CVE-2024-58240Network attack vector

Remote memory corruption via shared kTLS wait state

Published Aug 28, 2025 · Updated Aug 19, 2026

Use-after-free in Linux kTLS and Siemens SIMATIC CN 4100 before V5.0 allows remote attackers to corrupt memory via TLS traffic. In tls_do_decryption, synchronous requests reused ctx->async_wait and shared asynchronous completion bookkeeping instead of a request-local crypto_wait. The condition remains reproducible on non-AVX systems using cryptd when the earlier socket-close race fix is absent; otherwise, the change is not independently user-triggerable.

CVSS severity9.8
Critical
EPSS probability0.32%
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 kTLS and Siemens SIMATIC CN 4100 before V5.0 allows remote attackers to corrupt memory via TLS traffic. In tls_do_decryption, synchronous requests reused ctx->async_wait and shared asynchronous completion bookkeeping instead of a request-local crypto_wait. The condition remains reproducible on non-AVX systems using cryptd when the earlier socket-close race fix is absent; otherwise, the change is not independently user-triggerable.

The record

CVE
CVE-2024-58240
Published
Aug 28, 2025
Updated
Aug 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 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=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <41532b785e9d79636b3815a64ddf6a096647d011
  2. Affected versionversion=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <48905146d11dbf1ddbb2967319016a83976953f5
  3. Affected versionversion=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <5f7761c94b1db7570cab328c9f940a33284509b7
  4. Affected versionversion=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <999115298017a675d8ddf61414fc7a85c89f1186
  5. Affected versionversion=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <dec5b6e7b211e405d3bcb504562ab21aa7e5a64d
  6. Affected versionversion=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <f32ab6cb544d01cdc150de5df389ac685aa507b0
  7. Affected versionversion=4.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <41532b785e9d79636b3815a64ddf6a096647d011; version=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <48905146d11dbf1ddbb2967319016a83976953f5; version=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <5f7761c94b1db7570cab328c9f940a33284509b7; version=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <999115298017a675d8ddf61414fc7a85c89f1186; version=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <dec5b6e7b211e405d3bcb504562ab21aa7e5a64d; version=3c4d7559159bfe1e3b94df3a657b2cda3a34e218 <f32ab6cb544d01cdc150de5df389ac685aa507b0; version=4.13
Siemens · SIMATIC CN 4100version=0 <V5.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.4Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3SiemensCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
9.8Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.3Amazon LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
7.8CanonicalCVSS:3.1/AV:L/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

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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