CVE-2024-26980Network attack vector

Kernel service interruption via undersized SMB2 transform request

Published May 1, 2024 · Updated Aug 5, 2026

Out-of-bounds read in Linux ksmbd allows remote attackers to interrupt service via a malformed SMB2 transform request over TCP/445. Before size validation, smb2_allocate_rsp_buf() interprets an undersized transform PDU as an smb2_query_info_req and reads two bytes beyond the slab object to choose response-buffer size. A first unauthenticated packet reaches the path; the over-read exposes an allocation/timing oracle and can panic hosts configured to treat memory-safety faults as fatal.

CVSS severity8.2
High
EPSS probability0.62%
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 Linux ksmbd allows remote attackers to interrupt service via a malformed SMB2 transform request over TCP/445. Before size validation, smb2_allocate_rsp_buf() interprets an undersized transform PDU as an smb2_query_info_req and reads two bytes beyond the slab object to choose response-buffer size. A first unauthenticated packet reaches the path; the over-read exposes an allocation/timing oracle and can panic hosts configured to treat memory-safety faults as fatal.

The record

CVE
CVE-2024-26980
Published
May 1, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 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=0626e6641f6b467447c81dd7678a69c66f7746cf <0977f89722eceba165700ea384f075143f012085
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <3160d9734453a40db248487f8204830879c207f1
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <b80ba648714e6d790d69610cf14656be222d0248
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <c119f4ede3fa90a9463f50831761c28f989bfb20
  5. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <da21401372607c49972ea87a6edaafb36a17c325
  6. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <0977f89722eceba165700ea384f075143f012085; version=0626e6641f6b467447c81dd7678a69c66f7746cf <3160d9734453a40db248487f8204830879c207f1; version=0626e6641f6b467447c81dd7678a69c66f7746cf <b80ba648714e6d790d69610cf14656be222d0248; version=0626e6641f6b467447c81dd7678a69c66f7746cf <c119f4ede3fa90a9463f50831761c28f989bfb20; version=0626e6641f6b467447c81dd7678a69c66f7746cf <da21401372607c49972ea87a6edaafb36a17c325; version=5.15

Published CVSS scores

8.2Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
5.5CISA-ADPCVSS: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 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-125Out-of-bounds Read
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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