CVE-2025-40028 (GCVE-0-2025-40028)
Vulnerability from cvelistv5 – Published: 2025-10-28 09:32 – Updated: 2025-12-01 06:16
VLAI?
Title
binder: fix double-free in dbitmap
Summary
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 ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
15d9da3f818cae676f822a04407d3c17b53357d2 , < c301ec61ce6f16e21a36b99225ca8a20c1591e10
(git)
Affected: 15d9da3f818cae676f822a04407d3c17b53357d2 , < 0390633979969c54c0ce6a198d6f45cdbe2c84b1 (git) Affected: 15d9da3f818cae676f822a04407d3c17b53357d2 , < b781e5635a3398e2b64440371233c2c5102cd6cb (git) Affected: 15d9da3f818cae676f822a04407d3c17b53357d2 , < 3ebcd3460cad351f198c39c6edb4af519a0ed934 (git) |
||
{
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{
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"product": "Linux",
"programFiles": [
"drivers/android/dbitmap.h"
],
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"vendor": "Linux",
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"status": "affected",
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"versionType": "git"
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{
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"status": "affected",
"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
"versionType": "git"
},
{
"lessThan": "3ebcd3460cad351f198c39c6edb4af519a0ed934",
"status": "affected",
"version": "15d9da3f818cae676f822a04407d3c17b53357d2",
"versionType": "git"
}
]
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{
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"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "6.11"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"cpeMatch": [
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"versionEndExcluding": "6.12.52",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.12",
"versionStartIncluding": "6.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003edmap. 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-\u003emap NULL in dbitmap_free()."
}
],
"providerMetadata": {
"dateUpdated": "2025-12-01T06:16:30.652Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/c301ec61ce6f16e21a36b99225ca8a20c1591e10"
},
{
"url": "https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1"
},
{
"url": "https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb"
},
{
"url": "https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934"
}
],
"title": "binder: fix double-free in dbitmap",
"x_generator": {
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}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40028",
"datePublished": "2025-10-28T09:32:35.681Z",
"dateReserved": "2025-04-16T07:20:57.152Z",
"dateUpdated": "2025-12-01T06:16:30.652Z",
"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 observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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