CVE-2024-26795

Kernel memory corruption via unoffset vmemmap base

Published Apr 4, 2024 · Updated Aug 5, 2026

Linux RISC-V sparse-memory vmemmap allows local users to disclose or corrupt kernel memory through ordinary memory operations. The pfn_to_page() and page_to_pfn() macros use a vmemmap base that is not offset to the first physical page, producing out-of-bounds struct page addresses for valid DRAM bases. A low-privileged local process is sufficient; exploitation exposes kernel data, corrupts memory, or crashes the system.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Linux RISC-V sparse-memory vmemmap allows local users to disclose or corrupt kernel memory through ordinary memory operations. The pfn_to_page() and page_to_pfn() macros use a vmemmap base that is not offset to the first physical page, producing out-of-bounds struct page addresses for valid DRAM bases. A low-privileged local process is sufficient; exploitation exposes kernel data, corrupts memory, or crashes the system.

The record

CVE
CVE-2024-26795
Published
Apr 4, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.4
  2. Affected versionversion=d95f1a542c3df396137afa217ef9bd39cb8931ca <2a1728c15ec4f45ed9248ae22f626541c179bfbe
  3. Affected versionversion=d95f1a542c3df396137afa217ef9bd39cb8931ca <5941a90c55d3bfba732b32208d58d997600b44ef
  4. Affected versionversion=d95f1a542c3df396137afa217ef9bd39cb8931ca <8310080799b40fd9f2a8b808c657269678c149af
  5. Affected versionversion=d95f1a542c3df396137afa217ef9bd39cb8931ca <a11dd49dcb9376776193e15641f84fcc1e5980c9
  6. Affected versionversion=d95f1a542c3df396137afa217ef9bd39cb8931ca <a278d5c60f21aa15d540abb2f2da6e6d795c3e6e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=d95f1a542c3df396137afa217ef9bd39cb8931ca <2a1728c15ec4f45ed9248ae22f626541c179bfbe; version=d95f1a542c3df396137afa217ef9bd39cb8931ca <5941a90c55d3bfba732b32208d58d997600b44ef; version=d95f1a542c3df396137afa217ef9bd39cb8931ca <8310080799b40fd9f2a8b808c657269678c149af; version=d95f1a542c3df396137afa217ef9bd39cb8931ca <a11dd49dcb9376776193e15641f84fcc1e5980c9; version=d95f1a542c3df396137afa217ef9bd39cb8931ca <a278d5c60f21aa15d540abb2f2da6e6d795c3e6e

Published CVSS scores

7.8Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

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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