| 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-2021-47328: scsi: iscsi: Fix conn use after free during resets |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: iscsi: Fix conn use after free during resets |
| |
| If we haven't done a unbind target call we can race where |
| iscsi_conn_teardown wakes up the EH thread and then frees the conn while |
| those threads are still accessing the conn ehwait. |
| |
| We can only do one TMF per session so this just moves the TMF fields from |
| the conn to the session. We can then rely on the |
| iscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session call |
| to remove the target and it's devices, and know after that point there is |
| no device or scsi-ml callout trying to access the session. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47328 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.19.198 with commit bf20d85a88384574fabb3d53ad62a8af57e7ab11 |
| Fixed in 5.4.134 with commit d04958a348e560938410e04a12fb99da9c7e6a00 |
| Fixed in 5.10.52 with commit 89812e7957ab0746eab66ed6fc49d52bb4dca250 |
| Fixed in 5.12.19 with commit f0a031f7c55ffd944fead1ddaf2aa94df9a158c1 |
| Fixed in 5.13.4 with commit fa9542b35ceb4202e8f8d65f440529a63524dca9 |
| Fixed in 5.14 with commit ec29d0ac29be366450a7faffbcf8cba3a6a3b506 |
| |
| 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-2021-47328 |
| 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/scsi/libiscsi.c |
| include/scsi/libiscsi.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/bf20d85a88384574fabb3d53ad62a8af57e7ab11 |
| https://git.kernel.org/stable/c/d04958a348e560938410e04a12fb99da9c7e6a00 |
| https://git.kernel.org/stable/c/89812e7957ab0746eab66ed6fc49d52bb4dca250 |
| https://git.kernel.org/stable/c/f0a031f7c55ffd944fead1ddaf2aa94df9a158c1 |
| https://git.kernel.org/stable/c/fa9542b35ceb4202e8f8d65f440529a63524dca9 |
| https://git.kernel.org/stable/c/ec29d0ac29be366450a7faffbcf8cba3a6a3b506 |
