CVE-2007-4774Network attack vector

Policy bypass via SIGCONT ptrace wakeup

Published Jan 15, 2020 · Updated Aug 7, 2024

Race condition in the Linux kernel before 2.4.36-rc1 allows attackers to bypass ptrace-based syscall policies using SIGCONT signals. A SIGCONT signal wakes a TASK_STOPPED tracee, allowing its pending syscall to complete before the policy-enforcing parent can inspect or block it. A process must already be under ptrace-based policy control, and winning the narrow timing race permits one syscall to execute unchecked.

CVSS severity5.9
Medium
EPSS probability1.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel before 2.4.36-rc1 allows attackers to bypass ptrace-based syscall policies using SIGCONT signals. A SIGCONT signal wakes a TASK_STOPPED tracee, allowing its pending syscall to complete before the policy-enforcing parent can inspect or block it. A process must already be under ptrace-based policy control, and winning the narrow timing race permits one syscall to execute unchecked.

The record

CVE
CVE-2007-4774
Published
Jan 15, 2020
Updated
Aug 7, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1562.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

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 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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1562.001Impair Defenses: Disable or Modify Tools

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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