kernel: Use-after-free in __blk_drain_queue() function in block/blk-core.c
Published Jul 26, 2019
7.8
HIGHCVSS 3.0
EPSS 0.71%
Description
An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.
Affected products
No data.
- < 4.18.7
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-1062.4.1.el7
Fixed · RHSA-2019:3055
Red Hat Enterprise Linux 7
kernel-alt-0:4.14.0-115.14.1.el7a
Fixed · RHSA-2019:3217
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-1062.4.1.rt56.1027.el7
Fixed · RHSA-2019:3089
Red Hat Enterprise Linux 7
kpatch-patch
Fixed · RHSA-2019:3076
Red Hat Enterprise Linux 7.4 Advanced Update Support
kernel-0:3.10.0-693.62.1.el7
Fixed · RHSA-2020:0103
Red Hat Enterprise Linux 7.4 Telco Extended Update Support
kernel-0:3.10.0-693.62.1.el7
Fixed · RHSA-2020:0103
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
kernel-0:3.10.0-693.62.1.el7
Fixed · RHSA-2020:0103
Red Hat Enterprise Linux 7.5 Extended Update Support
kernel-0:3.10.0-862.48.1.el7
Fixed · RHSA-2020:0543
Red Hat Enterprise Linux 7.6 Extended Update Support
kernel-0:3.10.0-957.46.1.el7
Fixed · RHSA-2020:0664
Red Hat Enterprise Linux 7.6 Extended Update Support
kpatch-patch
Fixed · RHSA-2020:0698
Red Hat Enterprise MRG 2
kernel-rt-1:3.10.0-693.62.1.rt56.659.el6rt
Fixed · RHSA-2020:0100
Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS
kernel-0:3.10.0-957.46.1.el7
Fixed · RHSA-2020:0664
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-1062.4.1.el7 | Fixed | RHSA-2019:3055 |
| Red Hat Enterprise Linux 7 | kernel-alt-0:4.14.0-115.14.1.el7a | Fixed | RHSA-2019:3217 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-1062.4.1.rt56.1027.el7 | Fixed | RHSA-2019:3089 |
| Red Hat Enterprise Linux 7 | kpatch-patch | Fixed | RHSA-2019:3076 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | kernel-0:3.10.0-693.62.1.el7 | Fixed | RHSA-2020:0103 |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | kernel-0:3.10.0-693.62.1.el7 | Fixed | RHSA-2020:0103 |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | kernel-0:3.10.0-693.62.1.el7 | Fixed | RHSA-2020:0103 |
| Red Hat Enterprise Linux 7.5 Extended Update Support | kernel-0:3.10.0-862.48.1.el7 | Fixed | RHSA-2020:0543 |
| Red Hat Enterprise Linux 7.6 Extended Update Support | kernel-0:3.10.0-957.46.1.el7 | Fixed | RHSA-2020:0664 |
| Red Hat Enterprise Linux 7.6 Extended Update Support | kpatch-patch | Fixed | RHSA-2020:0698 |
| Red Hat Enterprise MRG 2 | kernel-rt-1:3.10.0-693.62.1.rt56.659.el6rt | Fixed | RHSA-2020:0100 |
| Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS | kernel-0:3.10.0-957.46.1.el7 | Fixed | RHSA-2020:0664 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
AV:L/AC:L/Au:N/C:P/I:P/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.71% (0.00707) | 51.69th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.71% (0.00707) | 48.38th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.03% (0.00030) | 5.52th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00064) | 30.08th | v3 (v2023.03.01) |
| Jul 19, 2024 | 0.06% (0.00064) | 28.52th | v3 (v2023.03.01) |
| May 8, 2024 | 0.05% (0.00046) | 16.07th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00046) | 14.04th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.55% (0.01547) | 74.98th | v2 (v2022.01.01) |
| Feb 23, 2023 | 1.55% (0.01547) | 74.94th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.55% (0.01547) | 72.92th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.55% (0.01547) | 51.82th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.05% (0.05048) | 78.60th | v1 |
| Jan 6, 2022 | 5.05% (0.05048) | 78.39th | v1 |
| Sep 1, 2021 | 5.05% (0.05048) | 88.14th | v1 |
| Apr 14, 2021 | 5.05% (0.05048) | 0.00th | v1 |
References (28)
- http://packetstormsecurity.com/files/154059/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html x_refsource_MISC
- http://packetstormsecurity.com/files/154408/Kernel-Live-Patch-Security-Notice-LSN-0055-1.html x_refsource_MISC
- http://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html x_refsource_MISC
- https://access.redhat.com/errata/RHSA-2019:3055 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2019:3076 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2019:3089 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2019:3217 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0100 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0103 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0543 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0664 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2020:0698 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2018-20856 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1738705 Issue Tracking
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.7 x_refsource_MISCMailing ListRelease NotesVendor Advisory
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54648cf1ec2d7f4b6a71767799c45676a138ca24 x_refsource_MISCMailing ListPatchVendor Advisory
- https://github.com/torvalds/linux/commit/54648cf1ec2d7f4b6a71767799c45676a138ca24 x_refsource_MISCPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2018-20856
- https://seclists.org/bugtraq/2019/Aug/18 mailing-listx_refsource_BUGTRAQ
- https://seclists.org/bugtraq/2019/Aug/26 mailing-listx_refsource_BUGTRAQ
- https://security.netapp.com/advisory/ntap-20190905-0002/ x_refsource_CONFIRM
- https://support.f5.com/csp/article/K14673240?utm_source=f5support&%3Butm_medium=RSS x_refsource_CONFIRM
- https://usn.ubuntu.com/4094-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4116-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/4118-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2018-20856
- https://www.debian.org/security/2019/dsa-4497 vendor-advisoryx_refsource_DEBIAN
Change history (0)
No recorded changes yet.