CVE-2025-39882 (GCVE-0-2025-39882)

Vulnerability from cvelistv5 – Published: 2025-09-23 06:00 – Updated: 2026-08-05 12:05
VLAI
Title
drm/mediatek: fix potential OF node use-after-free
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/mediatek: fix potential OF node use-after-free The for_each_child_of_node() helper drops the reference it takes to each node as it iterates over children and an explicit of_node_put() is only needed when exiting the loop early. Drop the recently introduced bogus additional reference count decrement at each iteration that could potentially lead to a use-after-free.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7d98166183d627c0b9daca7672b2191fae0f8a03 , < b2fbe0f9f80b9cfa1e06ddcf8b863d918394ef1d (git)
Affected: 31ce7c089b50c3d3056c37e0e25e7535e4428ae1 , < b58a26cdd4795c1ce6a80e38e9348885555dacd6 (git)
Affected: fae58d0155a979a8c414bbc12db09dd4b2f910d0 , < c4901802ed1ce859242e10af06e6a7752cba0497 (git)
Affected: 1f403699c40f0806a707a9a6eed3b8904224021a , < 4de37a48b6b58faaded9eb765047cf0d8785ea18 (git)
Create a notification for this product.
Linux Linux Affected: 6.6.105 , < 6.6.107 (semver)
Affected: 6.12.45 , < 6.12.48 (semver)
Affected: 6.16.5 , < 6.16.8 (semver)
Create a notification for this product.
Show details on NVD website
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On mt8195/mt8188 (`mmsys_dev_num == 2`) the loop runs at least twice per boot, and bind/unbind cycles reproduce it deterministically at will.\\nPR:N - No credential, capability, or namespace check exists anywhere on the path \\u2014 the references are dropped by the kernel\u0027s own component-bind machinery at boot, before any user session exists, so the underflowed/released `device_node` state is reached with zero privileges. Deliberate re-triggering via sysfs unbind would need root, but that is not required for the vulnerable condition to arise (same basis as CVE-2025-39930 for this identical bug class).\\nUI:N - The MediaTek DRM component master binds automatically once its device-tree components probe, and deferred-probe retries run unattended at boot; no administrator, victim action, mount, or file open is needed for the extra `of_node_put()` to fire.\\nS:U - The corrupted `struct device_node`, its embedded kobject, and the OF tree all belong to the kernel\u0027s own security authority, and the faulting code executes in that same kernel context. No hypervisor, IOMMU, or sandbox boundary is crossed.\\nC:H - This is a premature release/use-after-free of `device_node` objects that remain reachable through the OF tree, `dev-\u003eof_node`, and phandle lookups; `kobject_cleanup()` `kfree_const()`s `kobj-\u003ename` while leaving the pointer live, and once the slab is reclaimed `of_property_read_*()`, `%pOF` on `full_name`, and `kobject_name()` read back attacker-sprayed heap contents \\u2014 while the `bad of_node_put()` splat plus `dump_stack()` already leaks kernel pointers and a full stack trace.\\nI:H - A reclaimed `device_node` yields a control-flow hijack primitive via the embedded `fwnode_handle.ops` table dereferenced by `fwnode_call_int_op()` and via `kobj.ktype-\u003erelease` invoked on the next `of_node_put()`, and the `parent`/`child`/`sibling` links plus device-link `suppliers`/`consumers` list heads give arbitrary-write through list manipulation during tree operations.\\nA:H - Each boot produces \\\"ERROR: detected bad of_node_put()\\\" with `dump_stack()` followed by `refcount_t: underflow; use-after-free` WARNs \\u2014 an outright panic under `panic_on_warn` \\u2014 while `__kobject_del()` tears down `/sys/firmware/devicetree/base` entries and cascades puts onto the `/soc` node, and dereferencing a released node oopses the kernel with display bring-up failing outright.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7d98166183d627c0b9daca7672b2191fae0f8a03\", \"lessThan\": \"b2fbe0f9f80b9cfa1e06ddcf8b863d918394ef1d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"31ce7c089b50c3d3056c37e0e25e7535e4428ae1\", \"lessThan\": \"b58a26cdd4795c1ce6a80e38e9348885555dacd6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fae58d0155a979a8c414bbc12db09dd4b2f910d0\", \"lessThan\": \"c4901802ed1ce859242e10af06e6a7752cba0497\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1f403699c40f0806a707a9a6eed3b8904224021a\", \"lessThan\": \"4de37a48b6b58faaded9eb765047cf0d8785ea18\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/gpu/drm/mediatek/mtk_drm_drv.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6.105\", \"lessThan\": \"6.6.107\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.12.45\", \"lessThan\": \"6.12.48\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.16.5\", \"lessThan\": \"6.16.8\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/gpu/drm/mediatek/mtk_drm_drv.c\"], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/b2fbe0f9f80b9cfa1e06ddcf8b863d918394ef1d\"}, {\"url\": \"https://git.kernel.org/stable/c/b58a26cdd4795c1ce6a80e38e9348885555dacd6\"}, {\"url\": \"https://git.kernel.org/stable/c/c4901802ed1ce859242e10af06e6a7752cba0497\"}, {\"url\": \"https://git.kernel.org/stable/c/4de37a48b6b58faaded9eb765047cf0d8785ea18\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/mediatek: fix potential OF node use-after-free\\n\\nThe for_each_child_of_node() helper drops the reference it takes to each\\nnode as it iterates over children and an explicit of_node_put() is only\\nneeded when exiting the loop early.\\n\\nDrop the recently introduced bogus additional reference count decrement\\nat each iteration that could potentially lead to a use-after-free.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.107\", \"versionStartIncluding\": \"6.6.105\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.48\", \"versionStartIncluding\": \"6.12.45\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.16.8\", \"versionStartIncluding\": \"6.16.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:05:53.126Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-39882\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T12:05:53.126Z\", \"dateReserved\": \"2025-04-16T07:20:57.144Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-09-23T06:00:51.036Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.