CVE-2026-52993Network attack vector

Kernel memory corruption via TIPC skb double-free

Published Jun 24, 2026 · Updated Jun 24, 2026

Double-free in Linux Kernel TIPC allows remote attackers to corrupt kernel memory through malformed TIPC message reassembly. tipc_buf_append() passes a copied skb pointer to tipc_msg_validate(), which reallocates and frees the buffer before failure handling frees the stale original pointer again. The condition requires TIPC to be enabled and network-reachable; successful triggering performs the second free and corrupts kernel memory.

CVSS severity9.8
Critical
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in Linux Kernel TIPC allows remote attackers to corrupt kernel memory through malformed TIPC message reassembly. tipc_buf_append() passes a copied skb pointer to tipc_msg_validate(), which reallocates and frees the buffer before failure handling frees the stale original pointer again. The condition requires TIPC to be enabled and network-reachable; successful triggering performs the second free and corrupts kernel memory.

The record

CVE
CVE-2026-52993
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-415, CWE-763, T1210
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

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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=4.15
  2. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <0274f24485fc38032d4093e463dc3ff5c7a667c9
  3. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <1d5e589055880fae229e229e1929e087dbe08cf3
  4. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <29940fff14110ca48c5ccc168d121665b51bb778
  5. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <4d104882bc815d4ec666ace9155f5f52715879a6
  6. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <4ee4deadaae7cb2e3d53af0fc889cf92a73413c0
  7. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <a438975a6dcdbd70865978c021650d1485586f0b
  8. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a
  9. Affected versionversion=d618d09a68e4eed7a435beb2e355250f6f40664a <d3556656c6daebf8def751c7e71d11dd0a180d24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.15; version=d618d09a68e4eed7a435beb2e355250f6f40664a <0274f24485fc38032d4093e463dc3ff5c7a667c9; version=d618d09a68e4eed7a435beb2e355250f6f40664a <1d5e589055880fae229e229e1929e087dbe08cf3; version=d618d09a68e4eed7a435beb2e355250f6f40664a <29940fff14110ca48c5ccc168d121665b51bb778; version=d618d09a68e4eed7a435beb2e355250f6f40664a <4d104882bc815d4ec666ace9155f5f52715879a6; version=d618d09a68e4eed7a435beb2e355250f6f40664a <4ee4deadaae7cb2e3d53af0fc889cf92a73413c0; version=d618d09a68e4eed7a435beb2e355250f6f40664a <a438975a6dcdbd70865978c021650d1485586f0b; version=d618d09a68e4eed7a435beb2e355250f6f40664a <d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a; version=d618d09a68e4eed7a435beb2e355250f6f40664a <d3556656c6daebf8def751c7e71d11dd0a180d24

Published CVSS scores

9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0redhat-SADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-415Double Free
CWE-763Release of Invalid Pointer or Reference
T1210Exploitation of Remote Services

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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