CVE-2024-56673

Kernel panic via incorrect PMD destructor call

Published Dec 27, 2024 · Updated May 11, 2026

Denial of service in Linux 6.11 on RV64 allows local users to crash the kernel by tearing down a vmemmap page table. In remove_pgd_mapping, vmemmap teardown unconditionally calls the PMD destructor even though vmemmap_set_pmd created the table without the matching constructor. Local access and an RV64 kernel built with SPARSEMEM_VMEMMAP are required; successful triggering causes a kernel panic.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux 6.11 on RV64 allows local users to crash the kernel by tearing down a vmemmap page table. In remove_pgd_mapping, vmemmap teardown unconditionally calls the PMD destructor even though vmemmap_set_pmd created the table without the matching constructor. Local access and an RV64 kernel built with SPARSEMEM_VMEMMAP are required; successful triggering causes a kernel panic.

The record

CVE
CVE-2024-56673
Published
Dec 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 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=6.11
  2. Affected versionversion=c75a74f4ba19c904c0ae1e011ae2568449409ae4 <21f1b85c8912262adf51707e63614a114425eb10
  3. Affected versionversion=c75a74f4ba19c904c0ae1e011ae2568449409ae4 <344945806f2f7af68be98bac02836c867f223aa9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=c75a74f4ba19c904c0ae1e011ae2568449409ae4 <21f1b85c8912262adf51707e63614a114425eb10; version=c75a74f4ba19c904c0ae1e011ae2568449409ae4 <344945806f2f7af68be98bac02836c867f223aa9

Published CVSS scores

5.5CISA ADPCVSS: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 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

T1499.004Application or System Exploitation

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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