CVE-2017-12190
Medium
Description
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.
SeverityMedium
CVSS6.5
Exploit probability—
Product
Linux Kernel
PublishedNov 22, 2017
First seenNov 22, 2017
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Vendor advisories
- usn.ubuntu.com/3583-2/
- access.redhat.com/errata/RHSA-2018:1854
- usn.ubuntu.com/3582-1/
- access.redhat.com/errata/RHSA-2018:1062
- access.redhat.com/errata/RHSA-2018:0654
- usn.ubuntu.com/3583-1/
- access.redhat.com/errata/RHSA-2018:0676
- usn.ubuntu.com/3582-2/
- access.redhat.com/errata/RHSA-2019:1170
- access.redhat.com/errata/RHSA-2019:1190
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v ≤ 4.13.7 | — |
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