Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ublk: fix NULL pointer dereference in ublk_ctrl_set_size() ublk_ctrl_set_size() unconditionally dereferences ub->ub_disk via set_capacity_and_notify() without checking if it is NULL. ub->ub_disk is NULL before UBLK_CMD_START_DEV completes (it is only assigned in ublk_ctrl_start_dev()) and after UBLK_CMD_STOP_DEV runs (ublk_detach_disk() sets it to NULL). Since the UBLK_CMD_UPDATE_SIZE handler performs no state validation, a user can trigger a NULL pointer dereference by sending UPDATE_SIZE to a device that has been added but not yet started, or one that has been stopped. Fix this by checking ub->ub_disk under ub->mutex before dereferencing it, and returning -ENODEV if the disk is not available.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 98b995660bff011d8e00af03abd74ac7d1ac1390 before f13fe6794726755a43090cb680c4c58cea6aa5f1; affected 98b995660bff011d8e00af03abd74ac7d1ac1390 before c28d945bfa92e15147e93b73f95345b9bec979b0; affected 98b995660bff011d8e00af03abd74ac7d1ac1390 before 25966fc097691e5c925ad080f64a2f19c5fd940a |
| Linux / Linux | affected 6.16; unaffected 0 before 6.16; unaffected 6.18.20 through 6.18.*; unaffected 6.19.9 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.