CVE-2023-52679 (GCVE-0-2023-52679)

Vulnerability from cvelistv5 – Published: 2024-05-17 14:24 – Updated: 2026-08-05 09:11
VLAI
Title
of: Fix double free in of_parse_phandle_with_args_map
Summary
In the Linux kernel, the following vulnerability has been resolved: of: Fix double free in of_parse_phandle_with_args_map In of_parse_phandle_with_args_map() the inner loop that iterates through the map entries calls of_node_put(new) to free the reference acquired by the previous iteration of the inner loop. This assumes that the value of "new" is NULL on the first iteration of the inner loop. Make sure that this is true in all iterations of the outer loop by setting "new" to NULL after its value is assigned to "cur". Extend the unittest to detect the double free and add an additional test case that actually triggers this path.
Severity
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: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-20 14:12 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < 26b4d702c44f9e5cf3c5c001ae619a4a001889db (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < a0a061151a6200c13149dbcdb6c065203c8425d2 (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < d5f490343c77e6708b6c4aa7dbbfbcbb9546adea (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < 4541004084527ce9e95a818ebbc4e6b293ffca21 (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < b9d760dae5b10e73369b769073525acd7b3be2bd (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < b64d09a4e8596f76d27f4b4a90a1cf6baf6a82f8 (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < cafa992134124e785609a406da4ff2b54052aff7 (git)
Affected: bd6f2fd5a1d52198468c5cdc3c2472362dff5aaa , < 4dde83569832f9377362e50f7748463340c5db6b (git)
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Linux Linux Affected: 4.17
Unaffected: 0 , < 4.17 (semver)
Unaffected: 4.19.306 , ≤ 4.19.* (semver)
Unaffected: 5.4.268 , ≤ 5.4.* (semver)
Unaffected: 5.10.209 , ≤ 5.10.* (semver)
Unaffected: 5.15.148 , ≤ 5.15.* (semver)
Unaffected: 6.1.75 , ≤ 6.1.* (semver)
Unaffected: 6.6.14 , ≤ 6.6.* (semver)
Unaffected: 6.7.2 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                  "value": "AV:L - The only production caller is of_get_named_gpiod_flags() in gpiolib-of.c during local Device Tree GPIO phandle/nexus parsing; this is not reachable via network packets, adjacent-link protocols, or a physical bus endpoint.\nAC:L - On a system whose live DT contains a multi-level gpio-map nexus chain, a single GPIO lookup deterministically takes the buggy outer/inner-loop path and double-puts the intermediate node, with no race or other attacker-uncontrollable timing.\nPR:L - Under the higher-severity local interpretation, an unprivileged local user on an affected OF/OF_DYNAMIC system (e.g., embedded boards using gpio-map nexus/overlays) can benefit from the resulting of_node refcount corruption/UAF without needing init-namespace root or user-namespace capabilities.\nUI:N - No separate victim action is required; GPIO phandle parsing runs during driver/OF consumer lookup on the crafted or already-present nexus topology without the attacker needing another user to open a file or click anything.\nS:U - Impact is confined to host-kernel of_node lifetime and heap corruption within the same security authority; this is not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - The bug is a double of_node_put/refcount UAF on device_node objects, which per kernel CVSS guidance enables heap reuse and arbitrary kernel memory disclosure.\nI:H - Double-free/UAF of of_node heap objects can be leveraged via heap spraying for overlapping objects and control-flow hijacking, enabling arbitrary kernel write/code execution.\nA:H - The unbalanced of_node_put path causes refcount underflow, of_node_release errors, and kernel oops/panic even when not fully exploited for code execution."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:11:00.798Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/26b4d702c44f9e5cf3c5c001ae619a4a001889db"
            },
            {
              "url": "https://git.kernel.org/stable/c/a0a061151a6200c13149dbcdb6c065203c8425d2"
            },
            {
              "url": "https://git.kernel.org/stable/c/d5f490343c77e6708b6c4aa7dbbfbcbb9546adea"
            },
            {
              "url": "https://git.kernel.org/stable/c/4541004084527ce9e95a818ebbc4e6b293ffca21"
            },
            {
              "url": "https://git.kernel.org/stable/c/b9d760dae5b10e73369b769073525acd7b3be2bd"
            },
            {
              "url": "https://git.kernel.org/stable/c/b64d09a4e8596f76d27f4b4a90a1cf6baf6a82f8"
            },
            {
              "url": "https://git.kernel.org/stable/c/cafa992134124e785609a406da4ff2b54052aff7"
            },
            {
              "url": "https://git.kernel.org/stable/c/4dde83569832f9377362e50f7748463340c5db6b"
            }
          ],
          "title": "of: Fix double free in of_parse_phandle_with_args_map",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52679",
        "datePublished": "2024-05-17T14:24:43.380Z",
        "dateReserved": "2024-03-07T14:49:46.887Z",
        "dateUpdated": "2026-08-05T09:11:00.798Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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