| CVE-2017-12190 | Date: (C)2017-11-29 (M)2024-04-19 |
The bio_map_user_iov and bio_unmap_user functions in block/bio.c in the Linux kernel before 4.13.8 do unbalanced refcounting when a SCSI I/O vector has small consecutive buffers belonging to the same page. The bio_add_pc_page function merges them into one, but the page reference is never dropped. This causes a memory leak and possible system lockup (exploitable against the host OS by a guest OS user, if a SCSI disk is passed through to a virtual machine) due to an out-of-memory condition.
CVSS Score and Metrics +CVSS Score and Metrics -| CVSS V3 Severity: | CVSS V2 Severity: |
| CVSS Score : 6.5 | CVSS Score : 4.9 |
| Exploit Score: 2.0 | Exploit Score: 3.9 |
| Impact Score: 4.0 | Impact Score: 6.9 |
| |
| CVSS V3 Metrics: | CVSS V2 Metrics: |
| Attack Vector: LOCAL | Access Vector: LOCAL |
| Attack Complexity: LOW | Access Complexity: LOW |
| Privileges Required: LOW | Authentication: NONE |
| User Interaction: NONE | Confidentiality: NONE |
| Scope: CHANGED | Integrity: NONE |
| Confidentiality: NONE | Availability: COMPLETE |
| Integrity: NONE | |
| Availability: HIGH | |
| | |
