CVE-2024-26632

Kernel memory corruption via empty bio iteration

Published Mar 18, 2024 · Updated Aug 5, 2026

Memory corruption in the Linux kernel allows local users to read or modify kernel memory and crash the host through an empty block I/O request. The bio_first_folio() helper reads an uninitialized bio_vec for a zero-segment bio, and release paths dirty and unpin its stale page pointer. Ordinary local access is sufficient and no victim action is required; the stale pointer permits disclosure, a page-level write primitive, or a repeatable kernel oops.

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

Memory corruption in the Linux kernel allows local users to read or modify kernel memory and crash the host through an empty block I/O request. The bio_first_folio() helper reads an uninitialized bio_vec for a zero-segment bio, and release paths dirty and unpin its stale page pointer. Ordinary local access is sufficient and no victim action is required; the stale pointer permits disclosure, a page-level write primitive, or a repeatable kernel oops.

The record

CVE
CVE-2024-26632
Published
Mar 18, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 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=5.17
  2. Affected versionversion=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7
  3. Affected versionversion=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <a6bd8182137a12d22d3f2cee463271bdcb491659
  4. Affected versionversion=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <c6350b5cb78e9024c49eaee6fdb914ad2903a5fe
  5. Affected versionversion=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <ca3ede3f5893e2d26d4dbdef1eec28a8487fafde

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.17; version=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <7bed6f3d08b7af27b7015da8dc3acf2b9c1f21d7; version=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <a6bd8182137a12d22d3f2cee463271bdcb491659; version=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <c6350b5cb78e9024c49eaee6fdb914ad2903a5fe; version=640d1930bef4f87ec8d8d2b05f0f6edc1dfcf662 <ca3ede3f5893e2d26d4dbdef1eec28a8487fafde

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS: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

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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