Use of uninitialized resource in Linux kernel - CVE-2026-93121

Vulnerability identifier: #VU150890

CSH Severity: Low

CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-93121

CWE-ID: CWE-908

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause undefined behavior.

The vulnerability exists due to improper cleanup of an uninitialized dma_fence object in ffs_dmabuf_transfer() when handling an endpoint-disabled or request-allocation failure. A local user can initiate a DMA-buffer transfer that encounters either error condition to cause undefined behavior.

Linux kernel
Debian Linux
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-ibm (Ubuntu package)
linux-hwe-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux (Debian package)

Install security update from vendor's repository.

linux (Ubuntu package) - update to 7.0.0-42.42
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-ibm (Ubuntu package) - update to 7.0.0-1017.17
linux-hwe-7.0 (Ubuntu package) - update to 7.0.0-42.42~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1017.17
linux (Debian package) - update to 6.12.111-1

• https://git.kernel.org/stable/c/58952c83dfe6ea3294a74734d2d1018c1120779a
• https://git.kernel.org/stable/c/5fd8baacc7dc477df9cac61b45491840247a9b1e
• https://git.kernel.org/stable/c/621707dc67c9846fd876d7579ec951d92aa033f1
• https://git.kernel.org/stable/c/be539138d9a187af3b884525a395db10797c64f1

• Use of uninitialized resource in Linux kernel gadget function driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more