| 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-2022-48861: vdpa: fix use-after-free on vp_vdpa_remove |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| vdpa: fix use-after-free on vp_vdpa_remove |
| |
| When vp_vdpa driver is unbind, vp_vdpa is freed in vdpa_unregister_device |
| and then vp_vdpa->mdev.pci_dev is dereferenced in vp_modern_remove, |
| triggering use-after-free. |
| |
| Call Trace of unbinding driver free vp_vdpa : |
| do_syscall_64 |
| vfs_write |
| kernfs_fop_write_iter |
| device_release_driver_internal |
| pci_device_remove |
| vp_vdpa_remove |
| vdpa_unregister_device |
| kobject_release |
| device_release |
| kfree |
| |
| Call Trace of dereference vp_vdpa->mdev.pci_dev: |
| vp_modern_remove |
| pci_release_selected_regions |
| pci_release_region |
| pci_resource_len |
| pci_resource_end |
| (dev)->resource[(bar)].end |
| |
| The Linux kernel CVE team has assigned CVE-2022-48861 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit 64b9f64f80a6f4b7ea51bf0510119cb15e801dc6 and fixed in 5.15.29 with commit 4b1743bc715a3691a63ac21b349079b07bf1b19e |
| Issue introduced in 5.13 with commit 64b9f64f80a6f4b7ea51bf0510119cb15e801dc6 and fixed in 5.16.15 with commit dc54ba9932aeaaa1a21fe214af1f446593a78274 |
| Issue introduced in 5.13 with commit 64b9f64f80a6f4b7ea51bf0510119cb15e801dc6 and fixed in 5.17 with commit eb057b44dbe35ae14527830236a92f51de8f9184 |
| |
| 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-2022-48861 |
| 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/vdpa/virtio_pci/vp_vdpa.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/4b1743bc715a3691a63ac21b349079b07bf1b19e |
| https://git.kernel.org/stable/c/dc54ba9932aeaaa1a21fe214af1f446593a78274 |
| https://git.kernel.org/stable/c/eb057b44dbe35ae14527830236a92f51de8f9184 |
