CVE-2026-89825 (GCVE-0-2026-89825)
Vulnerability from cvelistv5
Published
2026-09-16 10:30
Modified
2026-10-19 08:53
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/panthor: fix firmware control interface bounds checks panthor_init_cs_iface() and panthor_init_csg_iface() validate firmware control interface offsets with 32-bit arithmetic and the size of the host wrapper structures. The offsets are derived from firmware-provided strides, so the arithmetic can wrap before the bounds check, and the host wrapper size is not the size of the firmware control interface being mapped. Use 64-bit arithmetic for the computed offsets and validate against the actual firmware control interface structure sizes with subtraction-based bounds checks. Also validate that the shared section is large enough for the global control interface before using it.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2718d91816eeed03c09c8abe872e45f59078768c
Version: 2718d91816eeed03c09c8abe872e45f59078768c
Version: 2718d91816eeed03c09c8abe872e45f59078768c
Version: 2718d91816eeed03c09c8abe872e45f59078768c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/panthor/panthor_fw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
            },
            {
              "lessThan": "80c9528661c774f899281c9a72011208ff39929e",
              "status": "affected",
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            },
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              "versionType": "git"
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              "status": "affected",
              "version": "2718d91816eeed03c09c8abe872e45f59078768c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/panthor/panthor_fw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panthor: fix firmware control interface bounds checks\n\npanthor_init_cs_iface() and panthor_init_csg_iface() validate firmware\ncontrol interface offsets with 32-bit arithmetic and the size of the host\nwrapper structures. The offsets are derived from firmware-provided strides,\nso the arithmetic can wrap before the bounds check, and the host wrapper\nsize is not the size of the firmware control interface being mapped.\n\nUse 64-bit arithmetic for the computed offsets and validate against the\nactual firmware control interface structure sizes with subtraction-based\nbounds checks. Also validate that the shared section is large enough for\nthe global control interface before using it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The 32-bit stride overflow is reached only on the local panthor probe path (panthor_probe \u2192 panthor_device_init \u2192 panthor_fw_init \u2192 panthor_fw_start \u2192 panthor_fw_init_ifaces \u2192 panthor_init_csg_iface/panthor_init_cs_iface) when mapping firmware-provided group_stride/stream_stride from mali_csffw.bin; no network, Bluetooth, or USB handler feeds those fields.\nAC:L - Firmware fully controls group_stride, stream_stride, and group_num (MIN_CSGS is 3, so csg_idx\u003e=1 always runs). A crafted stride that places the u32 offset near 2^32 makes offset+sizeof wrap to a small value and pass the bounds check deterministically, with no race or attacker-uncontrollable timing.\nPR:L - The parser applies no capability check to firmware contents. On Mali CSF Android phones, Chromebooks, and embedded boards, mali_csffw.bin commonly lives on vendor/firmware partitions writable by local non-root system or vendor service accounts, which is sufficient to plant the crafted blob before driver probe.\nUI:N - Once the crafted firmware is in place, panthor_fw_init_ifaces() runs automatically at driver probe and caches the resulting interface pointers; no separate victim action such as opening a file, mounting a filesystem, or using /dev/dri is required to trigger the overflow.\nS:U - The bug corrupts kernel memory past the firmware shared-section vmap and can enable local privilege escalation within the host kernel; it does not cross a VM, IOMMU, or sandbox boundary such as a KVM guest-to-host escape.\nC:H - A wrapped u32 iface_offset near 2^32 yields kmap plus a ~4GiB out-of-bounds control pointer; the kernel then reads panthor_fw_*_control_iface fields (input_va, output_va, stream_num, stream_stride, features) from that address, disclosing kernel memory rather than a few bounded bytes.\nI:H - Those OOB control pointers are cached for the device lifetime and consumed by scheduler, job-IRQ, and GROUP_CREATE paths that write panthor_fw_*_input_iface structures and allocate suspend buffers from control-\u003esuspend_size, enabling out-of-bounds kernel writes and control-flow hijacking.\nA:H - Dereferencing kmap plus a wrapped near-4GiB offset can immediately oops or panic if the region is unmapped, and a corrupted firmware interface leaves the Mali GPU unusable; the same path is hit on every probe or firmware boot until the blob is removed."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:19.123Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/33ae55809aee9b4dca1d00cdee35b527f2bf8626"
        },
        {
          "url": "https://git.kernel.org/stable/c/80c9528661c774f899281c9a72011208ff39929e"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e5c7cddc0073eef6f9bb373189b11a969f1f6f6"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a47f9fd2d970674ed9dedc52fc7ab76fd015785"
        }
      ],
      "title": "drm/panthor: fix firmware control interface bounds checks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89825",
    "datePublished": "2026-09-16T10:30:57.497Z",
    "dateReserved": "2026-09-11T19:38:34.768Z",
    "dateUpdated": "2026-10-19T08:53:19.123Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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