Double free in Linux kernel - CVE-2026-64222

Vulnerability identifier: #VU139779

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-2026-64222

CWE-ID: CWE-415

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 double free in otx2_pool_aq_init() and cn20k_pool_aq_init() when handling allocation or mailbox synchronization failures during pool initialization. A local user can trigger the affected error path to cause a denial of service.

Exploitation requires OcteonTX2 or CN20K hardware.

Linux kernel
openEuler
Ubuntu
kernel-debugsource
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-headers
kernel-extra-modules
kernel-devel
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel
perf-debuginfo
python3-perf
python3-perf-debuginfo
linux-aws (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-nvidia-bos (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel-debugsource - update to 6.6.0-145.3.29.160
perf - update to 6.6.0-145.3.29.160
kernel-tools-devel - update to 6.6.0-145.3.29.160
kernel-tools-debuginfo - update to 6.6.0-145.3.29.160
kernel-tools - update to 6.6.0-145.3.29.160
kernel-source - update to 6.6.0-145.3.29.160
kernel-headers - update to 6.6.0-145.3.29.160
kernel-extra-modules - update to 6.6.0-145.3.29.160
kernel-devel - update to 6.6.0-145.3.29.160
kernel-debuginfo - update to 6.6.0-145.3.29.160
bpftool-debuginfo - update to 6.6.0-145.3.29.160
bpftool - update to 6.6.0-145.3.29.160
kernel - update to 6.6.0-145.3.29.160
perf-debuginfo - update to 6.6.0-145.3.29.160
python3-perf - update to 6.6.0-145.3.29.160
python3-perf-debuginfo - update to 6.6.0-145.3.29.160
linux-aws (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1015.15
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-nvidia (Ubuntu package) - addressed in versions 7.0.0-1016.16, 7.0.0-1016.16~24.04.1
linux-nvidia-bos (Ubuntu package) - update to 7.0.0-2016.16

• https://git.kernel.org/stable/c/0488a0bb344fb1992853b60082acff6be8164d74
• https://git.kernel.org/stable/c/0d9b9d7dbef976ae7f855b6358f1d703014e96ea
• https://git.kernel.org/stable/c/4c29603498b05c049dbbbc47e882f2fbf0193cd7
• https://git.kernel.org/stable/c/94192b0579333c3deee2441379aab8ca98fc2e6b
• https://git.kernel.org/stable/c/9b244c242bec48b37e82b89787afd6a4c43457e1
• https://git.kernel.org/stable/c/b92e7ea408b6f1144648909c9c49a55d245d7300
• https://git.kernel.org/stable/c/c4b8c5d51632538b19ee01cf6d70cbceeefbd3ec
• https://git.kernel.org/stable/c/e6e9bc0bf963662b7042048ab0281014625d4cb4

• Double free in Linux kernel octeontx2 nic driver
• Ubuntu update for linux-aws
• Ubuntu update for linux-nvidia-bos
• Ubuntu update for linux-nvidia
• openEuler 24.03 LTS SP3 update for kernel
• Ubuntu update for linux-gcp-7.0