CVE-2024-49996Network attack vector

Kernel memory disclosure via NFS reparse length error

Published Oct 21, 2024 · Updated Aug 5, 2026

Out-of-bounds read in Linux kernel CIFS code allows remote attackers to disclose kernel memory or crash hosts via malformed NFS reparse data. The parser passes the full ReparseDataLength to cifs_strndup_from_utf16 without subtracting InodeType, so DataBuffer reads beyond its boundary; short buffers also expose absent InodeType or device fields. Exploitation requires a malicious SMB server or tampering with an unsigned SMB session and processing of its crafted reparse point by the client.

CVSS severity9.4
Critical
EPSS probability0.79%
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 kernel CIFS code allows remote attackers to disclose kernel memory or crash hosts via malformed NFS reparse data. The parser passes the full ReparseDataLength to cifs_strndup_from_utf16 without subtracting InodeType, so DataBuffer reads beyond its boundary; short buffers also expose absent InodeType or device fields. Exploitation requires a malicious SMB server or tampering with an unsigned SMB session and processing of its crafted reparse point by the client.

The record

CVE
CVE-2024-49996
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-120
Attack vector
network
Privileges
unauthenticated

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=5.3
  2. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <01cdddde39b065074fd48f07027757783cbf5b7d
  3. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <73b078e3314d4854fd8286f3ba65c860ddd3a3dd
  4. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <7b222d6cb87077faf56a687a72af1951cf78c8a9
  5. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <803b3a39cb096d8718c0aebc03fd19f11c7dc919
  6. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <c173d47b69f07cd7ca08efb4e458adbd4725d8e9
  7. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <c6db81c550cea0c73bd72ef55f579991e0e4ba07
  8. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <e2a8910af01653c1c268984855629d71fb81f404
  9. Affected versionversion=d5ecebc4900df7f6e8dff0717574668885110553 <ec79e6170bcae8a6036a4b6960f5e7e59a785601

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.3; version=d5ecebc4900df7f6e8dff0717574668885110553 <01cdddde39b065074fd48f07027757783cbf5b7d; version=d5ecebc4900df7f6e8dff0717574668885110553 <73b078e3314d4854fd8286f3ba65c860ddd3a3dd; version=d5ecebc4900df7f6e8dff0717574668885110553 <7b222d6cb87077faf56a687a72af1951cf78c8a9; version=d5ecebc4900df7f6e8dff0717574668885110553 <803b3a39cb096d8718c0aebc03fd19f11c7dc919; version=d5ecebc4900df7f6e8dff0717574668885110553 <c173d47b69f07cd7ca08efb4e458adbd4725d8e9; version=d5ecebc4900df7f6e8dff0717574668885110553 <c6db81c550cea0c73bd72ef55f579991e0e4ba07; version=d5ecebc4900df7f6e8dff0717574668885110553 <e2a8910af01653c1c268984855629d71fb81f404; version=d5ecebc4900df7f6e8dff0717574668885110553 <ec79e6170bcae8a6036a4b6960f5e7e59a785601

Published CVSS scores

9.4Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

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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