CVE-2019-12456 Race condition in n/a

What is CVE-2019-12456?

CVE-2019-12456 is a high-severity vulnerability in Linux kernel, published on 30 May 2019. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in the MPT3COMMAND case in _ctl_ioctl_main in drivers/scsi/mpt3sas/mpt3sas_ctl.c in the Linux kernel through 5.1.5. It allows local users to cause a denial of service or possibly have unspecified other impact by changing the value of ioc_number between two kernel reads of that value, aka a "double fetch" vulnerability. NOTE: a third party reports that this is unexploitable because the doubly fetched value is not used

Which versions are affected by CVE-2019-12456?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2019-12456?

Apply the vendor's patch.

Is CVE-2019-12456 being exploited?

There is no known exploitation of CVE-2019-12456 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-2019-12456, GHSA-c9q3-58pp-r6v9, ROOT-OS-DEBIAN-11-CVE-2019-12456, ROOT-OS-DEBIAN-12-CVE-2019-12456, ROOT-OS-DEBIAN-13-CVE-2019-12456, UBUNTU-CVE-2019-12456.