CVE-2026-64222

octeontx2-pf: avoid double free of pool->stack on AQ init failure

State: Published
Severity: 7.0 High
Published: Jul 24, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.0 High	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-415 Double Free

Affected Products

Product	Versions
LinuxLinux	caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before e6e9bc0bf963662b7042048ab0281014625d4cb4Affected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before b92e7ea408b6f1144648909c9c49a55d245d7300Affected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 94192b0579333c3deee2441379aab8ca98fc2e6bAffected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 4c29603498b05c049dbbbc47e882f2fbf0193cd7Affected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 0488a0bb344fb1992853b60082acff6be8164d74Affected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 0d9b9d7dbef976ae7f855b6358f1d703014e96eaAffected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before c4b8c5d51632538b19ee01cf6d70cbceeefbd3ecAffected caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 9b244c242bec48b37e82b89787afd6a4c43457e1Affected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.93 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.11 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before e6e9bc0bf963662b7042048ab0281014625d4cb4Affected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before b92e7ea408b6f1144648909c9c49a55d245d7300Affected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 94192b0579333c3deee2441379aab8ca98fc2e6bAffected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 4c29603498b05c049dbbbc47e882f2fbf0193cd7Affected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 0488a0bb344fb1992853b60082acff6be8164d74Affected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 0d9b9d7dbef976ae7f855b6358f1d703014e96eaAffected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before c4b8c5d51632538b19ee01cf6d70cbceeefbd3ecAffected
caa2da34fd25a37e9fd43343b6966fb9d730a6d5 to before 9b244c242bec48b37e82b89787afd6a4c43457e1Affected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.93 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.11 through 7.0.*Not affected
7.1 and laterNot affected

References

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