CVE-2024-49873

Local kernel panic via THP sibling dereference

Published Oct 21, 2024 · Updated May 11, 2026

NULL pointer dereference in Linux 6.11 through 6.11.2 allows local users to trigger a kernel panic via a misaligned memfd THP pin request. filemap_get_folios_contig treats an XArray sibling value returned from the middle of a huge-page range as a folio and passes it to folio_try_get. Reaching the flaw requires low-privilege local access, THP-backed memfd memory, and a start offset that is not huge-page aligned; the bounded impact is host availability.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Linux 6.11 through 6.11.2 allows local users to trigger a kernel panic via a misaligned memfd THP pin request. filemap_get_folios_contig treats an XArray sibling value returned from the middle of a huge-page range as a folio and passes it to folio_try_get. Reaching the flaw requires low-privilege local access, THP-backed memfd memory, and a start offset that is not huge-page aligned; the bounded impact is host availability.

The record

CVE
CVE-2024-49873
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <570dd14bfecf281fa467c80f8ec92b26370ee36a
  3. Affected versionversion=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <c225c4f6056b46a8a5bf2ed35abf17a2d6887691

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <570dd14bfecf281fa467c80f8ec92b26370ee36a; version=89c1905d9c140372b7f50ef48f42378cf85d9bc5 <c225c4f6056b46a8a5bf2ed35abf17a2d6887691

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.5SUSECVSS: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.

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-476NULL Pointer Dereference
T1499Endpoint Denial of Service

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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