CVE-2026-64518

Out-of-bounds access via TIME_WAIT lock annotation

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds access in Linux Kernel 6.12.5 through 6.12.91 and 6.13 allows attackers to cause unspecified impact via TCP-AO traffic. tcp_ao_established_key() passes a smaller tcp_timewait_sock to lockdep_sock_is_held(), which accesses the absent sk_lock field beyond that object. Reachability requires IPv4 or IPv6 TCP-AO TIME_WAIT acknowledgment processing, and Linux has not published a concrete security consequence beyond the invalid access.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Out-of-bounds access in Linux Kernel 6.12.5 through 6.12.91 and 6.13 allows attackers to cause unspecified impact via TCP-AO traffic. tcp_ao_established_key() passes a smaller tcp_timewait_sock to lockdep_sock_is_held(), which accesses the absent sk_lock field beyond that object. Reachability requires IPv4 or IPv6 TCP-AO TIME_WAIT acknowledgment processing, and Linux has not published a concrete security consequence beyond the invalid access.

The record

CVE
CVE-2026-64518
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=051f49d5176613dea88ecf73a101c3a99f4720e9 <87bb3e719042f0030a6dad39118c6a6b2a491ad9
  2. Affected versionversion=6.12.5 <6.12.92
  3. Affected versionversion=6.13
  4. Affected versionversion=6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 <03cb001ef87b3f8d859cf7f96329acf3d6235d29
  5. Affected versionversion=6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 <29cf64d128c94cf98d1c69d8b2962d39db5ff4c6
  6. Affected versionversion=6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 <510db031ba6eb40134f84c90ef963ea4b6dfb878

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=051f49d5176613dea88ecf73a101c3a99f4720e9 <87bb3e719042f0030a6dad39118c6a6b2a491ad9; version=6.12.5 <6.12.92; version=6.13; version=6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 <03cb001ef87b3f8d859cf7f96329acf3d6235d29; version=6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 <29cf64d128c94cf98d1c69d8b2962d39db5ff4c6; version=6b2d11e2d8fc130df4708be0b6b53fd3e6b54cf6 <510db031ba6eb40134f84c90ef963ea4b6dfb878

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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