Use-after-free in Linux kernel - CVE-2026-98625

Vulnerability identifier: #VU156935

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-98625

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service through a use-after-free in the Linux kernel.

The vulnerability exists due to a use-after-free in the netfilter flowtable hardware offload worker when flow destruction overlaps with garbage collection. A local user can potentially trigger a race in which NF_FLOW_HW_DEAD is set before NF_FLOW_HW_PENDING is cleared, allowing garbage collection and an RCU callback to free the flow before the worker resumes accessing it, to cause a denial of service.

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/00e452a7ca9fda135ea3d04a11128d5088e354a8
• https://git.kernel.org/stable/c/56f39c7d139bb76072efe2fb3dcafc13ba915ad8
• https://git.kernel.org/stable/c/b0ef9450e93f2adeb77593db14c2ac7c6c8f5060
• https://git.kernel.org/stable/c/b4f0f05dfbe836a171bff261f17d098a4d5461ea
• https://git.kernel.org/stable/c/d644b23afe1ef509c9961a6d84a093c2587edf02
• https://git.kernel.org/stable/c/e20701843032c438f879066a77ea85e361c6b999
• https://git.kernel.org/stable/c/f26652e99f519e6bd34f8a9b48fbb33c603585f2
• https://git.kernel.org/stable/c/f92e8f39726ba68a7c42c6b7566be687c8161579

• Use-after-free in Linux kernel netfilter
• 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