Type Confusion in Linux kernel - CVE-2026-46081

Vulnerability identifier: #VU132409

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-46081

CWE-ID: CWE-843

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to memory corruption in acomp_reqchain_done() when processing asynchronous compression request completion for requests using the DMA virtual address interface. A local user can trigger an asynchronous compression request through a hardware implementation such as the QAT driver to cause a denial of service.

The issue is triggered when the request follows the acomp_do_req_chain() path and the asynchronous completion callback receives a pointer to the chain member instead of the request structure.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-realtime (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (Ubuntu package)
linux-raspi (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-ibm (Ubuntu package)
linux-azure-fde (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-realtime (Ubuntu package) - update to 7.0.0-27.27.1
linux-gcp (Ubuntu package) - update to 7.0.0-1007.7
linux-oracle (Ubuntu package) - update to 7.0.0-1007.7
linux-aws (Ubuntu package) - update to 7.0.0-1008.8
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14
linux-azure (Ubuntu package) - update to 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-ibm (Ubuntu package) - update to 7.0.0-1009.9
linux-azure-fde (Ubuntu package) - update to 7.0.0-1009.9

• https://git.kernel.org/stable/c/1a2785e5985627f2265ba7775949601a29ba0d1e
• https://git.kernel.org/stable/c/343a5bf68a8ff9affcf2b70677ea4cf40c195ee4
• https://git.kernel.org/stable/c/d7e20b9bd6c990773cf0c09e2642250b8a70263d

• Type Confusion in Linux kernel crypto
• Ubuntu update for linux
• Ubuntu update for linux-raspi
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure