CVE-2026-43350 (GCVE-0-2026-43350)

Vulnerability from cvelistv5 – Published: 2026-05-08 13:41 – Updated: 2026-08-05 12:27
VLAI
Title
smb: client: require a full NFS mode SID before reading mode bits
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits. That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE. Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.
Severity
7.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < 23b54d6cc3ef30a51d984dc74364f24039ae2ecb (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < 1592a6cd6f653f2d24572a6976c7a775b19f4940 (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < 8bd4cad3f458d11650d51c2d24b03fb1770ae6cc (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < b53b8e98c23310294fc45fc686db5ee860311896 (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < c8eef12af1cc73031639ea7cf16e0b10e2536b0b (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < 38a69f08ee82c450d3e4168707fff2e317dc3ff7 (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < f8488c07bea2431ee12a6067d736578064fa46b4 (git)
Affected: e2f8fbfb8d09c06decde162090fac3ee220aa280 , < 2757ad3e4b6f9e0fed4c7739594e702abc5cab21 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.84 , ≤ 6.12.* (semver)
Unaffected: 6.18.25 , ≤ 6.18.* (semver)
Unaffected: 7.0.2 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: smb: client: require a full NFS mode SID before reading mode bits",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43350.json",
      "version": "3"
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      "cve": "CVE-2026-43350",
      "id": "CVE-2026-43350",
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      "product_status:known_affected": "289",
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      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43350",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43350.json",
      "version": "5"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.