kernel: mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c
Published Dec 8, 2019
7.8
HIGHCVSS 3.1
EPSS 3.52%
Description
In the Linux kernel 5.0.21, mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c, related to dump_orphan_list in fs/ext4/super.c.
Affected products
No data.
Configuration 1
- ≥ 2.6.12 · < 3.16.82
- ≥ 3.17 · < 4.4.208
- ≥ 4.5.0 · < 4.9.208
- ≥ 4.10 · < 4.14.159
- ≥ 4.15 · < 4.19.90
- ≥ 4.20 · < 5.3.17
- ≥ 5.4 · < 5.4.4
Configuration 2
- n/a
- n/a
- n/a
- h610s
- n/a
- n/a
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-1160.el7
Fixed · RHSA-2020:4060
Red Hat Enterprise Linux 7
kernel-alt-0:4.14.0-115.21.2.el7a
Fixed · RHSA-2020:2104
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-1160.rt56.1131.el7
Fixed · RHSA-2020:4062
Red Hat Enterprise Linux 7.4 Advanced Update Support
kernel-0:3.10.0-693.81.1.el7
Fixed · RHSA-2020:5430
Red Hat Enterprise Linux 7.4 Telco Extended Update Support
kernel-0:3.10.0-693.81.1.el7
Fixed · RHSA-2020:5430
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
kernel-0:3.10.0-693.81.1.el7
Fixed · RHSA-2020:5430
Red Hat Enterprise Linux 7.6 Extended Update Support
kernel-0:3.10.0-957.65.1.el7
Fixed · RHSA-2020:5656
Red Hat Enterprise Linux 7.7 Extended Update Support
kernel-0:3.10.0-1062.40.1.el7
Fixed · RHSA-2020:5206
Red Hat Enterprise Linux 8
kernel-0:4.18.0-240.el8
Fixed · RHSA-2020:4431
Red Hat Enterprise Linux 8
kernel-rt-0:4.18.0-240.rt7.54.el8
Fixed · RHSA-2020:4609
Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS
kernel-0:3.10.0-957.65.1.el7
Fixed · RHSA-2020:5656
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise MRG 2
kernel
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-1160.el7 | Fixed | RHSA-2020:4060 |
| Red Hat Enterprise Linux 7 | kernel-alt-0:4.14.0-115.21.2.el7a | Fixed | RHSA-2020:2104 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-1160.rt56.1131.el7 | Fixed | RHSA-2020:4062 |
| Red Hat Enterprise Linux 7.4 Advanced Update Support | kernel-0:3.10.0-693.81.1.el7 | Fixed | RHSA-2020:5430 |
| Red Hat Enterprise Linux 7.4 Telco Extended Update Support | kernel-0:3.10.0-693.81.1.el7 | Fixed | RHSA-2020:5430 |
| Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | kernel-0:3.10.0-693.81.1.el7 | Fixed | RHSA-2020:5430 |
| Red Hat Enterprise Linux 7.6 Extended Update Support | kernel-0:3.10.0-957.65.1.el7 | Fixed | RHSA-2020:5656 |
| Red Hat Enterprise Linux 7.7 Extended Update Support | kernel-0:3.10.0-1062.40.1.el7 | Fixed | RHSA-2020:5206 |
| Red Hat Enterprise Linux 8 | kernel-0:4.18.0-240.el8 | Fixed | RHSA-2020:4431 |
| Red Hat Enterprise Linux 8 | kernel-rt-0:4.18.0-240.rt7.54.el8 | Fixed | RHSA-2020:4609 |
| Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUS | kernel-0:3.10.0-957.65.1.el7 | Fixed | RHSA-2020:5656 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | kernel | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Ext4 filesytems are built into the kernel so it is not possible to prevent the kernel module from loading. However, this flaw can be prevented by disallowing mounting of untrusted filesystems. As mounting is a privileged operation, (except for device hotplug) removing the ability for mounting and unmounting will prevent this flaw from being exploited.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AV:N/AC:M/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 3, 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 (17 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 3.52% (0.03523) | 88.86th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.54% (0.03539) | 87.74th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.79% (0.01794) | 81.54th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.40% (0.00395) | 74.27th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.28% (0.00278) | 67.37th | v3 (v2023.03.01) |
| Nov 13, 2023 | 0.28% (0.00278) | 64.77th | v3 (v2023.03.01) |
| Oct 4, 2023 | 0.24% (0.00243) | 61.87th | v3 (v2023.03.01) |
| Apr 11, 2023 | 0.27% (0.00273) | 63.13th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.26% (0.00256) | 61.64th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.11% (0.01108) | 53.57th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.11% (0.01108) | 51.54th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.15% (0.02150) | 56.98th | v2 (v2022.01.01) |
| Feb 3, 2022 | 6.21% (0.06208) | 81.93th | v1 |
| Jan 6, 2022 | 6.21% (0.06208) | 81.75th | v1 |
| Sep 1, 2021 | 1.45% (0.01454) | 71.88th | v1 |
| Apr 14, 2021 | 1.45% (0.01454) | 0.00th | v1 |
References (11)
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html vendor-advisoryx_refsource_SUSEThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-19447 Vendor Advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=205433
- https://bugzilla.redhat.com/show_bug.cgi?id=1781679 Issue Tracking
- https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19447 x_refsource_MISCExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html mailing-listx_refsource_MLISTThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html mailing-listx_refsource_MLISTThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html mailing-listx_refsource_MLISTThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-19447
- https://security.netapp.com/advisory/ntap-20200103-0001/ x_refsource_CONFIRMThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-19447
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html | vendor-advisoryx_refsource_SUSEThird Party Advisory | |
| https://access.redhat.com/security/cve/CVE-2019-19447 | Vendor Advisory | |
| https://bugzilla.kernel.org/show_bug.cgi?id=205433 | ||
| https://bugzilla.redhat.com/show_bug.cgi?id=1781679 | Issue Tracking | |
| https://github.com/bobfuzzer/CVE/tree/master/CVE-2019-19447 | x_refsource_MISCExploitThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html | mailing-listx_refsource_MLISTThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html | mailing-listx_refsource_MLISTThird Party Advisory | |
| https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html | mailing-listx_refsource_MLISTThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-19447 | ||
| https://security.netapp.com/advisory/ntap-20200103-0001/ | x_refsource_CONFIRMThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-19447 |
Change history (0)
No recorded changes yet.