| 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-2024-56621: scsi: ufs: core: Cancel RTC work during ufshcd_remove() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| scsi: ufs: core: Cancel RTC work during ufshcd_remove() |
| |
| Currently, RTC work is only cancelled during __ufshcd_wl_suspend(). When |
| ufshcd is removed in ufshcd_remove(), RTC work is not cancelled. Due to |
| this, any further trigger of the RTC work after ufshcd_remove() would |
| result in a NULL pointer dereference as below: |
| |
| Unable to handle kernel NULL pointer dereference at virtual address 00000000000002a4 |
| Workqueue: events ufshcd_rtc_work |
| Call trace: |
| _raw_spin_lock_irqsave+0x34/0x8c |
| pm_runtime_get_if_active+0x24/0xb4 |
| ufshcd_rtc_work+0x124/0x19c |
| process_scheduled_works+0x18c/0x2d8 |
| worker_thread+0x144/0x280 |
| kthread+0x11c/0x128 |
| ret_from_fork+0x10/0x20 |
| |
| Since RTC work accesses the ufshcd internal structures, it should be cancelled |
| when ufshcd is removed. So do that in ufshcd_remove(), as per the order in |
| ufshcd_init(). |
| |
| The Linux kernel CVE team has assigned CVE-2024-56621 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 6bf999e0eb41850d5c857102535d5c53b2ede224 and fixed in 6.12.5 with commit 2e7a3bb0331efb292e0fb022c36bc592137f0520 |
| Issue introduced in 6.8 with commit 6bf999e0eb41850d5c857102535d5c53b2ede224 and fixed in 6.13 with commit 1695c4361d35b7bdadd7b34f99c9c07741e181e5 |
| |
| 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-2024-56621 |
| 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/ufs/core/ufshcd.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/57479e37d3f69efee2f0678568274db773284bc8 |
| https://git.kernel.org/stable/c/2e7a3bb0331efb292e0fb022c36bc592137f0520 |
| https://git.kernel.org/stable/c/1695c4361d35b7bdadd7b34f99c9c07741e181e5 |
