CVE-2024-26736Network attack vector

Kernel memory corruption via undersized AFS buffer

Published Apr 3, 2024 · Updated Aug 5, 2026

Out-of-bounds write in the Linux kernel AFS client 4.15 and later allows remote attackers to corrupt kernel memory through AFS replies. The afs_update_volume_status() function uses sprintf() to place a decimal volume identifier in a 16-byte stack buffer, although the stated maximum requires 21 bytes including termination. Reachability requires a malicious or spoofed AFS server response, but current CNA analysis finds the wire identifier limited to 32 bits and therefore too short to overflow the buffer.

CVSS severity8.1
High
EPSS probability0.72%
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 write in the Linux kernel AFS client 4.15 and later allows remote attackers to corrupt kernel memory through AFS replies. The afs_update_volume_status() function uses sprintf() to place a decimal volume identifier in a 16-byte stack buffer, although the stated maximum requires 21 bytes including termination. Reachability requires a malicious or spoofed AFS server response, but current CNA analysis finds the wire identifier limited to 32 bits and therefore too short to overflow the buffer.

The record

CVE
CVE-2024-26736
Published
Apr 3, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 3, 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

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=4.15
  2. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5
  3. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <6e6065dd25b661420fac19c34282b6c626fcd35e
  4. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d
  5. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <d34a5e57632bb5ff825196ddd9a48ca403626dfa
  6. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <d9b5e2b7a8196850383c70d099bfd39e81ab6637
  7. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <e56662160fc24d28cb75ac095cc6415ae1bda43e
  8. Affected versionversion=d2ddc776a4581d900fc3bdc7803b403daae64d88 <e8530b170e464017203e3b8c6c49af6e916aece1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <5c27d85a69fa16a08813ba37ddfb4bbc9a1ed6b5; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <6e6065dd25b661420fac19c34282b6c626fcd35e; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <6ea38e2aeb72349cad50e38899b0ba6fbcb2af3d; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <d34a5e57632bb5ff825196ddd9a48ca403626dfa; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <d9b5e2b7a8196850383c70d099bfd39e81ab6637; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <e56662160fc24d28cb75ac095cc6415ae1bda43e; version=d2ddc776a4581d900fc3bdc7803b403daae64d88 <e8530b170e464017203e3b8c6c49af6e916aece1

Published CVSS scores

8.1Linux kernel CNACVSS:3.1/AV:N/AC:H/PR:N/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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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