Description
The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel through 4.15.15 allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image because balloc.c and ialloc.c do not validate bitmap block numbers.
References (14)
Core 14
Core References
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3752-2/
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3676-1/
Mailing List mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html
Mailing List x_refsource_misc
http://openwall.com/lists/oss-security/2018/03/29/1
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3752-3/
Mailing List mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html
Mailing List mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html
Issue Tracking x_refsource_misc
https://bugzilla.kernel.org/show_bug.cgi?id=199181
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2018/dsa-4188
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3754-1/
Patch x_refsource_misc
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=7dac4a1726a9c64a517d595c40e95e2d0d135f6f
Issue Tracking, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1560782
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3676-2/
Vendor Advisory vendor-advisory
x_refsource_ubuntu
https://usn.ubuntu.com/3752-1/
Scores
CVSS v3
5.5
EPSS
0.0010
EPSS Percentile
27.2%
Attack Vector
LOCAL
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Details
CWE
CWE-125
Status
published
Products (1)
linux/linux_kernel
< 4.15.15
Published
Apr 02, 2018
Tracked Since
Feb 18, 2026