A flaw was found in the Linux kernels block driver implementation where a use-after-free condition could be triggered while draining the outstanding command queue in the systems block device subsystem. A patient local attacker can use this flaw to corrupt memory, possibly crashing the system and possibly leading to privilege escalation. https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7 https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54648cf1ec2d7f4b6a71767799c45676a138ca24 https://github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1738706]
This was fixed in Fedora with the 4.18.7 stable kernel update.
This flaw is rated as important due to possible memory corruption or additional flow on effects.
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:3055 https://access.redhat.com/errata/RHSA-2019:3055
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:3076 https://access.redhat.com/errata/RHSA-2019:3076
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2018-20856
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:3089 https://access.redhat.com/errata/RHSA-2019:3089
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2019:3217 https://access.redhat.com/errata/RHSA-2019:3217
This issue has been addressed in the following products: Red Hat Enterprise MRG 2 Via RHSA-2020:0100 https://access.redhat.com/errata/RHSA-2020:0100
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.4 Advanced Update Support Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions Red Hat Enterprise Linux 7.4 Telco Extended Update Support Via RHSA-2020:0103 https://access.redhat.com/errata/RHSA-2020:0103
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.5 Extended Update Support Via RHSA-2020:0543 https://access.redhat.com/errata/RHSA-2020:0543
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.6 Extended Update Support Via RHSA-2020:0664 https://access.redhat.com/errata/RHSA-2020:0664
This issue has been addressed in the following products: Red Hat Enterprise Linux 7.6 Extended Update Support Via RHSA-2020:0698 https://access.redhat.com/errata/RHSA-2020:0698