| 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-2024-56764: ublk: detach gendisk from ublk device if add_disk() fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ublk: detach gendisk from ublk device if add_disk() fails |
| |
| Inside ublk_abort_requests(), gendisk is grabbed for aborting all |
| inflight requests. And ublk_abort_requests() is called when exiting |
| the uring context or handling timeout. |
| |
| If add_disk() fails, the gendisk may have been freed when calling |
| ublk_abort_requests(), so use-after-free can be caused when getting |
| disk's reference in ublk_abort_requests(). |
| |
| Fixes the bug by detaching gendisk from ublk device if add_disk() fails. |
| |
| The Linux kernel CVE team has assigned CVE-2024-56764 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.7 with commit bd23f6c2c2d00518e2f27f2d25cef795de9bee56 and fixed in 6.12.8 with commit 7d680f2f76a3417fdfc3946da7471e81464f7b41 |
| Issue introduced in 6.7 with commit bd23f6c2c2d00518e2f27f2d25cef795de9bee56 and fixed in 6.13 with commit 75cd4005da5492129917a4a4ee45e81660556104 |
| |
| 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-2024-56764 |
| 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/block/ublk_drv.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/7d680f2f76a3417fdfc3946da7471e81464f7b41 |
| https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104 |
