CVE-2026-43055 scsi: target: file: Use kzalloc_flex for aio_cmd

What is CVE-2026-43055?

CVE-2026-43055 is a high-severity vulnerability in Linux kernel, published on 1 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

scsi: target: file: Use kzalloc_flex for aio_cmd

The target_core_file doesn't initialize the aio_cmd->iocb for the ki_write_stream. When a write command fd_execute_rw_aio() is executed, we may get a bogus ki_write_stream value, causing unintended write failure status when checking iocb->ki_write_stream > max_write_streams in the block device.

Let's just use kzalloc_flex when allocating the aio_cmd and let ki_write_stream=0 to fix this issue.

Weakness: CWE-457

Which versions are affected by CVE-2026-43055?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-43055?

Apply the vendor's patch.

Is CVE-2026-43055 being exploited?

There is no known exploitation of CVE-2026-43055 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 BELL-CVE-2026-43055, DEBIAN-CVE-2026-43055, GHSA-9xgj-pwp4-prr4, UBUNTU-CVE-2026-43055.