kernel: out-of-bound access in fs/posix_acl.c:get_acl() causes crash with crafted ext4 image
Published Apr 2, 2018
5.5
MEDIUMCVSS 3.0
EPSS 1.43%
Description
The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) 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-alt-0:4.14.0-115.el7a
Fixed · RHSA-2018:2948
Red Hat Enterprise Linux 5
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise MRG 2
realtime-kernel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | kernel-alt-0:4.14.0-115.el7a | Fixed | RHSA-2018:2948 |
| Red Hat Enterprise Linux 5 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise MRG 2 | realtime-kernel | 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: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:L/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 v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (19 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.43% (0.01429) | 72.03th | v5 (v2026.06.15) |
| Sep 22, 2026 | 1.43% (0.01429) | 71.83th | v5 (v2026.06.15) |
| Sep 21, 2026 | 2.52% (0.02524) | 84.08th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.43% (0.01429) | 71.81th | v5 (v2026.06.15) |
| Sep 6, 2026 | 1.46% (0.01456) | 71.74th | v5 (v2026.06.15) |
| Sep 5, 2026 | 2.54% (0.02541) | 83.84th | v5 (v2026.06.15) |
| Aug 30, 2026 | 1.46% (0.01456) | 71.61th | v5 (v2026.06.15) |
| Aug 28, 2026 | 2.54% (0.02541) | 83.74th | v5 (v2026.06.15) |
| Aug 24, 2026 | 1.46% (0.01456) | 71.46th | v5 (v2026.06.15) |
| Aug 23, 2026 | 2.54% (0.02541) | 83.68th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.46% (0.01456) | 69.98th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.15% (0.00153) | 33.41th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.14% (0.00140) | 51.24th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.14% (0.00140) | 49.02th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00118) | 44.03th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.11% (0.01108) | 55.18th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.11% (0.01108) | 29.61th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.06% (0.02061) | 50.21th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.06% (0.02061) | 0.00th | v1 |
References (10)
- http://openwall.com/lists/oss-security/2018/03/29/1 x_refsource_MISCMailing List
- https://access.redhat.com/errata/RHSA-2018:2948 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2018-1095 Vendor Advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=199185 x_refsource_MISCExploitIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1560793 x_refsource_MISCIssue Tracking
- https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401 x_refsource_MISCPatch
- https://nvd.nist.gov/vuln/detail/CVE-2018-1095
- https://usn.ubuntu.com/3695-1/ vendor-advisoryx_refsource_UBUNTU
- https://usn.ubuntu.com/3695-2/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2018-1095
| Link | Providers | Tags |
|---|---|---|
| http://openwall.com/lists/oss-security/2018/03/29/1 | x_refsource_MISCMailing List | |
| https://access.redhat.com/errata/RHSA-2018:2948 | vendor-advisoryx_refsource_REDHAT | |
| https://access.redhat.com/security/cve/CVE-2018-1095 | Vendor Advisory | |
| https://bugzilla.kernel.org/show_bug.cgi?id=199185 | x_refsource_MISCExploitIssue Tracking | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1560793 | x_refsource_MISCIssue Tracking | |
| https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401 | x_refsource_MISCPatch | |
| https://nvd.nist.gov/vuln/detail/CVE-2018-1095 | ||
| https://usn.ubuntu.com/3695-1/ | vendor-advisoryx_refsource_UBUNTU | |
| https://usn.ubuntu.com/3695-2/ | vendor-advisoryx_refsource_UBUNTU | |
| https://www.cve.org/CVERecord?id=CVE-2018-1095 |
Change history (0)
No recorded changes yet.