DescriptionThe 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.
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
|National Vulnerability Database||SUSE|
|Access Vector||Local||Adjacent Network|
|Access Vector||Adjacent Network|
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification.
|SUSE Linux Enterprise Desktop 12 SP2||kernel-source||Affected|
|SUSE Linux Enterprise Desktop 12 SP3||kernel-source||Affected|
|SUSE Linux Enterprise Server 11 SP3 LTSS||kernel-source||Affected|
|SUSE Linux Enterprise Server 11 SP4||kernel-source||Affected|
|SUSE Linux Enterprise Server 12 GA LTSS||kernel-source||Affected|
|SUSE Linux Enterprise Server 12 SP1 LTSS||kernel-source||Affected|
|SUSE Linux Enterprise Server 12 SP2||kernel-source||Affected|
|SUSE Linux Enterprise Server 12 SP3||kernel-source||Affected|