CVE-2026-31612 (GCVE-0-2026-31612)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-08-05 12:23
VLAI
Title
ksmbd: validate EaNameLength in smb2_get_ea()
Summary
In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate EaNameLength in smb2_get_ea() smb2_get_ea() reads ea_req->EaNameLength from the client request and passes it directly to strncmp() as the comparison length without verifying that the length of the name really is the size of the input buffer received. Fix this up by properly checking the size of the name based on the value received and the overall size of the request, to prevent a later strncmp() call to use the length as a "trusted" size of the buffer. Without this check, uninitialized heap values might be slowly leaked to the client.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 859f11e1bc81a4d32bb3ceeae54bcd296ac675d3 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 4b73376feecb3b61172fe5b4ff42bbbb8531669d (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 551dfb15b182abad4600eaf7b37e6eb7000d5b1b (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 3363a770b193f555f29d76ddf4ced3305c0ccf6d (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 243b206bcb5a7137e8bddd57b2eec81e1ebd3859 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < dfc6878d14acafffbe670bf2576620757a10a3d8 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 66751841212c2cc196577453c37f7774ff363f02 (git)
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Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.136 , ≤ 6.6.* (semver)
Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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      }
    },
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-06-28T11:19:30+00:00",
      "cve": "CVE-2026-31612",
      "id": "CVE-2026-31612",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ksmbd: validate EaNameLength in smb2_get_ea()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31612.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-06T01:24:13Z",
      "cve": "CVE-2026-31612",
      "id": "CVE-2026-31612",
      "initial_release_date": "2026-04-25T01:38:01Z",
      "product_status:known_not_affected": "298",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31612",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31612.json",
      "version": "8"
    }
  }
}



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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.