Use-after-free in Linux kernel - CVE-2026-98512

Vulnerability identifier: #VU156813

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-2026-98512

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to potentially cause a denial of service by triggering a read of freed kernel memory.

The vulnerability exists due to use-after-free in the Linux kernel nouveau scheduler when retrieving timeline information for a finished fence after its scheduler has been destroyed. A local user can query an exported fence through SYNC_IOC_FILE_INFO to trigger drm_sched_fence_get_timeline_name() to dereference freed scheduler memory, potentially causing a 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/35151e9a8274174ccbb92e3b3ba7dc7a008dcada
• https://git.kernel.org/stable/c/40edf5eefc3fd94592a91d6eb074d4fc6f606c75
• https://git.kernel.org/stable/c/cd6e11b6ebe04a0a1f1435df561acada9eadc563
• https://git.kernel.org/stable/c/f7eae6d8d768fabd6b59779ca7da79e02c74e113

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