CVE-2026-63801Network attack vector

Memory disclosure or crash via asynchronous TIPC use-after-free

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in Linux Kernel TIPC crypto allows attackers to disclose kernel memory or crash systems through crafted encrypted network traffic. tipc_aead_decrypt() starts asynchronous decryption without holding a network-namespace reference, so tipc_aead_decrypt_done() reads freed per-namespace crypto state after teardown. Exploitation requires TIPC crypto with a bearer and cluster key, asynchronous crypto offload, crafted encrypted frames, and control over repeated network-namespace teardown; observed consequences are disclosure or a kernel crash.

CVSS severity8.8
High
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux Kernel TIPC crypto allows attackers to disclose kernel memory or crash systems through crafted encrypted network traffic. tipc_aead_decrypt() starts asynchronous decryption without holding a network-namespace reference, so tipc_aead_decrypt_done() reads freed per-namespace crypto state after teardown. Exploitation requires TIPC crypto with a bearer and cluster key, asynchronous crypto offload, crafted encrypted frames, and control over repeated network-namespace teardown; observed consequences are disclosure or a kernel crash.

The record

CVE
CVE-2026-63801
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=5.5
  2. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <0a780653b2a7569a7af9be7d0b00b1251baca63a
  3. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <171d31245d11bf84836fad3b394cb465a4d008ec
  4. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <1eea5e1820a2f5164d706bd1277bc97ff31ce32d
  5. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <2d1f21419ec121232c916d3a3fc9b6766473a0e7
  6. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <bda3348872a2ef0d19f2df6aa8cb5025adce2f20
  7. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <dca7713fe044a2067387948557ea099056e1679e
  8. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <e18769616fd5a90ec1e12aabbba544c488284292
  9. Affected versionversion=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <eaca7dae02fab70c8d223cffe03cec1b93249ce2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.5; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <0a780653b2a7569a7af9be7d0b00b1251baca63a; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <171d31245d11bf84836fad3b394cb465a4d008ec; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <1eea5e1820a2f5164d706bd1277bc97ff31ce32d; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <2d1f21419ec121232c916d3a3fc9b6766473a0e7; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <bda3348872a2ef0d19f2df6aa8cb5025adce2f20; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <dca7713fe044a2067387948557ea099056e1679e; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <e18769616fd5a90ec1e12aabbba544c488284292; version=fc1b6d6de2208774efd2a20bf0daddb02d18b1e0 <eaca7dae02fab70c8d223cffe03cec1b93249ce2

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:N/AC:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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