| 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-2021-47160: net: dsa: mt7530: fix VLAN traffic leaks |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: dsa: mt7530: fix VLAN traffic leaks |
| |
| PCR_MATRIX field was set to all 1's when VLAN filtering is enabled, but |
| was not reset when it is disabled, which may cause traffic leaks: |
| |
| ip link add br0 type bridge vlan_filtering 1 |
| ip link add br1 type bridge vlan_filtering 1 |
| ip link set swp0 master br0 |
| ip link set swp1 master br1 |
| ip link set br0 type bridge vlan_filtering 0 |
| ip link set br1 type bridge vlan_filtering 0 |
| # traffic in br0 and br1 will start leaking to each other |
| |
| As port_bridge_{add,del} have set up PCR_MATRIX properly, remove the |
| PCR_MATRIX write from mt7530_port_set_vlan_aware. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47160 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 4.16 with commit 83163f7dca5684816d01c8ccf4857aa74801e7b7 and fixed in 4.19.193 with commit ae389812733b1b1e8e07fcc238e41db166b5c78d |
| Issue introduced in 4.16 with commit 83163f7dca5684816d01c8ccf4857aa74801e7b7 and fixed in 5.4.124 with commit 4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488 |
| Issue introduced in 4.16 with commit 83163f7dca5684816d01c8ccf4857aa74801e7b7 and fixed in 5.10.42 with commit b91117b66fe875723a4e79ec6263526fffdb44d2 |
| Issue introduced in 4.16 with commit 83163f7dca5684816d01c8ccf4857aa74801e7b7 and fixed in 5.12.9 with commit 82ae35b6c14feae5f216913d5b433e143c756d4e |
| Issue introduced in 4.16 with commit 83163f7dca5684816d01c8ccf4857aa74801e7b7 and fixed in 5.13 with commit 474a2ddaa192777522a7499784f1d60691cd831a |
| |
| 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-2021-47160 |
| 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: |
| drivers/net/dsa/mt7530.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/ae389812733b1b1e8e07fcc238e41db166b5c78d |
| https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488 |
| https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2 |
| https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e |
| https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a |
