NULL pointer dereference in Linux kernel - CVE-2026-98522

Vulnerability identifier: #VU156824

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-2026-98522

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service by triggering a kernel NULL pointer dereference.

The vulnerability exists due to incorrect propagation of mapping errors in the Linux kernel Imagination GPU driver's pvr_mmu_map_sgl() function when handling GPU memory mapping failures. A local user can trigger a mapping operation that fails to cause pvr_mmu_map() to continue processing instead of returning an error, leading to a NULL pointer dereference and kernel crash.

Linux kernel
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)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
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

• https://git.kernel.org/stable/c/13c7ae1d92ceea18d55612fa9431ca5ac77025f5
• https://git.kernel.org/stable/c/7b824c293a6b56de8285a97984c507cba56bc4c4
• https://git.kernel.org/stable/c/afe5b4d66d45b278ecd0e3d6889fb208ce2e5339
• https://git.kernel.org/stable/c/d30ea2747164992f5e720f6f53695d422bdc0346

• NULL pointer dereference in Linux kernel drm imagination driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more