CVE-2026-52974Network attack vector

Service interruption via leaked TLS anchor buffers

Published Jun 24, 2026 · Updated Jun 24, 2026

Memory leak in the Linux kernel TLS receive-offload path allows remote attackers to interrupt services through repeated failed setup. The tls_sw_free_resources_rx() cleanup stops the strparser and frees its context but does not release the anchor skb allocated by tls_strp_init(). Reachability requires a kTLS-enabled network service and a receive-offload-capable NIC; repeated failures consume kernel memory and interrupt hosted services.

CVSS severity7.5
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in the Linux kernel TLS receive-offload path allows remote attackers to interrupt services through repeated failed setup. The tls_sw_free_resources_rx() cleanup stops the strparser and frees its context but does not release the anchor skb allocated by tls_strp_init(). Reachability requires a kTLS-enabled network service and a receive-offload-capable NIC; repeated failures consume kernel memory and interrupt hosted services.

The record

CVE
CVE-2026-52974
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.0
  2. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <0c9f399b37ce22a5ed94cc51f03ed07ac7f38e32
  3. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <3c405dfa9619e506e75b8e41f8b29a5b99731877
  4. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <58689498ca3384851145a754dbb1d8ed1cf9fb54
  5. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <688f12aa44511dd57e448eb670075c6302ad1dc1
  6. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <9c54e76f8d6eb11735918777ef0e0509e089557d
  7. Affected versionversion=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <bd07fe6c38b9e44ff3fc02692a53f095c5cc9afc

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <0c9f399b37ce22a5ed94cc51f03ed07ac7f38e32; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <3c405dfa9619e506e75b8e41f8b29a5b99731877; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <58689498ca3384851145a754dbb1d8ed1cf9fb54; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <688f12aa44511dd57e448eb670075c6302ad1dc1; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <9c54e76f8d6eb11735918777ef0e0509e089557d; version=84c61fe1a75b4255df1e1e7c054c9e6d048da417 <bd07fe6c38b9e44ff3fc02692a53f095c5cc9afc

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.003Application Exhaustion Flood

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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