kernel: NULL pointer dereference in ext4/mballoc.c:ext4_process_freed_data() when mounting crafted ext4 image
Published Apr 2, 2018
5.5
MEDIUMCVSS 3.0
EPSS 1.85%
Description
The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) via a crafted ext4 image.
Affected products
- Vendor n/a Product Linux kernel through version 4.15 Defaultn/a
- Version Linux kernel through version 4.15StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Linux kernel through version 4.15 | n/a |
|
- ≤ 4.15.15
No data.
Red Hat Enterprise Linux 7
kernel-0:3.10.0-957.el7
Fixed · RHSA-2018:3083
Red Hat Enterprise Linux 7
kernel-alt-0:4.14.0-115.el7a
Fixed · RHSA-2018:2948
Red Hat Enterprise Linux 7
kernel-rt-0:3.10.0-957.rt56.910.el7
Fixed · RHSA-2018:3096
Red Hat Enterprise Linux 5
kernel
Will not fix
Red Hat Enterprise Linux 6
kernel
Fix deferred
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-0:3.10.0-957.el7 | Fixed | RHSA-2018:3083 |
| Red Hat Enterprise Linux 7 | kernel-alt-0:4.14.0-115.el7a | Fixed | RHSA-2018:2948 |
| Red Hat Enterprise Linux 7 | kernel-rt-0:3.10.0-957.rt56.910.el7 | Fixed | RHSA-2018:3096 |
| Red Hat Enterprise Linux 5 | kernel | Will not fix | n/a |
| Red Hat Enterprise Linux 6 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | Fix deferred | 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:N/UI:R/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:M/Au:N/C:N/I:N/A:C
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 (23 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.85% (0.01855) | 78.41th | v5 (v2026.06.15) |
| Sep 22, 2026 | 1.85% (0.01855) | 78.25th | v5 (v2026.06.15) |
| Sep 21, 2026 | 3.86% (0.03862) | 89.73th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.85% (0.01855) | 78.23th | v5 (v2026.06.15) |
| Sep 6, 2026 | 1.89% (0.01891) | 78.20th | v5 (v2026.06.15) |
| Sep 5, 2026 | 3.89% (0.03887) | 89.57th | v5 (v2026.06.15) |
| Aug 30, 2026 | 1.89% (0.01891) | 78.09th | v5 (v2026.06.15) |
| Aug 28, 2026 | 3.89% (0.03887) | 89.50th | v5 (v2026.06.15) |
| Aug 24, 2026 | 1.97% (0.01968) | 78.86th | v5 (v2026.06.15) |
| Aug 23, 2026 | 4.04% (0.04045) | 89.88th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.00% (0.01999) | 78.08th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.10% (0.00105) | 26.14th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.24% (0.00245) | 65.12th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.24% (0.00245) | 63.63th | v3 (v2023.03.01) |
| Mar 26, 2023 | 0.24% (0.00245) | 60.79th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.18% (0.00176) | 52.93th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.69% (0.02686) | 82.85th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.69% (0.02686) | 81.17th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.69% (0.02686) | 62.66th | v2 (v2022.01.01) |
| Feb 3, 2022 | 5.27% (0.05268) | 78.83th | v1 |
| Jan 6, 2022 | 5.27% (0.05268) | 78.62th | v1 |
| Sep 1, 2021 | 5.27% (0.05268) | 88.19th | v1 |
| Apr 14, 2021 | 5.27% (0.05268) | 0.00th | v1 |
References (23)
- http://openwall.com/lists/oss-security/2018/03/29/1 x_refsource_MISCMailing ListThird Party Advisory
- https://access.redhat.com/errata/RHSA-2018:2948 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2018:3083 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2018:3096 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2018-1092 Vendor Advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=199179 x_refsource_MISCIssue Tracking
- https://bugzilla.kernel.org/show_bug.cgi?id=199275 x_refsource_MISCIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1560777 x_refsource_MISCIssue TrackingThird Party Advisory
- https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44 x_refsource_MISCPatch
- https://lists.debian.org/debian-lts-announce/2018/05/msg00000.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2018-1092
- https://usn.ubuntu.com/3676-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3676-2/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3677-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3677-2/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3678-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3678-2/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3678-3/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3678-4/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3754-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2018-1092
- https://www.debian.org/security/2018/dsa-4187 vendor-advisoryx_refsource_DEBIAN
- https://www.debian.org/security/2018/dsa-4188 vendor-advisoryx_refsource_DEBIAN
Change history (0)
No recorded changes yet.