CVE-2024-26583

Kernel crash via asynchronous TLS socket race

Published Feb 21, 2024 · Updated Aug 5, 2026

Use-after-free in affected Linux kernel TLS releases allows local users to crash the kernel by racing async crypto completion with socket close. The kTLS software paths in net/tls/tls_sw.c allow the recvmsg or sendmsg thread to exit after the asynchronous handler calls complete(), leaving later handler code to access freed request data. Reachability requires local socket operations using asynchronous kTLS crypto, and the documented consequence is a kernel panic rather than data disclosure or modification.

CVSS severity9.8
Critical
EPSS probability0.55%
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 affected Linux kernel TLS releases allows local users to crash the kernel by racing async crypto completion with socket close. The kTLS software paths in net/tls/tls_sw.c allow the recvmsg or sendmsg thread to exit after the asynchronous handler calls complete(), leaving later handler code to access freed request data. Reachability requires local socket operations using asynchronous kTLS crypto, and the documented consequence is a kernel panic rather than data disclosure or modification.

The record

CVE
CVE-2024-26583
Published
Feb 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=0cada33241d9de205522e3858b18e506ca5cce2c <6209319b2efdd8524691187ee99c40637558fa33
  2. Affected versionversion=0cada33241d9de205522e3858b18e506ca5cce2c <7a3ca06d04d589deec81f56229a9a9d62352ce01
  3. Affected versionversion=0cada33241d9de205522e3858b18e506ca5cce2c <86dc27ee36f558fe223dbdfbfcb6856247356f4a
  4. Affected versionversion=0cada33241d9de205522e3858b18e506ca5cce2c <aec7961916f3f9e88766e2688992da6980f11b8d
  5. Affected versionversion=0cada33241d9de205522e3858b18e506ca5cce2c <f17d21ea73918ace8afb9c2d8e734dbf71c2c9d7
  6. Affected versionversion=5.4.44 <5.5
  7. Affected versionversion=5.6.16 <5.7
  8. Affected versionversion=5.7
  9. Affected versionversion=9b81d43da15e56ed89f083f326561acdcaf549ce
  10. Affected versionversion=cf4cc95a15f599560c7abd89095a7973a4b9cec3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0cada33241d9de205522e3858b18e506ca5cce2c <6209319b2efdd8524691187ee99c40637558fa33; version=0cada33241d9de205522e3858b18e506ca5cce2c <7a3ca06d04d589deec81f56229a9a9d62352ce01; version=0cada33241d9de205522e3858b18e506ca5cce2c <86dc27ee36f558fe223dbdfbfcb6856247356f4a; version=0cada33241d9de205522e3858b18e506ca5cce2c <aec7961916f3f9e88766e2688992da6980f11b8d; version=0cada33241d9de205522e3858b18e506ca5cce2c <f17d21ea73918ace8afb9c2d8e734dbf71c2c9d7; version=5.4.44 <5.5; version=5.6.16 <5.7; version=5.7; version=9b81d43da15e56ed89f083f326561acdcaf549ce; version=cf4cc95a15f599560c7abd89095a7973a4b9cec3

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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