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CVE-2026-43171 (GCVE-0-2026-43171)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:27 – Updated: 2026-05-11 22:19
VLAI
Title
EFI/CPER: don't dump the entire memory region
Summary
In the Linux kernel, the following vulnerability has been resolved: EFI/CPER: don't dump the entire memory region The current logic at cper_print_fw_err() doesn't check if the error record length is big enough to handle offset. On a bad firmware, if the ofset is above the actual record, length -= offset will underflow, making it dump the entire memory. The end result can be: - the logic taking a lot of time dumping large regions of memory; - data disclosure due to the memory dumps; - an OOPS, if it tries to dump an unmapped memory region. Fix it by checking if the section length is too small before doing a hex dump. [ rjw: Subject tweaks ]
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 02de64ab54b4bb0f1b21bb324aeff3b08612be33 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 0e09b522f2622841389c3b2f9ac4969e35c0809d (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 64ae5aaa7ac93c83da456039e8ec747bfa8a7cff (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 5a9b1dda8481b82851a655c3bcc5b44879b95334 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 7780c0bad2a3a70a8c0113a33c02f4151d901eb3 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < a8419f5f2c5f2d80848ddabb2b95cf0da84a5f91 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 54e131db4cdffd946db890ff33ff2647053fd4f6 (git)
Affected: 3d8c11efd528d56972d44ed0de51c4e11a9a4fa9 , < 55cc6fe5716f678f06bcb95140882dfa684464ec (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.252 , ≤ 5.10.* (semver)
Unaffected: 5.15.202 , ≤ 5.15.* (semver)
Unaffected: 6.1.165 , ≤ 6.1.* (semver)
Unaffected: 6.6.128 , ≤ 6.6.* (semver)
Unaffected: 6.12.75 , ≤ 6.12.* (semver)
Unaffected: 6.18.16 , ≤ 6.18.* (semver)
Unaffected: 6.19.6 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-02T19:37:18+00:00",
      "cve": "CVE-2026-43171",
      "id": "CVE-2026-43171",
      "initial_release_date": "2026-05-06T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: EFI/CPER: don\u0027t dump the entire memory region",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43171.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:20:19Z",
      "cve": "CVE-2026-43171",
      "id": "CVE-2026-43171",
      "initial_release_date": "2026-05-07T02:17:28Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "554",
      "product_status:known_not_affected": "149",
      "product_status:recommended": "279",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43171",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43171.json",
      "version": "20"
    }
  }
}



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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.


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.