{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64469",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64469"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "binder: fix UAF in binder_thread_release()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_thread_release()\n\nWhen a thread exits, binder_thread_release() walks its transaction stack\nto clear the t->from and t->to_proc that correspond with the exiting\nthread. However, a process dying in parallel might attempt to kfree some\nof these transactions. And if one of them has no associated t->to_proc,\nthe t->to_proc->inner_lock will not be acquired.\n\nThis means that transaction accesses in binder_thread_release() after\nt->to_proc has been cleared might race with binder_free_transaction()\nand cause a use-after-free error as reported by KASAN:\n\n  ==================================================================\n  BUG: KASAN: slab-use-after-free in binder_thread_release+0x5d0/0x798\n  Write of size 8 at addr ffff000016627500 by task X/715\n\n  CPU: 17 UID: 0 PID: 715 Comm: X Not tainted 7.1.0-rc5-00149-g8fde5d1d47f6 #30 PREEMPT\n  Hardware name: linux,dummy-virt (DT)\n  Call trace:\n   binder_thread_release+0x5d0/0x798\n   binder_ioctl+0x12c0/0x299c\n   [...]\n\n  Allocated by task 717 on cpu 18 at 67.267803s:\n   __kasan_kmalloc+0xa0/0xbc\n   __kmalloc_cache_noprof+0x174/0x444\n   binder_transaction+0x554/0x8150\n   binder_thread_write+0xa30/0x4354\n   binder_ioctl+0x20f0/0x299c\n   [...]\n\n  Freed by task 202 on cpu 18 at 90.416221s:\n   __kasan_slab_free+0x58/0x80\n   kfree+0x1a0/0x4a4\n   binder_free_transaction+0x150/0x294\n   binder_send_failed_reply+0x398/0x6d8\n   binder_release_work+0x3e4/0x4ec\n   binder_deferred_func+0xbd8/0x104c\n   [...]\n  ==================================================================\n\nIn order to avoid this, make sure that binder_free_transaction() reads\nthe t->to_proc under the transaction lock. This will serialize the\ntransaction release with the accesses in binder_thread_release(). Plus,\nit matches the documented locking rules for @to_proc.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64469"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082"
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      "url": "https://git.kernel.org/stable/c/faa070c7ad8ba25dcd0b12d7cdbb419e336f5391"
    },
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      "url": "https://git.kernel.org/stable/c/e63032dc715026a96bcaa13d375a8e15c91caa84"
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      "url": "https://git.kernel.org/stable/c/ea02df466df60ecd758eb3b4df3f0cadc5c886ce"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation is reached through local Binder device ioctls, including BINDER_WRITE_READ and BINDER_THREAD_EXIT, rather than network input.\nAC:L - The attacker can control the communicating processes, nested synchronous transactions, thread exit, and concurrent target-process death, allowing repeated attempts at the race.\nPR:L - No capability check protects the vulnerable ioctls; ordinary Android applications can access Binder, and unprivileged user-namespace root can create private Binder devices through BinderFS.\nUI:N - The attacker directly creates the transaction stack and triggers both teardown paths without requiring any victim action.\nS:U - Exploitation compromises the kernel hosting the vulnerable Binder subsystem and constitutes standard local privilege escalation within the same security authority.\nC:H - The freed binder_transaction can be reclaimed with attacker-influenced contents, enabling kernel-memory access primitives and ultimately disclosure of arbitrary kernel or process memory.\nI:H - binder_thread_release() continues writing through the freed transaction, including pointer fields and the attacker-influenceable t->buffer path, permitting kernel-memory corruption and potential arbitrary write or code execution.\nA:H - The UAF can directly cause a kernel oops or panic and can be triggered repeatedly by an unprivileged local attacker."
    }
  }
}