Improper resource shutdown or release in Linux kernel - CVE-2026-72448

Vulnerability identifier: #VU142997

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-72448

CWE-ID: CWE-404

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 improper resource shutdown or release in the otx2_free_sq_res() send-queue resource teardown logic when tearing down a send queue with timestamping enabled. A local user can trigger interface shutdown or device removal to cause a denial of service.

Only send queues using timestamping are affected.

Linux kernel
Ubuntu
linux-nvidia (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-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/19d2d36e193c3fb515c052a56bfc83d8ac7b6764
• https://git.kernel.org/stable/c/3d45d40b872aec0073d4cf08956a6c9b87c5e396
• https://git.kernel.org/stable/c/452ec5058ea4ed63adae8d6beeac9ee687fe8061
• https://git.kernel.org/stable/c/a056db30de92945ff8ee6033096678bfbae878e3
• https://git.kernel.org/stable/c/c642a530aaaeb9a3e356cedfe77955e7f983380e
• https://git.kernel.org/stable/c/d6c0b0c802d3c49b86cad665a7f3790dc55a0394
• https://git.kernel.org/stable/c/e68ada66afcae0bc2a7c06b43c5a9a081d29e7b4
• https://git.kernel.org/stable/c/e8e9dff204e8d8553495893e1a44d2b5021648de

• Improper resource shutdown or release in Linux kernel octeontx2 nic driver
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-nvidia
• Ubuntu update for linux-azure-7.0
• Ubuntu update for linux
• Ubuntu update for linux-azure
• Ubuntu update for linux-oem-7.0