{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74519",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74519"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "pinctrl: devicetree: don't free uninitialized dev_name on error path",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npinctrl: devicetree: don't free uninitialized dev_name on error path\n\ndt_remember_or_free_map() duplicates dev_name for each map entry. If\nkstrdup_const() fails, dt_free_map() frees dev_name in all num_maps\nentries, including entries that have not been initialized.\n\nSome pinctrl drivers, including pinctrl-imx, allocate the map with\nkmalloc() and leave dev_name for the core to initialize. The untouched\nentries therefore contain uninitialized data which is passed to\nkfree_const().\n\nReproduced on qemu's mcimx6ul-evk (pinctrl-imx) with failslab injection\nwhile binding the pinctrl-consuming device, under KASAN:\n\n  BUG: KASAN: double-free in dt_free_map+0x34/0xa4\n  Free of addr c425a900 by task init/1\n   kfree from dt_free_map+0x34/0xa4\n   dt_free_map from dt_remember_or_free_map+0x184/0x198\n   dt_remember_or_free_map from pinctrl_dt_to_map+0x33c/0x4c8\n   pinctrl_dt_to_map from create_pinctrl+0x9c/0x5c0\n\nInitialize all dev_name fields to NULL before duplicating the device\nname, making the full-map cleanup safe after a partial failure.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.12.103"
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          "1:6.18.29-1+rpt1": {
            "linux_commit": "66318c5b5cd8145a662303af12ed39ac07eb27cc",
            "upstream_version": "6.18.29",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
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          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
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          "1:6.18.39-1+rpt1": {
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            "assessment": "commit ancestry (strak rule)",
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    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74519"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e3cfb22bad363bebcfd55d909e12d499cb8c5490"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1586423da2739a80871ef6240016fcb9c7339bfb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dec5f0a8080502908dec5e35597c7ae07d533a3b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/929f6396baade89999ec8a1281232c101cbc727d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/321fe3584a8298386938130d138191aa35040b75"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ad0ad3c228b6f76fde10f32047e0ec5fbc109dc8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9d00a5ac7cd3d32ae61140f4b8a62f136de84e7d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/015b5bcbcb622b32317642be91a7f79aa5413649"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-19T16:47:12Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached only through local device driver probe/binding (really_probe -> pinctrl_bind_pins -> devm_pinctrl_get -> create_pinctrl -> pinctrl_dt_to_map -> dt_remember_or_free_map); no network, Bluetooth, or remote protocol handler is on this path.\nAC:L - Once a pinctrl-consuming imx/sunxi device probes or re-probes, an attacker can reliably force kstrdup_const() to fail with sustained memory pressure; the partial-init error path then deterministically calls dt_free_map() on all entries, as confirmed by failslab/KASAN reproduction.\nPR:L - A local unprivileged account suffices to exhaust kernel memory during probe or deferred-probe retry; no CAP_SYS_ADMIN, module load, or DT overlay is strictly required beyond having affected OF hardware that binds pinctrl at boot or on automatic reprobe.\nUI:N - Exploitation executes autonomously during kernel driver initialization when allocation fails; no victim mount, file open, or other interactive action is needed.\nS:U - Double-free and heap corruption remain within kernel slab memory in the same security authority; this is a standard local kernel compromise path without VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - kfree_const() on uninitialized kmalloc map[i].dev_name values causes invalid or duplicate frees; KASAN reports double-free, and corrupted freelist/overlapping slab objects can be groomed into arbitrary kernel memory disclosure.\nI:H - Double-free and invalid kfree corrupt the SLUB freelist; attacker-controlled heap grooming can yield overlapping allocations and write primitives enabling control-flow hijack and arbitrary kernel code execution.\nA:H - KASAN-confirmed double-free in dt_free_map during device bind causes kernel oops/panic; even without full exploitation the invalid kmem_cache_free reliably crashes the system on affected embedded imx/sunxi platforms."
    }
  }
}