Vulnerability Details : CVE-2018-1093
The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel through 4.15.15 allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image because balloc.c and ialloc.c do not validate bitmap block numbers.
Vulnerability category: Denial of service
Products affected by CVE-2018-1093
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-1093
0.23%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 60 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-1093
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.1
|
HIGH | AV:N/AC:M/Au:N/C:N/I:N/A:C |
8.6
|
6.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2018-1093
-
The product reads data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-1093
-
https://usn.ubuntu.com/3754-1/
USN-3754-1: Linux kernel vulnerabilities | Ubuntu security notices
-
https://usn.ubuntu.com/3752-2/
USN-3752-2: Linux kernel (HWE) vulnerabilities | Ubuntu security notices
-
https://usn.ubuntu.com/3676-2/
USN-3676-2: Linux kernel (Xenial HWE) vulnerabilities | Ubuntu security notices
-
https://usn.ubuntu.com/3752-1/
USN-3752-1: Linux kernel vulnerabilities | Ubuntu security notices
-
https://www.debian.org/security/2018/dsa-4188
Debian -- Security Information -- DSA-4188-1 linux
-
https://bugzilla.kernel.org/show_bug.cgi?id=199181
199181 – Out-of-bound access in ext4_valid_block_bitmap when mounting and operating on a crafted ext4 imageIssue Tracking
-
https://usn.ubuntu.com/3752-3/
USN-3752-3: Linux kernel (Azure, GCP, OEM) vulnerabilities | Ubuntu security notices
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https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=7dac4a1726a9c64a517d595c40e95e2d0d135f6f
kernel/git/tytso/ext4.git - Ext4 filesystem treePatch
-
https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html
[SECURITY] [DLA 1422-1] linux security update
-
https://bugzilla.redhat.com/show_bug.cgi?id=1560782
1560782 – (CVE-2018-1093) CVE-2018-1093 kernel: Out of bounds read in ext4/balloc.c:ext4_valid_block_bitmap() causes crash with crafted ext4 imageIssue Tracking;Third Party Advisory
-
https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html
[SECURITY] [DLA 1392-1] linux security update
-
https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html
[SECURITY] [DLA 1422-2] linux security update
-
https://usn.ubuntu.com/3676-1/
USN-3676-1: Linux kernel vulnerabilities | Ubuntu security notices
-
http://openwall.com/lists/oss-security/2018/03/29/1
oss-security - a number of CVEs for issues in the filesystem's code in the Linux kernelMailing List
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