CVE-2026-68134 (GCVE-0-2026-68134)

Vulnerability from cvelistv5 – Published: 2026-08-10 11:58 – Updated: 2026-08-17 04:59
VLAI
Title
ptp: ptp_s390: Add missing facility check
Summary
In the Linux kernel, the following vulnerability has been resolved: ptp: ptp_s390: Add missing facility check Only register the physical clock when facility 28 is installed and PTFF QAF returns that PTFF QPT is available.
Severity
7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2d7de7a3010d713fb89b7ba99e6fdc14475ad106 , < b3efb4744abf493c9782eae713b861a80d9bbeca (git)
Affected: 2d7de7a3010d713fb89b7ba99e6fdc14475ad106 , < 545a7fdbc110c82933d448db2695abff07536f08 (git)
Affected: 2d7de7a3010d713fb89b7ba99e6fdc14475ad106 , < e78f1ac37afcb16cb6fef8a2c92591eab6558956 (git)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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            "baseSeverity": "HIGH",
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            "version": "3.1"
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          "scenarios": [
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              "lang": "en",
              "value": "AV:L - The bug is reached only via local PTP character-device access: open(/dev/ptpX) followed by ioctl paths such as PTP_SYS_OFFSET or clock_gettime on the posix clock FD, which call ptp_s390_qpt_gettime() and execute the PTFF instruction in kernel context.\nAC:L - On affected IBM Z systems with the s390 PTP driver enabled, any process that can open the physical-clock device can repeatedly issue read ioctls that deterministically invoke PTFF without races or attacker-uncontrollable timing.\nPR:L - PTP read ioctls and clock_gettime do not require CAP_SYS_TIME; on typical chrony/ptp4l and containerized time-sync deployments /dev/ptp* is often opened by non-root service accounts or passed into unprivileged workloads, not only init-namespace root.\nUI:N - Exploitation requires only the attacker (or their service account) opening the PTP device and issuing ioctls; no separate victim action such as mounting a filesystem or clicking a prompt is needed.\nS:U - Impact is confined to the same Linux kernel running the ptp_s390 driver on the s390 host; it does not cross a VM, IOMMU, or other security boundary to another authority.\nC:H - When PTFF QPT is unavailable the driver still calls ptff() and returns the unchecked stack buffer to userspace, leaking kernel memory; on systems without facility 28 the illegal PTFF traps in kernel mode and can expose register/state data during the fault path.\nI:L - Returning attacker-influenced or uninitialized PTFF output as authoritative PTP time via ioctl can corrupt time-sync decisions for chrony/ptp4l and other consumers that steer system clocks from the physical-clock device.\nA:H - Executing PTFF without facility 28 or on unsupported configurations triggers an s390 program check in kernel context (illegal/specification exception) that ends in die(), causing a kernel oops/panic and total loss of host availability."
            }
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        "dateUpdated": "2026-08-17T04:59:26.371Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "assignerShortName": "Linux",
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    "datePublished": "2026-08-10T11:58:57.504Z",
    "dateReserved": "2026-07-30T09:28:09.370Z",
    "dateUpdated": "2026-08-17T04:59:26.371Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
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      "current_release_date": "2026-08-14T14:00:46+00:00",
      "cve": "CVE-2026-68134",
      "id": "CVE-2026-68134",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ptp: ptp_s390: Add missing facility check",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68134.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-18T16:56:23Z",
      "cve": "CVE-2026-68134",
      "id": "CVE-2026-68134",
      "initial_release_date": "2026-08-18T16:56:23Z",
      "product_status:known_affected": "12",
      "product_status:known_not_affected": "284",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68134",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68134.json",
      "version": "2"
    }
  }
}



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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.

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.