CVE-2018-1095

Public Exploit

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.15%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory redhat.com
Affected: n/a Linux kernel through version 4.15
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbdc00ce095a852f22df97baa401 patch
http://openwall.com/lists/oss-security/2018/03/29/1 mailing list
https://usn.ubuntu.com/3695-1/ vendor advisory
https://usn.ubuntu.com/3695-2/ vendor advisory
https://access.redhat.com/errata/RHSA-2018:2948 vendor advisory
https://bugzilla.kernel.org/show_bug.cgi?id=199185 issue tracking exploit
https://bugzilla.redhat.com/show_bug.cgi?id=1560793 issue tracking

Frequently Asked Questions

What is the severity of CVE-2018-1095?
CVE-2018-1095 has been scored as a medium severity vulnerability.
How to fix CVE-2018-1095?
To fix CVE-2018-1095, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-1095 being actively exploited in the wild?
It is possible that CVE-2018-1095 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-1095?
CVE-2018-1095 affects n/a Linux kernel through version 4.15.
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