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CVE-2026-45994 (GCVE-0-2026-45994)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:55 – Updated: 2026-06-14 17:46
VLAI
Title
ibmasm: fix OOB reads in command_file_write due to missing size checks
Summary
In the Linux kernel, the following vulnerability has been resolved: ibmasm: fix OOB reads in command_file_write due to missing size checks The command_file_write() handler allocates a kernel buffer of exactly count bytes and copies user data into it, but does not validate the buffer against the dot command protocol before passing it to get_dot_command_size() and get_dot_command_timeout(). Since both the allocation size (count) and the header fields (command_size, data_size) are independently user-controlled, an attacker can cause get_dot_command_size() to return a value exceeding the allocation, triggering OOB reads in get_dot_command_timeout() and an out-of-bounds memcpy_toio() that leaks kernel heap memory to the service processor. Fix with two guards: reject writes smaller than sizeof(struct dot_command_header) before allocation, then after copying user data reject commands where the buffer is smaller than the total size declared by the header (sizeof(header) + command_size + data_size). This ensures all subsequent header and payload field accesses stay within the buffer.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 44ee19422aa82a6847594866de7e5a31e4ef98b3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7b8a574da5d7ea99b943f7a3458a17a1d95e8838 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d50e2019c9d7c433f56d9dff65703eb904aa1fb1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a672682d39dd34e2b5ba4feb436723bed65125ff (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < aefc1a97da17d8309974690c8a03e439a91ebb1c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ee5737891464030a189837467df3b81a273718ad (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d0fb4d1dc43f8d5179917a2daaa82680993d4cdf (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0eb09f737428e482a32a2e31e5e223f2b35a71d3 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:40:26+00:00",
      "cve": "CVE-2026-45994",
      "id": "CVE-2026-45994",
      "initial_release_date": "2026-05-27T00:00:00+00:00",
      "product_status:known_affected": "14",
      "product_status:known_not_affected": "260",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ibmasm: fix OOB reads in command_file_write due to missing size checks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45994.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:13:36Z",
      "cve": "CVE-2026-45994",
      "id": "CVE-2026-45994",
      "initial_release_date": "2026-05-28T03:54:44Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "649",
      "product_status:recommended": "277",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-45994",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-45994.json",
      "version": "16"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.