CVE-2024-49856

CPU hang via nonterminating SGX NUMA search

Published Oct 21, 2024 · Updated May 11, 2026

Infinite loop in the x86 SGX subsystem in affected Linux kernel versions allows local users to hang a CPU during EPC allocation. The NUMA fallback loop waits for the current node to reappear in sgx_numa_mask even when firmware assigned that node no EPC section, so its exit condition cannot be met after remote EPC sections fill. Exploitation requires local low-privileged access, SGX on a NUMA system, a current node without EPC memory, and exhaustion of EPC pages on other nodes; the result is a CPU soft lockup rather than data access or modification.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite loop in the x86 SGX subsystem in affected Linux kernel versions allows local users to hang a CPU during EPC allocation. The NUMA fallback loop waits for the current node to reappear in sgx_numa_mask even when firmware assigned that node no EPC section, so its exit condition cannot be met after remote EPC sections fill. Exploitation requires local low-privileged access, SGX on a NUMA system, a current node without EPC memory, and exhaustion of EPC pages on other nodes; the result is a CPU soft lockup rather than data access or modification.

The record

CVE
CVE-2024-49856
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-835, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=5.13
  2. Affected versionversion=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <0f89fb4042c08fd143bfc28af08bf6c8a0197eea
  3. Affected versionversion=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <20c96d0aaabfe361fc2a11c173968dc67feadbbf
  4. Affected versionversion=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <40fb64257dab507d86b5f1f2a62f3669ef0c91a8
  5. Affected versionversion=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <8132510c915815e6b537ab937d94ed66893bc7b8
  6. Affected versionversion=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <9c936844010466535bd46ea4ce4656ef17653644
  7. Affected versionversion=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <fb2d057539eda67ec7cfc369bf587e6518a9b99d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <0f89fb4042c08fd143bfc28af08bf6c8a0197eea; version=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <20c96d0aaabfe361fc2a11c173968dc67feadbbf; version=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <40fb64257dab507d86b5f1f2a62f3669ef0c91a8; version=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <8132510c915815e6b537ab937d94ed66893bc7b8; version=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <9c936844010466535bd46ea4ce4656ef17653644; version=901ddbb9ecf5425183ea0c09d10c2fd7868dce54 <fb2d057539eda67ec7cfc369bf587e6518a9b99d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

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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