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CVE-2026-72089 (GCVE-0-2026-72089)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-17 05:40
VLAI
Title
accel/ivpu: Reject firmware log with size smaller than header
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/ivpu: Reject firmware log with size smaller than header fw_log_from_bo() validates the tracing buffer header_size and that the log fits within the BO, but never checks that log->size is at least log->header_size. fw_log_print_buffer() then computes: u32 data_size = log->size - log->header_size; which underflows to a near-U32_MAX value when firmware reports a log whose size is smaller than its header. That huge data_size defeats the log_start/log_end bounds clamps added by commit dd1311bcf0e6 ("accel/ivpu: Add bounds checks for firmware log indices"), so fw_log_print_lines() reads far past the small real data region of the BO. A size of 0 also makes fw_log_from_bo() advance the offset by 0, causing the callers to loop forever on the same header. Reject logs whose size is smaller than the header (which also rejects size == 0).
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: d4e4257afa6ed5205eda993180401fc2c20e4b60 , < 5592a207e158b738d9c1d27f208dbbea13ae7606 (git)
Affected: d4e4257afa6ed5205eda993180401fc2c20e4b60 , < dc9a1cda2e46d0254730a6f93cfe48532895f33c (git)
Affected: d4e4257afa6ed5205eda993180401fc2c20e4b60 , < 257321a1c036da417f5d9c47b95c7e58f62bf263 (git)
Affected: d4e4257afa6ed5205eda993180401fc2c20e4b60 , < 6920e62be4c969a68ce4ebc59da68c6cbc9512e5 (git)
Affected: d4e4257afa6ed5205eda993180401fc2c20e4b60 , < ddb44baed257560f192b145ed36cf8c0a412de47 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 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\naccel/ivpu: Reject firmware log with size smaller than header\n\nfw_log_from_bo() validates the tracing buffer header_size and that the\nlog fits within the BO, but never checks that log-\u003esize is at least\nlog-\u003eheader_size. fw_log_print_buffer() then computes:\n\n  u32 data_size = log-\u003esize - log-\u003eheader_size;\n\nwhich underflows to a near-U32_MAX value when firmware reports a log whose\nsize is smaller than its header. That huge data_size defeats the\nlog_start/log_end bounds clamps added by commit dd1311bcf0e6 (\"accel/ivpu:\nAdd bounds checks for firmware log indices\"), so fw_log_print_lines() reads\nfar past the small real data region of the BO. A size of 0 also makes\nfw_log_from_bo() advance the offset by 0, causing the callers to loop\nforever on the same header.\n\nReject logs whose size is smaller than the header (which also rejects\nsize == 0)."
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              "value": "AV:L - The bug is in Intel NPU (ivpu) firmware log parsing reached only via local debugfs reads/writes or automatic driver recovery/coredump paths after submitting work through the DRM render node; there is no network-facing entry point.\nAC:L - An unprivileged local user can repeatedly submit NPU jobs to provoke firmware faults/timeouts that leave malformed tracing headers and then reliably trigger kernel log parsing during recovery, coredump, or fw_log access without depending on uncontrollable timing or layout.\nPR:L - Exploitation requires only standard local access to the Intel NPU DRM render node to submit inference jobs and provoke recovery; it does not require root/CAP_SYS_ADMIN, and the device is not reachable from unprivileged user namespaces.\nUI:N - No victim interaction is required; the attacker triggers malformed firmware log processing themselves via job submission and the resulting automatic recovery/coredump path or by reading debugfs fw_log.\nS:U - Impact is confined to kernel memory and availability on the same host running the ivpu driver; it does not cross VM, container, or IOMMU security boundaries.\nC:H - Integer underflow makes data_size wrap to ~U32_MAX, bypassing index clamps so fw_log_print_lines performs a massive out-of-bounds read past the tracing BO and can disclose adjacent kernel memory via drm_printf/coredump output.\nI:N - The flaw is an out-of-bounds read and possible infinite loop during parsing; it does not provide an arbitrary kernel write, code execution, or other integrity-modifying primitive.\nA:H - A near-U32_MAX read can oops/panic the kernel when accessing unmapped memory, and log size 0 prevents offset advancement causing an infinite loop in fw_log_print_all_in_bo during coredump, reset, or debugfs access, hanging the system."
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    "datePublished": "2026-08-15T05:52:36.800Z",
    "dateReserved": "2026-08-09T03:40:39.905Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T21:41:29+00:00",
      "cve": "CVE-2026-72089",
      "id": "CVE-2026-72089",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: accel/ivpu: Reject firmware log with size smaller than header",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72089.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.


Detection rules are retrieved from Rulezet.