CVE-2024-39277

Out-of-bounds read via NUMA sentinel mishandling

Published Jun 21, 2024 · Updated May 11, 2026

Out-of-bounds read in the Linux kernel allows local users to trigger invalid memory access through the DMA benchmark debugfs ioctl. The do_map_benchmark function passes the NUMA_NO_NODE sentinel value of -1 to cpumask_of_node, which indexes a per-node cpumask array without handling that sentinel. Low-privileged local access to the ioctl is required; public records establish the invalid read but do not demonstrate reliable data disclosure or privilege escalation.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the Linux kernel allows local users to trigger invalid memory access through the DMA benchmark debugfs ioctl. The do_map_benchmark function passes the NUMA_NO_NODE sentinel value of -1 to cpumask_of_node, which indexes a per-node cpumask array without handling that sentinel. Low-privileged local access to the ioctl is required; public records establish the invalid read but do not demonstrate reliable data disclosure or privilege escalation.

The record

CVE
CVE-2024-39277
Published
Jun 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 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=5.11
  2. Affected versionversion=65789daa8087e125927230ccb7e1eab13999b0cf <50ee21bfc005e69f183d6b4b454e33f0c2571e1f
  3. Affected versionversion=65789daa8087e125927230ccb7e1eab13999b0cf <5a91116b003175302f2e6ad94b76fb9b5a141a41
  4. Affected versionversion=65789daa8087e125927230ccb7e1eab13999b0cf <8e1ba9df9a35e8dc64f657a64e523c79ba01e464
  5. Affected versionversion=65789daa8087e125927230ccb7e1eab13999b0cf <b41b0018e8ca06e985e87220a618ec633988fd13
  6. Affected versionversion=65789daa8087e125927230ccb7e1eab13999b0cf <e64746e74f717961250a155e14c156616fcd981f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=65789daa8087e125927230ccb7e1eab13999b0cf <50ee21bfc005e69f183d6b4b454e33f0c2571e1f; version=65789daa8087e125927230ccb7e1eab13999b0cf <5a91116b003175302f2e6ad94b76fb9b5a141a41; version=65789daa8087e125927230ccb7e1eab13999b0cf <8e1ba9df9a35e8dc64f657a64e523c79ba01e464; version=65789daa8087e125927230ccb7e1eab13999b0cf <b41b0018e8ca06e985e87220a618ec633988fd13; version=65789daa8087e125927230ccb7e1eab13999b0cf <e64746e74f717961250a155e14c156616fcd981f
The Linux Kernel Organization · Linux Kernelversion=5.11; version=65789daa8087 <50ee21bfc005; version=65789daa8087 <5a91116b0031; version=65789daa8087 <8e1ba9df9a35; version=65789daa8087 <b41b0018e8ca; version=65789daa8087 <e64746e74f71

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Canonical UbuntuCVSS: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

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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-125Out-of-bounds Read

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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