Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 4.15.15 |
Related Weaknesses (CWE)
References
- http://openwall.com/lists/oss-security/2018/03/29/1Mailing List
- https://access.redhat.com/errata/RHSA-2018:2948
- https://bugzilla.kernel.org/show_bug.cgi?id=199185ExploitIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1560793Issue Tracking
- https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd1Patch
- https://usn.ubuntu.com/3695-1/
- https://usn.ubuntu.com/3695-2/
- http://openwall.com/lists/oss-security/2018/03/29/1Mailing List
- https://access.redhat.com/errata/RHSA-2018:2948
- https://bugzilla.kernel.org/show_bug.cgi?id=199185ExploitIssue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=1560793Issue Tracking
- https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd1Patch
- https://usn.ubuntu.com/3695-1/
- https://usn.ubuntu.com/3695-2/
FAQ
What is CVE-2018-1095?
CVE-2018-1095 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 cons...
How severe is CVE-2018-1095?
CVE-2018-1095 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-1095?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.