CVE-2017-12190
4.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
6.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
6.5 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
28.1%
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.
Affected configurations
References
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467
seclists.org/oss-sec/2017/q4/52
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.8
www.securityfocus.com/bid/101911
access.redhat.com/errata/RHSA-2018:0654
access.redhat.com/errata/RHSA-2018:0676
access.redhat.com/errata/RHSA-2018:1062
access.redhat.com/errata/RHSA-2018:1854
access.redhat.com/errata/RHSA-2019:1170
access.redhat.com/errata/RHSA-2019:1190
bugzilla.redhat.com/show_bug.cgi?id=1495089
github.com/torvalds/linux/commit/2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058
github.com/torvalds/linux/commit/95d78c28b5a85bacbc29b8dba7c04babb9b0d467
lists.debian.org/debian-lts-announce/2017/12/msg00004.html
support.f5.com/csp/article/K93472064?utm_source=f5support&%3Butm_medium=RSS
usn.ubuntu.com/3582-1/
usn.ubuntu.com/3582-2/
usn.ubuntu.com/3583-1/
usn.ubuntu.com/3583-2/
Related
4.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
6.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
6.5 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
28.1%