| 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-2021-47616: RDMA: Fix use-after-free in rxe_queue_cleanup |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| RDMA: Fix use-after-free in rxe_queue_cleanup |
| |
| On error handling path in rxe_qp_from_init() qp->sq.queue is freed and |
| then rxe_create_qp() will drop last reference to this object. qp clean up |
| function will try to free this queue one time and it causes UAF bug. |
| |
| Fix it by zeroing queue pointer after freeing queue in rxe_qp_from_init(). |
| |
| The Linux kernel CVE team has assigned CVE-2021-47616 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15 with commit 514aee660df493cd673154a6ba6bab745ec47b8c and fixed in 5.15.10 with commit acb53e47db1fbc7cd37ab10b46388f045a76e383 |
| Issue introduced in 5.15 with commit 514aee660df493cd673154a6ba6bab745ec47b8c and fixed in 5.16 with commit 84b01721e8042cdd1e8ffeb648844a09cd4213e0 |
| |
| 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-2021-47616 |
| 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/infiniband/sw/rxe/rxe_qp.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/acb53e47db1fbc7cd37ab10b46388f045a76e383 |
| https://git.kernel.org/stable/c/84b01721e8042cdd1e8ffeb648844a09cd4213e0 |
