CVE-2026-68473 (GCVE-0-2026-68473)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:51 – Updated: 2026-08-17 05:39
VLAI
Title
powerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address()
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address() mask_user_address() incorrectly checks for CONFIG_E500 instead of CONFIG_PPC_E500, causing mask_user_address_isel() to not be used on E500 hardware. Fix the check to use the correct name.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 861574d51bbd7a06dbf07f658a9a8def012c2f74 , < d5c234774a82f27b594f70c15fc45ce3648e4295 (git)
Affected: 861574d51bbd7a06dbf07f658a9a8def012c2f74 , < d610d3ab18197d87618da11ec5fe8b3cebf32208 (git)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - Exploitation requires invoking local syscalls (read/write/ioctl/futex/socket) that reach masked uaccess helpers; the bug is in arch/powerpc uaccess.h and is not triggered by remote packet handling alone.\nAC:L - On affected PPC_E500 kernels (7.0+), any user pointer with bit 31 set reliably redirects to 0x80000000 on masked copy/futex paths without races or rare layout wins.\nPR:L - Any unprivileged local process can pass crafted userspace pointers into copy_from_user, strncpy_from_user, iov_iter, futex_wake_op, and scoped socket/scm helpers that use masked_user_access_begin.\nUI:N - No victim interaction is required; exploitation is achieved entirely through attacker-controlled syscall arguments and memory mappings.\nS:U - Impact is confined to kernel/user memory boundaries on the same host (cross-process read/write via misdirected uaccess), not a hypervisor or separate security authority escape.\nC:H - Wrong masking lets masked copy_from_user/strncpy_from_user read from 0x80000000 instead of the supplied high user or kernel-range pointer, enabling kernel-mediated disclosure of other mappings at that fixed address.\nI:H - Masked futex atomic ops and scoped user writes on mis-masked pointers can modify memory at 0x80000000 rather than the validated target, corrupting synchronization state or arbitrary user data.\nA:H - Misdirected user accesses can trigger KUAP/KUEP faults, WARN paths, or persistent futex corruption, causing kernel oops/panics or denial of service on embedded E500 systems."
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        "dateUpdated": "2026-08-17T05:39:16.211Z",
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        "shortName": "Linux"
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    "cveId": "CVE-2026-68473",
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    "dateReserved": "2026-07-30T09:28:09.396Z",
    "dateUpdated": "2026-08-17T05:39:16.211Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T15:28:37+00:00",
      "cve": "CVE-2026-68473",
      "id": "CVE-2026-68473",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: powerpc/uaccess: correct check for CONFIG_PPC_E500 in mask_user_address()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68473.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.

Sightings

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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.
  • 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.


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