| 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-2022-49582: net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering |
| |
| The "ds" iterator variable used in dsa_port_reset_vlan_filtering() -> |
| dsa_switch_for_each_port() overwrites the "dp" received as argument, |
| which is later used to call dsa_port_vlan_filtering() proper. |
| |
| As a result, switches which do enter that code path (the ones with |
| vlan_filtering_is_global=true) will dereference an invalid dp in |
| dsa_port_reset_vlan_filtering() after leaving a VLAN-aware bridge. |
| |
| Use a dedicated "other_dp" iterator variable to avoid this from |
| happening. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49582 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.16 with commit d0004a020bb50263de0e3e775c7b7c7a003e0e0c and fixed in 5.18.15 with commit 3240e12fe203a3a79b9814e83327106b770ed7b0 |
| Issue introduced in 5.16 with commit d0004a020bb50263de0e3e775c7b7c7a003e0e0c and fixed in 5.19 with commit 1699b4d502eda3c7ea4070debad3ee570b5091b1 |
| |
| 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-2022-49582 |
| 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/dsa/port.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/3240e12fe203a3a79b9814e83327106b770ed7b0 |
| https://git.kernel.org/stable/c/1699b4d502eda3c7ea4070debad3ee570b5091b1 |
