| 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-2021-47427: scsi: iscsi: Fix iscsi_task use after free |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: iscsi: Fix iscsi_task use after free |
| |
| Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") |
| added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but |
| then also changed the handling of the case where we detect an already |
| completed task where we now end up doing a goto to the common put/cleanup |
| code. This results in a iscsi_task use after free, because the common |
| cleanup code will do a put on the iscsi_task. |
| |
| This reverts the goto and moves the iscsi_get_conn() to after we've checked |
| if the iscsi_task is valid. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47427 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit d39df158518ccc3bf24ee18082b5e100c8f014aa and fixed in 5.14.12 with commit 1642f51ac0d4f2b55d5748094c49ff8f7191b93c |
| Issue introduced in 5.14 with commit d39df158518ccc3bf24ee18082b5e100c8f014aa and fixed in 5.15 with commit 258aad75c62146453d03028a44f2f1590d58e1f6 |
| |
| 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-2021-47427 |
| 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 |
| |
| |
| 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/1642f51ac0d4f2b55d5748094c49ff8f7191b93c |
| https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6 |
