CVE-2024-49988Network attack vector

Kernel memory misuse via freed connection dereference

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in Linux ksmbd allows remote authenticated users to reuse a freed connection during SMB multichannel oplock handling. The oplock-break path retains opinfo->conn without holding a ksmbd_conn reference, so another channel can free the connection before a pending request dereferences it. SMB access and multichannel activity are required; the public kernel record does not specify whether exploitation causes a crash, code execution, or data exposure.

CVSS severity8.8
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

Use-after-free in Linux ksmbd allows remote authenticated users to reuse a freed connection during SMB multichannel oplock handling. The oplock-break path retains opinfo->conn without holding a ksmbd_conn reference, so another channel can free the connection before a pending request dereferences it. SMB access and multichannel activity are required; the public kernel record does not specify whether exploitation causes a crash, code execution, or data exposure.

The record

CVE
CVE-2024-49988
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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=0626e6641f6b467447c81dd7678a69c66f7746cf <18f06bacc197d4ac9b518ad1c69999bc3d83e7aa
  2. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <9fd3cde4628bcd3549ab95061f2bab74d2ed4f3b
  3. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <e9dac92f4482a382e8c0fe1bc243da5fc3526b0c
  4. Affected versionversion=0626e6641f6b467447c81dd7678a69c66f7746cf <ee426bfb9d09b29987369b897fe9b6485ac2be27
  5. Affected versionversion=5.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0626e6641f6b467447c81dd7678a69c66f7746cf <18f06bacc197d4ac9b518ad1c69999bc3d83e7aa; version=0626e6641f6b467447c81dd7678a69c66f7746cf <9fd3cde4628bcd3549ab95061f2bab74d2ed4f3b; version=0626e6641f6b467447c81dd7678a69c66f7746cf <e9dac92f4482a382e8c0fe1bc243da5fc3526b0c; version=0626e6641f6b467447c81dd7678a69c66f7746cf <ee426bfb9d09b29987369b897fe9b6485ac2be27; version=5.15

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
8.8Linux CNACVSS:3.1/AV:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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