Vulnerability Details : CVE-2018-13093
An issue was discovered in fs/xfs/xfs_icache.c in the Linux kernel through 4.17.3. There is a NULL pointer dereference and panic in lookup_slow() on a NULL inode->i_ops pointer when doing pathwalks on a corrupted xfs image. This occurs because of a lack of proper validation that cached inodes are free during allocation.
Vulnerability category: Memory Corruption
Products affected by CVE-2018-13093
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-13093
0.19%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 55 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-13093
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:N/A:P |
8.6
|
2.9
|
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-2018-13093
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-13093
-
https://usn.ubuntu.com/4094-1/
USN-4094-1: Linux kernel vulnerabilities | Ubuntu security notices
-
https://usn.ubuntu.com/4118-1/
USN-4118-1: Linux kernel (AWS) vulnerabilities | Ubuntu security notices
-
https://lists.debian.org/debian-lts-announce/2020/03/msg00001.html
[SECURITY] [DLA 2114-1] linux-4.9 security update
-
https://github.com/torvalds/linux/commit/afca6c5b2595fc44383919fba740c194b0b76aff
xfs: validate cached inodes are free when allocated · torvalds/linux@afca6c5 · GitHubPatch
-
https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git/commit/?h=for-next&id=afca6c5b2595fc44383919fba740c194b0b76aff
xfs/xfs-linux.git - XFS kernel development treePatch;Third Party Advisory
-
https://bugzilla.kernel.org/show_bug.cgi?id=199367
199367 – Uninitialized function pointer (lookup) triggered when mounting and operating a crafted xfs imageIssue Tracking;Third Party Advisory
-
https://access.redhat.com/errata/RHSA-2019:2029
RHSA-2019:2029 - Security Advisory - Red Hat Customer Portal
-
https://access.redhat.com/errata/RHSA-2019:2043
RHSA-2019:2043 - Security Advisory - Red Hat Customer Portal
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