CVE-2026-68099Network attack vector

Out-of-bounds reads via truncated DACL size

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds read in Linux ksmbd allows remote authenticated users to trigger memory reads through crafted DACL data on an SMB share. The set_posix_acl_entries_dacl() and set_ntacl_dacl() loops retain the truncated sum written by check_add_overflow(), then set_ntacl_dacl() records a DACL size smaller than the ACE bytes already emitted. Reaching the flaw requires an authenticated SMB share, and the malformed ACL causes out-of-bounds reads when a client or ksmbd parses it.

CVSS severity4.2
Medium
EPSS probability0.17%
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 authenticated users to trigger memory reads through crafted DACL data on an SMB share. The set_posix_acl_entries_dacl() and set_ntacl_dacl() loops retain the truncated sum written by check_add_overflow(), then set_ntacl_dacl() records a DACL size smaller than the ACE bytes already emitted. Reaching the flaw requires an authenticated SMB share, and the malformed ACL causes out-of-bounds reads when a client or ksmbd parses it.

The record

CVE
CVE-2026-68099
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=299f962c0b02d048fb45d248b4da493d03f3175d <bbf0a8e931204ecdab494a88d43b0a24a04285c5
  2. Affected versionversion=299f962c0b02d048fb45d248b4da493d03f3175d <bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13
  3. Affected versionversion=41e53a773db6342ac9a689ee5ba635c31744c9f0
  4. Affected versionversion=5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43 <847ecd4eb3c117c3d2f13f1e7ab506543aad8183
  5. Affected versionversion=6.1.175 <6.2
  6. Affected versionversion=6.12.84 <6.12.101
  7. Affected versionversion=6.18.25 <6.18.42
  8. Affected versionversion=6.6.136 <6.6.148
  9. Affected versionversion=7.0.2 <7.1
  10. Affected versionversion=7.1
  11. Affected versionversion=8d5729350b236896f51379588d9a690b7fafb8db <f4fcd0c1a243d449307b887fafee23921e9db5ab
  12. Affected versionversion=e1955a94b6f17f4b058afa955a6f187eb3ed7615 <0bf38372821b1526f31538a7d9811844c55c7f38
  13. Affected versionversion=ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=299f962c0b02d048fb45d248b4da493d03f3175d <bbf0a8e931204ecdab494a88d43b0a24a04285c5; version=299f962c0b02d048fb45d248b4da493d03f3175d <bc90144ce8bb7fcf05ad9417c7adb4e9509d9e13; version=41e53a773db6342ac9a689ee5ba635c31744c9f0; version=5e7b8f3c539d69b2ed5f2408e2f75e68ce7eef43 <847ecd4eb3c117c3d2f13f1e7ab506543aad8183; version=6.1.175 <6.2; version=6.12.84 <6.12.101; version=6.18.25 <6.18.42; version=6.6.136 <6.6.148; version=7.0.2 <7.1; version=7.1; version=8d5729350b236896f51379588d9a690b7fafb8db <f4fcd0c1a243d449307b887fafee23921e9db5ab; version=e1955a94b6f17f4b058afa955a6f187eb3ed7615 <0bf38372821b1526f31538a7d9811844c55c7f38; version=ef7902be3f215b6bf7babe4dc9dd9a7d57dad7a7

Published CVSS scores

4.2Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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