| 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-2021-47459: can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv |
| |
| It will trigger UAF for rx_kref of j1939_priv as following. |
| |
| cpu0 cpu1 |
| j1939_sk_bind(socket0, ndev0, ...) |
| j1939_netdev_start |
| j1939_sk_bind(socket1, ndev0, ...) |
| j1939_netdev_start |
| j1939_priv_set |
| j1939_priv_get_by_ndev_locked |
| j1939_jsk_add |
| ..... |
| j1939_netdev_stop |
| kref_put_lock(&priv->rx_kref, ...) |
| kref_get(&priv->rx_kref, ...) |
| REFCOUNT_WARN("addition on 0;...") |
| |
| ==================================================== |
| refcount_t: addition on 0; use-after-free. |
| WARNING: CPU: 1 PID: 20874 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0 |
| RIP: 0010:refcount_warn_saturate+0x169/0x1e0 |
| Call Trace: |
| j1939_netdev_start+0x68b/0x920 |
| j1939_sk_bind+0x426/0xeb0 |
| ? security_socket_bind+0x83/0xb0 |
| |
| The rx_kref's kref_get() and kref_put() should use j1939_netdev_lock to |
| protect. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47459 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.4 with commit 9d71dd0c70099914fcd063135da3c580865e924c and fixed in 5.4.156 with commit a0e47d2833b4f65e6c799f28c6b636d36b8b936d |
| Issue introduced in 5.4 with commit 9d71dd0c70099914fcd063135da3c580865e924c and fixed in 5.10.76 with commit 864e77771a24c877aaf53aee019f78619cbcd668 |
| Issue introduced in 5.4 with commit 9d71dd0c70099914fcd063135da3c580865e924c and fixed in 5.14.15 with commit 6e8811707e2df0c6ba920f0cad3a3bca7b42132f |
| Issue introduced in 5.4 with commit 9d71dd0c70099914fcd063135da3c580865e924c and fixed in 5.15 with commit d9d52a3ebd284882f5562c88e55991add5d01586 |
| |
| 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-2021-47459 |
| 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/can/j1939/main.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/a0e47d2833b4f65e6c799f28c6b636d36b8b936d |
| https://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668 |
| https://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132f |
| https://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586 |
