CVE-2018-1095
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…
Does this matter?
Lower severity and a low EPSS score (1.43%). Track it; it rarely justifies an emergency change on its own.
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 3.0
- 5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- EPSS
- 1.43% probability · 73th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- secalert@redhat.com
EPSS moved from 2.5% on 21 September 2026 to 1.4% on 27 October 2026.
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=199185Exploit, Issue 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=ce3fd194fcc6fbdc00ce095a852f22df97baa401Patch
- 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=199185Exploit, Issue 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=ce3fd194fcc6fbdc00ce095a852f22df97baa401Patch
- https://usn.ubuntu.com/3695-1/
- https://usn.ubuntu.com/3695-2/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.