |
| The Linux kernel CVE team has assigned CVE-2022-49905 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit 194730a9beb52d2b030ea45e12d94868d4a0e6fd and fixed in 5.15.78 with commit 61defd6450a9ef4a1487090449999b0fd83518ef |
| Issue introduced in 5.14 with commit 194730a9beb52d2b030ea45e12d94868d4a0e6fd and fixed in 6.0.8 with commit c97daf836f7caf81d3144b8cd2b2a51f9bc3bd09 |
| Issue introduced in 5.14 with commit 194730a9beb52d2b030ea45e12d94868d4a0e6fd and fixed in 6.1 with commit 62ff373da2534534c55debe6c724c7fe14adb97f |
| |
| 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-2022-49905 |
| 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: |
| net/smc/af_smc.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/61defd6450a9ef4a1487090449999b0fd83518ef |
| https://git.kernel.org/stable/c/c97daf836f7caf81d3144b8cd2b2a51f9bc3bd09 |
| https://git.kernel.org/stable/c/62ff373da2534534c55debe6c724c7fe14adb97f |
