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CVE-2026-74452 (GCVE-0-2026-74452)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:26 – Updated: 2026-08-17 05:47
VLAI
Title
drm/panthor: reject firmware sections with oversized data
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/panthor: reject firmware sections with oversized data In panthor_fw_load_section_entry(), the data size to copy is calculated without validating it against the allocated section_size: section->data.size = hdr.data.end - hdr.data.start; If a crafted firmware sets data.size larger than the allocated memory, this could cause a heap buffer overflow in panthor_fw_init_section_mem() memcpy(section->mem->kmap, section->data.buf, section->data.size); Additionally, if the section->data.size exceeds the BO size, could this memset underflow the size calculation, leading to a massive out-of-bounds zeroing of kernel memory? memset(section->mem->kmap + section->data.size, 0, panthor_kernel_bo_size(section->mem) - section->data.size); Reject section entries whose initial data is larger than the section size.
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: 2718d91816eeed03c09c8abe872e45f59078768c , < 0e57165ca025a67d8dfd17efd2765fdd4925fdab (git)
Affected: 2718d91816eeed03c09c8abe872e45f59078768c , < 2a761b9be5863e1d26a584f0c2d1e114a684ed9a (git)
Affected: 2718d91816eeed03c09c8abe872e45f59078768c , < 7f4674d986c15c74327cb6ac6e2e2afecf061e04 (git)
Affected: 2718d91816eeed03c09c8abe872e45f59078768c , < a3caaa06809248b996254be5b47e10804a3494e2 (git)
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Linux Linux Affected: 6.10
Unaffected: 0 , < 6.10 (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/panthor/panthor_fw.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panthor: reject firmware sections with oversized data\n\nIn panthor_fw_load_section_entry(), the data size to copy is calculated\nwithout validating it against the allocated section_size:\n\n    section-\u003edata.size = hdr.data.end - hdr.data.start;\n\nIf a crafted firmware sets data.size larger than the allocated memory,\nthis could cause a heap buffer overflow in panthor_fw_init_section_mem()\n\n    memcpy(section-\u003emem-\u003ekmap, section-\u003edata.buf, section-\u003edata.size);\n\nAdditionally, if the section-\u003edata.size exceeds the BO size, could this\nmemset underflow the size calculation, leading to a massive out-of-bounds\nzeroing of kernel memory?\n\n    memset(section-\u003emem-\u003ekmap + section-\u003edata.size, 0,\n           panthor_kernel_bo_size(section-\u003emem) - section-\u003edata.size);\n\nReject section entries whose initial data is larger than the section size."
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              "value": "AV:L - The overflow is reached only when panthor_fw_load() parses mali_csffw.bin from the local firmware search path during platform probe (panthor_probe\u2192panthor_fw_init\u2192panthor_fw_load_section_entry\u2192panthor_fw_init_section_mem); no network, DRM ioctl, or /dev/dri/renderD* path feeds attacker-controlled firmware headers.\nAC:L - An attacker fully controls firmware section header fields (data.start/end versus va.start/end); once a malicious blob is in the firmware path, parsing deterministically performs an oversized memcpy and, with ZERO set, an underflowed memset on every load and on GPU-reset reloads without races or uncontrollable layout.\nPR:L - The parser performs no capability or authentication checks on firmware content; on Mali CSF Android, Chromebook, and embedded deployments the GPU firmware image commonly lives on vendor/firmware partitions writable by local non-root system or vendor service accounts, sufficient to plant the crafted blob before driver probe.\nUI:N - After the malicious firmware file is in place, parsing runs automatically at driver probe or GPU-reset section reload with no separate victim action; an attacker does not need another user to open a device node or mount a filesystem to trigger the bug.\nS:U - Impact is kernel heap corruption and potential local privilege escalation within the same kernel security domain; it does not cross a VM, IOMMU, or sandbox boundary such as guest-to-host escape.\nC:H - The unchecked memcpy copies attacker-controlled firmware bytes past the allocated shmem BO mapping, and the memset length underflow can zero far beyond the buffer, giving out-of-bounds read/write primitives over adjacent kernel heap objects rather than a bounded leak.\nI:H - Heap buffer overflow plus attacker-controlled firmware content enables arbitrary kernel memory corruption; the ZERO-flag memset underflow can perform a massive out-of-bounds zero write exploitable for control-flow hijacking and local privilege escalation.\nA:H - Oversized memcpy and underflowed memset corrupt kernel heap memory and can immediately kernel oops or panic; the same corruption is re-triggered on GPU reset via panthor_reload_fw_sections(), enabling repeatable denial of service."
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    "dateReserved": "2026-08-15T05:44:03.899Z",
    "dateUpdated": "2026-08-17T05:47:23.139Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T07:57:36+00:00",
      "cve": "CVE-2026-74452",
      "id": "CVE-2026-74452",
      "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: drm/panthor: reject firmware sections with oversized data",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74452.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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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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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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