CVE-2018-1093

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.

Category

5.5
CVSS
Severity: Medium
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.19%
Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory debian.org Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com Vendor Advisory ubuntu.com
Affected: n/a Linux kernel through version 4.15
Published at:
Updated at:

References

Link Tags
https://usn.ubuntu.com/3752-2/ vendor advisory
https://usn.ubuntu.com/3676-1/ vendor advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00015.html mailing list
http://openwall.com/lists/oss-security/2018/03/29/1 mailing list
https://usn.ubuntu.com/3752-3/ vendor advisory
https://lists.debian.org/debian-lts-announce/2018/07/msg00016.html mailing list
https://lists.debian.org/debian-lts-announce/2018/06/msg00000.html mailing list
https://bugzilla.kernel.org/show_bug.cgi?id=199181 issue tracking
https://www.debian.org/security/2018/dsa-4188 vendor advisory
https://usn.ubuntu.com/3754-1/ vendor advisory
https://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/?id=7dac4a1726a9c64a517d595c40e95e2d0d135f6f patch
https://bugzilla.redhat.com/show_bug.cgi?id=1560782 issue tracking third party advisory
https://usn.ubuntu.com/3676-2/ vendor advisory
https://usn.ubuntu.com/3752-1/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-1093?
CVE-2018-1093 has been scored as a medium severity vulnerability.
How to fix CVE-2018-1093?
To fix CVE-2018-1093, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-1093 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-1093 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-1093?
CVE-2018-1093 affects n/a Linux kernel through version 4.15.
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