CVE-2026-80543 (GCVE-0-2026-80543)

Vulnerability from cvelistv5 – Published: 2026-08-26 14:37 – Updated: 2026-08-26 14:37
VLAI
Title
s390/zcrypt: Pad trailing CCA or EP11 message with zeros
Summary
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Pad trailing CCA or EP11 message with zeros The both functions xcrb_msg_to_type6cprb_msgx() and xcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a kernel buffer based on the message length. But on further processing the message is supposed to be 4 byte length adjusted. Thus up to 3 bytes of uninitialized kernel memory are forwarded to further processing steps and may unwanted expose kernel memory to the crypto card firmware. This patch contains code to pad the gap between user space copied message and message buffer length sent down to further processing of the CCA or EP11 message to zeros.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2c6d91eb8b1533753755f07803e47eceed263d0 , < 2db92a56b000173d332b6c30f38a5a4444e4355a (git)
Affected: e2c6d91eb8b1533753755f07803e47eceed263d0 , < eb363254472493e3458156fc11fd56dca92f4333 (git)
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Linux Linux Affected: 7.1
Unaffected: 0 , < 7.1 (semver)
Unaffected: 7.1.10 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/zcrypt: Pad trailing CCA or EP11 message with zeros\n\nThe both functions xcrb_msg_to_type6cprb_msgx() and\nxcrb_msg_to_type6_ep11cprb_msgx() copy the user space message into a\nkernel buffer based on the message length. But on further processing\nthe message is supposed to be 4 byte length adjusted. Thus up to 3\nbytes of uninitialized kernel memory are forwarded to further\nprocessing steps and may unwanted expose kernel memory to the crypto\ncard firmware.\n\nThis patch contains code to pad the gap between user space copied\nmessage and message buffer length sent down to further processing of\nthe CCA or EP11 message to zeros."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-26T14:37:15.765Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/eb363254472493e3458156fc11fd56dca92f4333"
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    "cveId": "CVE-2026-80543",
    "datePublished": "2026-08-26T14:37:15.765Z",
    "dateReserved": "2026-08-26T14:34:25.765Z",
    "dateUpdated": "2026-08-26T14:37:15.765Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-27T08:56:58+00:00",
      "cve": "CVE-2026-80543",
      "id": "CVE-2026-80543",
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      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: s390/zcrypt: Pad trailing CCA or EP11 message with zeros",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80543.json",
      "version": "3"
    }
  }
}



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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.

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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