CVE-2026-64467
Full vulnerability record from the local CVENow database.
Description
In 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!
View original CVE JSON
{
"id": "CVE-2026-64467",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-07-25T10:17:32.003",
"lastModified": "2026-11-03T18:15:39.353",
"vulnStatus": "Awaiting Analysis",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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's 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's 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's existing refcount guard refuses it and fires:\n\n rust_binder: Failure: refcount underflow!"
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/android/binder/allocation.rs"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "eafedbc7c050c44744fbdf80bdf3315e860b7513",
"lessThan": "89b8cc948dce661af87527623b3a41cdd115e2f9",
"versionType": "git",
"status": "affected"
},
{
"version": "eafedbc7c050c44744fbdf80bdf3315e860b7513",
"lessThan": "74920b1b4e474ba7a4de4323c0458deec49d210b",
"versionType": "git",
"status": "affected"
},
{
"version": "eafedbc7c050c44744fbdf80bdf3315e860b7513",
"lessThan": "803c8a9502e9b97cd6ae937618ef4a8fd6274343",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/android/binder/allocation.rs"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.18",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.18",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.39",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.1.4",
"lessThanOrEqual": "7.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {
"cvssMetricV31": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary",
"cvssData": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 2.0,
"impactScore": 6.0
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/74920b1b4e474ba7a4de4323c0458deec49d210b",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/803c8a9502e9b97cd6ae937618ef4a8fd6274343",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/89b8cc948dce661af87527623b3a41cdd115e2f9",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}