| 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-2024-50059: ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ntb: ntb_hw_switchtec: Fix use after free vulnerability in switchtec_ntb_remove due to race condition |
| |
| In the switchtec_ntb_add function, it can call switchtec_ntb_init_sndev |
| function, then &sndev->check_link_status_work is bound with |
| check_link_status_work. switchtec_ntb_link_notification may be called |
| to start the work. |
| |
| If we remove the module which will call switchtec_ntb_remove to make |
| cleanup, it will free sndev through kfree(sndev), while the work |
| mentioned above will be used. The sequence of operations that may lead |
| to a UAF bug is as follows: |
| |
| CPU0 CPU1 |
| |
| | check_link_status_work |
| switchtec_ntb_remove | |
| kfree(sndev); | |
| | if (sndev->link_force_down) |
| | // use sndev |
| |
| Fix it by ensuring that the work is canceled before proceeding with |
| the cleanup in switchtec_ntb_remove. |
| |
| The Linux kernel CVE team has assigned CVE-2024-50059 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.4.285 with commit 5126d8f5567f49b52e21fca320eaa97977055099 |
| Fixed in 5.10.227 with commit b650189687822b705711f0567a65a164a314d8df |
| Fixed in 5.15.168 with commit 92728fceefdaa2a0a3aae675f86193b006eeaa43 |
| Fixed in 6.1.113 with commit 3ae45be8492460a35b5aebf6acac1f1d32708946 |
| Fixed in 6.6.57 with commit fa840ba4bd9f3bad7f104e5b32028ee73af8b3dd |
| Fixed in 6.11.4 with commit 177925d9c8715a897bb79eca62628862213ba956 |
| Fixed in 6.12 with commit e51aded92d42784313ba16c12f4f88cc4f973bbb |
| |
| 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-2024-50059 |
| 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/ntb/hw/mscc/ntb_hw_switchtec.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/5126d8f5567f49b52e21fca320eaa97977055099 |
| https://git.kernel.org/stable/c/b650189687822b705711f0567a65a164a314d8df |
| https://git.kernel.org/stable/c/92728fceefdaa2a0a3aae675f86193b006eeaa43 |
| https://git.kernel.org/stable/c/3ae45be8492460a35b5aebf6acac1f1d32708946 |
| https://git.kernel.org/stable/c/fa840ba4bd9f3bad7f104e5b32028ee73af8b3dd |
| https://git.kernel.org/stable/c/177925d9c8715a897bb79eca62628862213ba956 |
| https://git.kernel.org/stable/c/e51aded92d42784313ba16c12f4f88cc4f973bbb |
