CVE-2025-40028
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: binder: fix double-free in dbitmap A process might fail to allocate a new bitmap when trying to expand its proc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap via dbitmap_free(). However, the driver calls dbitmap_free() again when the same process terminates, leading to a double-free error: ================================================================== BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c Free of addr ffff00000b7c1420 by task kworker/9:1/209 CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: events binder_deferred_func Call trace: kfree+0x164/0x31c binder_proc_dec_tmpref+0x2e0/0x55c binder_deferred_func+0xc24/0x1120 process_one_work+0x520/0xba4 [...] Allocated by task 448: __kmalloc_noprof+0x178/0x3c0 bitmap_zalloc+0x24/0x30 binder_open+0x14c/0xc10 [...] Freed by task 449: kfree+0x184/0x31c binder_inc_ref_for_node+0xb44/0xe44 binder_transaction+0x29b4/0x7fbc binder_thread_write+0x1708/0x442c binder_ioctl+0x1b50/0x2900 [...] ================================================================== Fix this issue by marking proc->map NULL in dbitmap_free().
Severity
HIGH
CVSS score
7.8
(v3.1)
Vulnerability status
Deferred
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-10-28 10:15:42.447000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON
{
"id": "CVE-2025-40028",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2025-10-28T10:15:42.447",
"lastModified": "2026-10-19T21:10:00.160",
"vulnStatus": "Deferred",
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix double-free in dbitmap\n\nA process might fail to allocate a new bitmap when trying to expand its\nproc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap\nvia dbitmap_free(). However, the driver calls dbitmap_free() again when\nthe same process terminates, leading to a double-free error:\n\n ==================================================================\n BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c\n Free of addr ffff00000b7c1420 by task kworker/9:1/209\n\n CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Workqueue: events binder_deferred_func\n Call trace:\n kfree+0x164/0x31c\n binder_proc_dec_tmpref+0x2e0/0x55c\n binder_deferred_func+0xc24/0x1120\n process_one_work+0x520/0xba4\n [...]\n\n Allocated by task 448:\n __kmalloc_noprof+0x178/0x3c0\n bitmap_zalloc+0x24/0x30\n binder_open+0x14c/0xc10\n [...]\n\n Freed by task 449:\n kfree+0x184/0x31c\n binder_inc_ref_for_node+0xb44/0xe44\n binder_transaction+0x29b4/0x7fbc\n binder_thread_write+0x1708/0x442c\n binder_ioctl+0x1b50/0x2900\n [...]\n ==================================================================\n\nFix this issue by marking proc->map NULL in dbitmap_free()."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nbinder: corrección de doble liberación en dbitmap\n\nUn proceso podría fallar al asignar un nuevo bitmap al intentar expandir su proc->dmap. En ese caso, dbitmap_grow() falla y libera el bitmap antiguo a través de dbitmap_free(). Sin embargo, el controlador llama a dbitmap_free() de nuevo cuando el mismo proceso termina, lo que lleva a un error de doble liberación:\n\n ==================================================================\n BUG: KASAN: doble liberación en binder_proc_dec_tmpref+0x2e0/0x55c\n Liberación de dirección ffff00000b7c1420 por tarea kworker/9:1/209\n\n CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Workqueue: events binder_deferred_func\n Rastreo de llamadas:\n kfree+0x164/0x31c\n binder_proc_dec_tmpref+0x2e0/0x55c\n binder_deferred_func+0xc24/0x1120\n process_one_work+0x520/0xba4\n [...]\n\n Asignado por tarea 448:\n __kmalloc_noprof+0x178/0x3c0\n bitmap_zalloc+0x24/0x30\n binder_open+0x14c/0xc10\n [...]\n\n Liberado por tarea 449:\n kfree+0x184/0x31c\n binder_inc_ref_for_node+0xb44/0xe44\n binder_transaction+0x29b4/0x7fbc\n binder_thread_write+0x1708/0x442c\n binder_ioctl+0x1b50/0x2900\n [...]\n ==================================================================\n\nSolucione este problema marcando proc->map como NULL en dbitmap_free()."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/android/dbitmap.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
"lessThan": "c301ec61ce6f16e21a36b99225ca8a20c1591e10",
"versionType": "git",
"status": "affected"
},
{
"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
"lessThan": "0390633979969c54c0ce6a198d6f45cdbe2c84b1",
"versionType": "git",
"status": "affected"
},
{
"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
"lessThan": "b781e5635a3398e2b64440371233c2c5102cd6cb",
"versionType": "git",
"status": "affected"
},
{
"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
"lessThan": "3ebcd3460cad351f198c39c6edb4af519a0ed934",
"versionType": "git",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/android/dbitmap.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.11",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.11",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.52",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.16.12",
"lessThanOrEqual": "6.16.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.17.2",
"lessThanOrEqual": "6.17.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18",
"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:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"attackVector": "LOCAL",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"availabilityImpact": "HIGH"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9
}
]
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c301ec61ce6f16e21a36b99225ca8a20c1591e10",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
]
}