CVE-2019-18806 Denial of service in n/a

What is CVE-2019-18806?

CVE-2019-18806 is a medium-severity denial of service vulnerability in Linux kernel, published on 7 Nov 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A memory leak in the ql_alloc_large_buffers() function in drivers/net/ethernet/qlogic/qla3xxx.c in the Linux kernel before 5.3.5 allows local users to cause a denial of service (memory consumption) by triggering pci_dma_mapping_error() failures, aka CID-1acb8f2a7a9f.

Weakness: CWE-401

Which versions are affected by CVE-2019-18806?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2019-18806?

Upgrade to a fixed version.

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-2019-18806 being exploited?

There is no known exploitation of CVE-2019-18806 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-2019-18806, GHSA-9m44-5m43-4rmj, UBUNTU-CVE-2019-18806.