CVE-2024-42280

Kernel compromise via freed skb dereference

Published Aug 17, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux mISDN driver allows local users to compromise kernel confidentiality, integrity, and availability. hfcmulti_tx frees the skb referenced by *sp and then passes its stale length and data pointer to write_fifo, consuming reclaimed kernel memory. An unprivileged user can reach the path through an AF_ISDN datagram socket with two queued sendmsg calls, enabling disclosure, corruption, or a kernel panic.

CVSS severity7.8
High
EPSS probability0.24%
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 the Linux mISDN driver allows local users to compromise kernel confidentiality, integrity, and availability. hfcmulti_tx frees the skb referenced by *sp and then passes its stale length and data pointer to write_fifo, consuming reclaimed kernel memory. An unprivileged user can reach the path through an AF_ISDN datagram socket with two queued sendmsg calls, enabling disclosure, corruption, or a kernel panic.

The record

CVE
CVE-2024-42280
Published
Aug 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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=2.6.27
  2. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <4d8b642985ae24f4b3656438eb8489834a17bb80
  3. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <61ab751451f5ebd0b98e02276a44e23a10110402
  4. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <70db2c84631f50e02e6b32b543700699dd395803
  5. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <7e4a539bca7d8d20f2c5d93c18cce8ef77cd78e0
  6. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <8f4030277dfb9dbe04fd78566b19931097c9d629
  7. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <9460ac3dd1ae033bc2b021a458fb535a0c36ddb2
  8. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <d3e4d4a98c5629ccdcb762a0ff6c82ba9738a0c3
  9. Affected versionversion=af69fb3a8ffa37e986db00ed93099dc44babeef4 <ddc79556641ee070d36be0de4a1f0a16a71f1fc7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.27; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <4d8b642985ae24f4b3656438eb8489834a17bb80; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <61ab751451f5ebd0b98e02276a44e23a10110402; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <70db2c84631f50e02e6b32b543700699dd395803; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <7e4a539bca7d8d20f2c5d93c18cce8ef77cd78e0; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <8f4030277dfb9dbe04fd78566b19931097c9d629; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <9460ac3dd1ae033bc2b021a458fb535a0c36ddb2; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <d3e4d4a98c5629ccdcb762a0ff6c82ba9738a0c3; version=af69fb3a8ffa37e986db00ed93099dc44babeef4 <ddc79556641ee070d36be0de4a1f0a16a71f1fc7

Published CVSS scores

7.8NIST NVDCVSS: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

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

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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