CVE-2017-12190
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.5%
exploitation probability
0.5%top 57% of all CVEs
observed exploitation
nono source reports it
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 products
n/a · Linux kernel through v4.14-rc5References
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=95d78c28b5a85bacbc29b8dba7c04babb9b0d467https://access.redhat.com/errata/RHSA-2018:0654https://access.redhat.com/errata/RHSA-2018:0676https://access.redhat.com/errata/RHSA-2018:1062https://access.redhat.com/errata/RHSA-2018:1854https://access.redhat.com/errata/RHSA-2019:1170https://access.redhat.com/errata/RHSA-2019:1190https://bugzilla.redhat.com/show_bug.cgi?id=1495089http://seclists.org/oss-sec/2017/q4/52https://github.com/torvalds/linux/commit/2b04e8f6bbb196cab4b232af0f8d48ff2c7a8058https://github.com/torvalds/linux/commit/95d78c28b5a85bacbc29b8dba7c04babb9b0d467