Use-after-free in Linux kernel - CVE-2026-72435

Vulnerability identifier: #VU143003

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-2026-72435

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.

The vulnerability exists due to a use-after-free in the ipset comment extension handling in netfilter when freeing comment extension pointers. A local user can trigger ipset comment initialization or cleanup operations to cause a denial of service.

Linux kernel
Ubuntu
linux-nvidia (Ubuntu package)
linux-nvidia-tegra (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
linux-azure (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux-nvidia (Ubuntu package) - addressed in versions 5.15.0-1112.113, 5.15.0.1112.112
linux-nvidia-tegra (Ubuntu package) - update to 6.8.0-1036.39+1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux (Ubuntu package) - addressed in versions 7.0.0-38.38, 7.0.0-38.38.1, 7.0.0-1008.9, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14, 7.0.0-1015.15
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1015.15
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1017.17

• https://git.kernel.org/stable/c/3ca9982a8882470aa0ac4e8bb9a552b181d1efcd
• https://git.kernel.org/stable/c/50b70f56f3baaff46599f59b2d93fa2540120776
• https://git.kernel.org/stable/c/6e98407cb94e035bba98956adc9096a76d8b2a9f
• https://git.kernel.org/stable/c/8087bb360a936a6314d22b567e4b861656943eb6
• https://git.kernel.org/stable/c/93a775fd67f3ef34949a9523bfa69403ee74efdd
• https://git.kernel.org/stable/c/c9787d7c24ffd83019f379455e1b97fb4f0f75eb
• https://git.kernel.org/stable/c/d01b4b471f0fc5c396af62845e972ccf99cee29a
• https://git.kernel.org/stable/c/fcb565966534909377a16be5f7b065db2e25c8b5

• Use-after-free in Linux kernel netfilter ipset
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux-nvidia-tegra
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0