GHSA-3G5W-3HX7-Q6VH
Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-27 06:30In the Linux kernel, the following vulnerability has been resolved:
binder: fix UAF in binder_free_transaction()
In binder_free_transaction(), the t->to_proc is read under the t->lock. However, once the t->lock is dropped, the to_proc can die in parallel. This leads to a use-after-free error when we attempt to acquire its inner lock right afterwards:
================================================================== BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x1a0 Write of size 4 at addr ffff00001125da70 by task B/672
CPU: 20 UID: 0 PID: 672 Comm: B Not tainted 7.1.0-rc6-00284-g8e65320d91cd #4 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: _raw_spin_lock+0xe4/0x1a0 binder_free_transaction+0x8c/0x320 binder_send_failed_reply+0x21c/0x2f8 binder_thread_release+0x488/0x7e0 binder_ioctl+0x12c0/0x29a0 [...]
Allocated by task 675: __kmalloc_cache_noprof+0x174/0x444 binder_open+0x118/0xb70 do_dentry_open+0x374/0x1040 vfs_open+0x58/0x3bc [...]
Freed by task 212: __kasan_slab_free+0x58/0x80 kfree+0x1a0/0x4a4 binder_proc_dec_tmpref+0x32c/0x5e0 binder_deferred_func+0xc48/0x104c process_one_work+0x53c/0xbc0 [...] ==================================================================
To prevent this, pin the target thread (t->to_thread) to guarantee the target process remains alive. Undelivered transactions without a target thread are already safe, as the target process can only be the current context in those paths.
{
"affected": [],
"aliases": [
"CVE-2026-64468"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-25T10:17:32Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_free_transaction()\n\nIn binder_free_transaction(), the t-\u003eto_proc is read under the t-\u003elock.\nHowever, once the t-\u003elock is dropped, the to_proc can die in parallel.\nThis leads to a use-after-free error when we attempt to acquire its\ninner lock right afterwards:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x1a0\n Write of size 4 at addr ffff00001125da70 by task B/672\n\n CPU: 20 UID: 0 PID: 672 Comm: B Not tainted 7.1.0-rc6-00284-g8e65320d91cd #4 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n _raw_spin_lock+0xe4/0x1a0\n binder_free_transaction+0x8c/0x320\n binder_send_failed_reply+0x21c/0x2f8\n binder_thread_release+0x488/0x7e0\n binder_ioctl+0x12c0/0x29a0\n [...]\n\n Allocated by task 675:\n __kmalloc_cache_noprof+0x174/0x444\n binder_open+0x118/0xb70\n do_dentry_open+0x374/0x1040\n vfs_open+0x58/0x3bc\n [...]\n\n Freed by task 212:\n __kasan_slab_free+0x58/0x80\n kfree+0x1a0/0x4a4\n binder_proc_dec_tmpref+0x32c/0x5e0\n binder_deferred_func+0xc48/0x104c\n process_one_work+0x53c/0xbc0\n [...]\n ==================================================================\n\nTo prevent this, pin the target thread (t-\u003eto_thread) to guarantee the\ntarget process remains alive. Undelivered transactions without a target\nthread are already safe, as the target process can only be the current\ncontext in those paths.",
"id": "GHSA-3g5w-3hx7-q6vh",
"modified": "2026-07-27T06:30:39Z",
"published": "2026-07-25T12:31:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64468"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/5602a43f251c3d75312df91a422675fc00ca3dce"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
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