CVE-2018-1093 Denial of service in Linux kernel through version 4.15

What is CVE-2018-1093?

CVE-2018-1093 is a medium-severity denial of service vulnerability in Linux kernel, published on 2 Apr 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-125

Which versions are affected by CVE-2018-1093?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2018-1093?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2018-1093 being exploited?

There is no known exploitation of CVE-2018-1093 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-1093, GHSA-pv9g-26f5-fxv7, UBUNTU-CVE-2018-1093.