PT-2018-1242 · Linux+3 · Linux Kernel+3
Wen Xu
·
Published
2018-03-26
·
Updated
2019-03-14
·
CVE-2018-1093
CVSS v2.0
7.8
High
| Vector | AV:N/AC:L/Au:N/C:N/I:N/A:C |
Name of the Vulnerable Software and Affected Versions
Linux kernel versions through 4.15.15
Description
The issue is related to the
ext4 valid block bitmap function in the Linux kernel, which allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image. This is because the balloc.c and ialloc.c files do not validate bitmap block numbers, leading to a buffer over-read in memory. The exploitation of this issue can allow a remote attacker to cause a denial of service using a specially crafted ext4 file system image.Recommendations
For Linux kernel versions through 4.15.15, update to a version later than 4.15.15 to resolve the issue. As a temporary workaround, consider restricting the use of ext4 file systems until a patch is available. Avoid using crafted ext4 images that could exploit this issue.
Fix
DoS
Out of bounds Read
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Linux Kernel
Suse
Ubuntu