Resource exhaustion in Linux kernel - CVE-2026-98536

Vulnerability identifier: #VU156838

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-2026-98536

CWE-ID: CWE-400

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service through prolonged task stalls and a possible kernel panic.

The vulnerability exists due to failure to report Tasks-RCU quiescent states in cleanup_offline_cgwbs_workfn() when draining offline cgroup writeback domains on kernels where cond_resched() is disabled by the preemption configuration. A local user can cause prolonged draining of a writeback domain with many attached inodes to delay concurrent BPF or ftrace detach operations, blocking tasks and potentially triggering a kernel panic.

Linux kernel
Ubuntu
linux-nvidia-tegra (Ubuntu package)
linux-nvidia-tegra-igx (Ubuntu package)
linux-nvidia-tegra-5.15 (Ubuntu package)
linux (Ubuntu package)
linux-gcp (Ubuntu package)
linux-oracle (Ubuntu package)
linux-aws (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-nvidia-tegra (Ubuntu package) - update to 5.15.0-1070.72
linux-nvidia-tegra-igx (Ubuntu package) - update to 5.15.0-1059.59
linux-nvidia-tegra-5.15 (Ubuntu package) - update to 5.15.0-1070.72~20.04.1
linux (Ubuntu package) - update to 7.0.0-42.42
linux-gcp (Ubuntu package) - update to 7.0.0-1016.18
linux-oracle (Ubuntu package) - update to 7.0.0-1015.16
linux-aws (Ubuntu package) - update to 7.0.0-1016.17
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/260f586a80e7f624dd7f069898a75a904f34d373
• https://git.kernel.org/stable/c/407a5d205179a4ab186571b0e16ec42725dc77bc
• https://git.kernel.org/stable/c/42462b5bb0dec57db7f85d0f77655c737d45754d
• https://git.kernel.org/stable/c/4eb889649eaf65f4a5727b04ba1c017b7d05bb16
• https://git.kernel.org/stable/c/863049b4018237d1590cd13b16e9fe9c0faad2c6
• https://git.kernel.org/stable/c/ebf1555ad2821be06f87a88ffd9a2cab8d2200e1
• https://git.kernel.org/stable/c/fd3bf32279df98751364b3609eb100a3e42f253b

• Resource exhaustion in Linux kernel mm
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux, linux-aws, linux-gcp and more
• Ubuntu update for linux-nvidia-tegra, linux-nvidia-tegra-5.15, linux-nvidia-tegra-igx
• Ubuntu update for linux, linux-aws, linux-aws-5.15 and more