GHSA-JCCH-XVF6-72QC
Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31In the Linux kernel, the following vulnerability has been resolved:
rust_binder: use a u64 stride when cleaning up the offsets array
Allocation's Drop walks the offsets array (binder_size_t = u64 entries), cleaning up the objects, but it used usize instead of u64 for both the stride and the per-entry read.
On 64-bit kernels (usize == u64) this is harmless, but on 32-bit kernels it walks the 8-byte entries in 4-byte steps, iterating an N-entry array 2N times, and reads the always-zero high word as offset 0, cleaning up the object at offset 0 N extra times. As a result the referenced node or handle ends up with a lower reference count than it actually has (a refcount over-decrement), and binder's reference accounting is corrupted; for example, the owner can be notified of a strong reference release (BR_RELEASE) even though references still remain.
Change the stride to u64, and read each entry as a u64, narrowing it to usize with try_into().
On 32-bit ARM, when this over-decrement would drive a count below zero, the driver's existing refcount guard refuses it and fires:
rust_binder: Failure: refcount underflow!
{
"affected": [],
"aliases": [
"CVE-2026-64467"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-25T10:17:32Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust_binder: use a u64 stride when cleaning up the offsets array\n\nAllocation\u0027s Drop walks the offsets array (binder_size_t = u64 entries),\ncleaning up the objects, but it used usize instead of u64 for both the\nstride and the per-entry read.\n\nOn 64-bit kernels (usize == u64) this is harmless, but on 32-bit kernels\nit walks the 8-byte entries in 4-byte steps, iterating an N-entry array\n2N times, and reads the always-zero high word as offset 0, cleaning up\nthe object at offset 0 N extra times. As a result the referenced node or\nhandle ends up with a lower reference count than it actually has (a\nrefcount over-decrement), and binder\u0027s reference accounting is corrupted;\nfor example, the owner can be notified of a strong reference release\n(BR_RELEASE) even though references still remain.\n\nChange the stride to u64, and read each entry as a u64, narrowing it to\nusize with try_into().\n\nOn 32-bit ARM, when this over-decrement would drive a count below zero,\nthe driver\u0027s existing refcount guard refuses it and fires:\n\n rust_binder: Failure: refcount underflow!",
"id": "GHSA-jcch-xvf6-72qc",
"modified": "2026-07-25T12:31:36Z",
"published": "2026-07-25T12:31:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64467"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/74920b1b4e474ba7a4de4323c0458deec49d210b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/803c8a9502e9b97cd6ae937618ef4a8fd6274343"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/89b8cc948dce661af87527623b3a41cdd115e2f9"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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