CVE-2026-64468
In 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.
CSIRTS triage
- What
- There is a use-after-free vulnerability in binder_free_transaction().
- Who is affected
- Deployments using the binder IPC mechanism.
- Urgency
- Remediation is necessary to prevent potential crashes.
- Action
- Apply the relevant patches once available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Advisory coverage (2)
- highCVE-2026-64468: In the Linux kernel, the following vulnerability has been resolved: binder: fix UAF in binder_…nvd · 2026-07-25
- mediumCVE-2026-64468: binder: fix UAF in binder_free_transaction()msrc · 2026-07-14
External references
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