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 service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image.

Affected

Linux kernel through version 4.15

CVSS v3.0 NVD

5.5 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v2.0 NVD

7.1 HIGHAV:N/AC:M/Au:N/C:N/I:N/A:C

EPSS

1.43% chance of exploitation in the next 30 days, 73rd percentile

Published

2018-04-02

Updated

2024-08-05

Proof-of-concept exploits (1)

• https://bugzilla.kernel.org/show_bug.cgi?id=199185

Security advisories

• https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=ce3fd194fcc6fbd…
• https://bugzilla.redhat.com/show_bug.cgi?id=1560793
• https://usn.ubuntu.com/3695-1
• https://usn.ubuntu.com/3695-2

References

• CVE Record
• NVD entry