ghsa-8vjm-fc8f-c7jh
Vulnerability from github
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().
{
"affected": [],
"aliases": [
"CVE-2025-40028"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-28T10:15:42Z",
"severity": null
},
"details": "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().",
"id": "GHSA-8vjm-fc8f-c7jh",
"modified": "2025-10-28T12:30:14Z",
"published": "2025-10-28T12:30:14Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40028"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0390633979969c54c0ce6a198d6f45cdbe2c84b1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3ebcd3460cad351f198c39c6edb4af519a0ed934"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b781e5635a3398e2b64440371233c2c5102cd6cb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c301ec61ce6f16e21a36b99225ca8a20c1591e10"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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