CVE-2026-74519 (GCVE-0-2026-74519)
Vulnerability from cvelistv5
Published
2026-08-15 12:27
Modified
2026-08-19 16:38
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
pinctrl: devicetree: don't free uninitialized dev_name on error path
dt_remember_or_free_map() duplicates dev_name for each map entry. If
kstrdup_const() fails, dt_free_map() frees dev_name in all num_maps
entries, including entries that have not been initialized.
Some pinctrl drivers, including pinctrl-imx, allocate the map with
kmalloc() and leave dev_name for the core to initialize. The untouched
entries therefore contain uninitialized data which is passed to
kfree_const().
Reproduced on qemu's mcimx6ul-evk (pinctrl-imx) with failslab injection
while binding the pinctrl-consuming device, under KASAN:
BUG: KASAN: double-free in dt_free_map+0x34/0xa4
Free of addr c425a900 by task init/1
kfree from dt_free_map+0x34/0xa4
dt_free_map from dt_remember_or_free_map+0x184/0x198
dt_remember_or_free_map from pinctrl_dt_to_map+0x33c/0x4c8
pinctrl_dt_to_map from create_pinctrl+0x9c/0x5c0
Initialize all dev_name fields to NULL before duplicating the device
name, making the full-map cleanup safe after a partial failure.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: be4c60b563edee3712d392aaeb0943a768df7023 Version: 03f69244302d7954f42f528ea2d45903ebbf59f3 Version: 77440c3a37203e3f4667d06e37f76ef3968d2d8c Version: 679c4f27b8958b65bb51d1c3dfdbf3befe4a33a3 Version: f88ac1330779c5bfdd79f7d7f7d4d3343c782f92 Version: f739a699db7d5a5cf39ca3ce2c84e4fe4a8f4c5d Version: 4.4.244 ≤ Version: 4.9.244 ≤ Version: 4.14.161 ≤ Version: 4.19.92 ≤ Version: 5.4.7 ≤ |
||
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\npinctrl: devicetree: don\u0027t 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\u0027s 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."
}
],
"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 bug is reached only through local device driver probe/binding (really_probe -\u003e pinctrl_bind_pins -\u003e devm_pinctrl_get -\u003e create_pinctrl -\u003e pinctrl_dt_to_map -\u003e 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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:38:21.855Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/e3cfb22bad363bebcfd55d909e12d499cb8c5490"
},
{
"url": "https://git.kernel.org/stable/c/1586423da2739a80871ef6240016fcb9c7339bfb"
},
{
"url": "https://git.kernel.org/stable/c/dec5f0a8080502908dec5e35597c7ae07d533a3b"
},
{
"url": "https://git.kernel.org/stable/c/929f6396baade89999ec8a1281232c101cbc727d"
},
{
"url": "https://git.kernel.org/stable/c/321fe3584a8298386938130d138191aa35040b75"
},
{
"url": "https://git.kernel.org/stable/c/ad0ad3c228b6f76fde10f32047e0ec5fbc109dc8"
},
{
"url": "https://git.kernel.org/stable/c/9d00a5ac7cd3d32ae61140f4b8a62f136de84e7d"
},
{
"url": "https://git.kernel.org/stable/c/015b5bcbcb622b32317642be91a7f79aa5413649"
}
],
"title": "pinctrl: devicetree: don\u0027t free uninitialized dev_name on error path",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-74519",
"datePublished": "2026-08-15T12:27:38.101Z",
"dateReserved": "2026-08-15T05:44:03.910Z",
"dateUpdated": "2026-08-19T16:38:21.855Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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