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Vulnerability record · CVE-2026-64222 · published 24 July 2026

CVE-2026-64222: Linux kernel double free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: octeontx2-pf: avoid double free of pool->stack on AQ init failure otx2_pool_aq_init() frees pool->stack when mailbox sync or retry allocation fails, but leaves the pointer unchanged. Later, otx2_sq_aura_pool_init() unwinds the partial setup through otx2_aura_pool_free(), which frees pool->stack again. The CN20K-specific cn20k_pool_aq_init() implementation has the same bug in its corresponding error path. Set pool->stack to NULL immediately after the local free so the shared cleanup path does not free the same stack again while cleaning up partially initialized pool state. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc3. Runtime validation was not performed because reproducing this path requires OcteonTX2/CN20K hardware.

7.0 CVSS 3.1 High EPSS 0.12% · top 98.3% CWE-415 · Double free
7.0CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
11 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: octeontx2-pf: avoid double free of pool->stack on AQ init failure otx2_pool_aq_init() frees pool->stack when mailbox sync or retry allocation fails, but leaves the pointer unchanged. Later, otx2_sq_aura_pool_init() unwinds the partial setup through otx2_aura_pool_free(), which frees pool->stack again. The CN20K-specific cn20k_pool_aq_init() implementation has the same bug in its corresponding error path. Set pool->stack to NULL immediately after the local free so the shared cleanup path does not free the same stack again while cleaning up partially initialized pool state. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1-rc3. Runtime validation was not performed because reproducing this path requires OcteonTX2/CN20K hardware.

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64222), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.