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NVD / CVE Program· CNA Linux

CVE-2026-64222: octeontx2-pf: avoid double free of pool->stack on AQ init failure

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: Linux Linux 0488a0bb344fb1992853b60082acff6be8164d74, 0d9b9d7dbef976ae7f855b6358f1d703014e96ea, 4c29603498b05c049dbbbc47e882f2fbf0193cd7.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0488a0bb344fb1992853b60082acff6be8164d74, 0d9b9d7dbef976ae7f855b6358f1d703014e96ea, 4c29603498b05c049dbbbc47e882f2fbf0193cd7 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.0 · v3.1—No exploit Fix available
Published
Jul 24, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.0
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-64222

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel5.6 and later · before 5.10.259
  • linux linux kernel5.11 and later · before 5.15.210
  • linux linux kernel5.16 and later · before 6.1.176
  • linux linux kernel6.2 and later · before 6.6.143
  • linux linux kernel6.7 and later · before 6.12.93
  • linux linux kernel6.13 and later · before 6.18.35
  • linux linux kernel6.19 and later · before 7.0.11
  • linux linux kernel7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 5.6affected
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before e6e9bc0bf963662b7042048ab0281014625d4cb4affected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before b92e7ea408b6f1144648909c9c49a55d245d7300affected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before 94192b0579333c3deee2441379aab8ca98fc2e6baffected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before 4c29603498b05c049dbbbc47e882f2fbf0193cd7affected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before 0488a0bb344fb1992853b60082acff6be8164d74affected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before 0d9b9d7dbef976ae7f855b6358f1d703014e96eaaffected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before c4b8c5d51632538b19ee01cf6d70cbceeefbd3ecaffected · git
    • caa2da34fd25a37e9fd43343b6966fb9d730a6d5 and later · before 9b244c242bec48b37e82b89787afd6a4c43457e1affected · git
    • before 5.6not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.176-16.1.176-1
Debian:13linuxbefore 6.12.94-16.12.94-1
Debian:14linuxbefore 7.0.12-17.0.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64219Jul 24, 2026 · drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
    28Monitor
  • ← EarlierCVE-2026-64220Jul 24, 2026 · device property: set fwnode->secondary to NULL in fwnode_init()
    22Monitor
  • Later →CVE-2026-64223Jul 24, 2026 · wifi: mac80211: consume only present negotiated TTLM maps
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0488a0bb344fb1992853b60082acff6be8164d74Vendor (CNA)
Linux Linux0d9b9d7dbef976ae7f855b6358f1d703014e96eaVendor (CNA)
Linux Linux4c29603498b05c049dbbbc47e882f2fbf0193cd7Vendor (CNA)
Linux Linux94192b0579333c3deee2441379aab8ca98fc2e6bVendor (CNA)
Linux Linux9b244c242bec48b37e82b89787afd6a4c43457e1Vendor (CNA)
Linux Linuxb92e7ea408b6f1144648909c9c49a55d245d7300Vendor (CNA)
Linux Linuxc4b8c5d51632538b19ee01cf6d70cbceeefbd3ecVendor (CNA)
Linux Linuxe6e9bc0bf963662b7042048ab0281014625d4cb4Vendor (CNA)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-643831 days apartsmb: client: fix double-free in SMB2_flush() replay
    39Monitor
  • CVE-2026-643841 days apartsmb: client: fix change notify replay double-free
    39Monitor
  • CVE-2026-643851 days apartsmb: client: fix double-free in SMB2_ioctl() replay
    39Monitor
  • CVE-2026-643861 days apartsmb: client: fix query_info() replay double-free
    39Monitor
  • CVE-2026-643871 days apartsmb: client: fix query directory replay double-free
    39Monitor
  • CVE-2026-638885 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records