Use-after-free in Linux kernel - CVE-2026-90433

Vulnerability identifier: #VU151045

CSH Severity: Low

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

CVE-ID: CVE-2026-90433

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a use-after-free condition.

The vulnerability exists due to improper resource lifetime management in the tiny_spi_irq() interrupt handler when handling a late or latched interrupt during device removal. A local user can cause the interrupt handler to access freed controller memory to cause a use-after-free condition.

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/0260c94453a08491640e61f8cf0c384edbe7bd11
• https://git.kernel.org/stable/c/1cd16c8d68f58e54abb8f331d05469237200631f
• https://git.kernel.org/stable/c/d710f43ce30975d197f73c543bfe47b958d8ba17
• https://git.kernel.org/stable/c/ef5cc4a8c088d05549f71950a72b5deff5000fd7

• Use-after-free in Linux kernel spi driver
• Debian update for linux
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more