CVE-2026-23059 scsi: qla2xxx: Sanitize payload size to prevent member overflow
A buffer overflow in the qla2xxx SCSI driver allows attackers with local access or adjacent network position to cause memory corruption, potentially leading to code execution or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23059?
CVE-2026-23059 is a memory corruption vulnerability in Linux, published on 4 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: qla2xxx: Sanitize payload size to prevent member overflow
In qla27xx_copy_fpin_pkt() and qla27xx_copy_multiple_pkt(), the frame_size reported by firmware is used to calculate the copy length into item->iocb. However, the iocb member is defined as a fixed-size 64-byte array within struct purex_item.
If the reported frame_size exceeds 64 bytes, subsequent memcpy calls will overflow the iocb member boundary. While extra memory might be allocated, this cross-member write is unsafe and triggers warnings under CONFIG_FORTIFY_SOURCE.
Fix this by capping total_bytes to the size of the iocb member (64 bytes) before allocation and copying. This ensures all copies remain within the bounds of the destination structure member.
Which versions are affected by CVE-2026-23059?
How do I fix CVE-2026-23059?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-23059 being exploited?
There is no known exploitation of CVE-2026-23059 in the wild and no public exploit code.
Sources
Also known as AZL-77244, BELL-CVE-2026-23059, DEBIAN-CVE-2026-23059, GHSA-6mm8-fcwp-3g49, ROOT-OS-DEBIAN-13-CVE-2026-23059, ROOT-OS-UBUNTU-2404-CVE-2026-23059 and 1 more.