In the Linux kernel, the following vulnerability has been resolved:

binder: fix UAF in binder_thread_release()

When a thread exits, binder_thread_release() walks its transaction stack
to clear the t->from and t->to_proc that correspond with the exiting
thread. However, a process dying in parallel might attempt to kfree some
of these transactions. And if one of them has no associated t->to_proc,
the t->to_proc->inner_lock will not be acquired.

This means that transaction accesses in binder_thread_release() after
t->to_proc has been cleared might race with binder_free_transaction()
and cause a use-after-free error as reported by KASAN:

==================================================================
BUG: KASAN: slab-use-after-free in binder_thread_release+0x5d0/0x798
Write of size 8 at addr ffff000016627500 by task X/715

CPU: 17 UID: 0 PID: 715 Comm: X Not tainted 7.1.0-rc5-00149-g8fde5d1d47f6 #30 PREEMPT
Hardware name: linux,dummy-virt (DT)
Call trace:
binder_thread_release+0x5d0/0x798
binder_ioctl+0x12c0/0x299c
[...]

Allocated by task 717 on cpu 18 at 67.267803s:
__kasan_kmalloc+0xa0/0xbc
__kmalloc_cache_noprof+0x174/0x444
binder_transaction+0x554/0x8150
binder_thread_write+0xa30/0x4354
binder_ioctl+0x20f0/0x299c
[...]

Freed by task 202 on cpu 18 at 90.416221s:
__kasan_slab_free+0x58/0x80
kfree+0x1a0/0x4a4
binder_free_transaction+0x150/0x294
binder_send_failed_reply+0x398/0x6d8
binder_release_work+0x3e4/0x4ec
binder_deferred_func+0xbd8/0x104c
[...]
==================================================================

In order to avoid this, make sure that binder_free_transaction() reads
the t->to_proc under the transaction lock. This will serialize the
transaction release with the accesses in binder_thread_release(). Plus,
it matches the documented locking rules for @to_proc.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
7a4408c6bd3eb1dafba67986259191be081e3efb affected < 1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082
7a4408c6bd3eb1dafba67986259191be081e3efb affected < df1a17abba8d6fac5f965adcb8113ceace6e4949
7a4408c6bd3eb1dafba67986259191be081e3efb affected < 38e1a71728e5795b670cc159c18e286a40aeebb4
7a4408c6bd3eb1dafba67986259191be081e3efb affected < faa070c7ad8ba25dcd0b12d7cdbb419e336f5391
7a4408c6bd3eb1dafba67986259191be081e3efb affected < e63032dc715026a96bcaa13d375a8e15c91caa84
7a4408c6bd3eb1dafba67986259191be081e3efb affected < ea02df466df60ecd758eb3b4df3f0cadc5c886ce
7a4408c6bd3eb1dafba67986259191be081e3efb affected < ef5439ba5b9ac93349f5df12ef88b42a0ce26340
7a4408c6bd3eb1dafba67986259191be081e3efb affected < 114a116aaa5f0295376cdf12da743c5bce3b20ce
Linux Linux affected
Version Status Constraints
4.14 affected —
0 unaffected < 4.14
5.10.261 unaffected ≤ 5.10.*
5.15.212 unaffected ≤ 5.15.*
6.1.178 unaffected ≤ 6.1.*
6.6.145 unaffected ≤ 6.6.*
6.12.96 unaffected ≤ 6.12.*
6.18.39 unaffected ≤ 6.18.*
7.1.4 unaffected ≤ 7.1.*
7.2-rc3 unaffected ≤ *

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References
Link Providers
https://git.kernel.org/stable/c/114a116aaa5f0295376cdf12da743c5bce3b20ce cve-icon
https://git.kernel.org/stable/c/1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082 cve-icon
https://git.kernel.org/stable/c/38e1a71728e5795b670cc159c18e286a40aeebb4 cve-icon
https://git.kernel.org/stable/c/df1a17abba8d6fac5f965adcb8113ceace6e4949 cve-icon
https://git.kernel.org/stable/c/e63032dc715026a96bcaa13d375a8e15c91caa84 cve-icon
https://git.kernel.org/stable/c/ea02df466df60ecd758eb3b4df3f0cadc5c886ce cve-icon
https://git.kernel.org/stable/c/ef5439ba5b9ac93349f5df12ef88b42a0ce26340 cve-icon
https://git.kernel.org/stable/c/faa070c7ad8ba25dcd0b12d7cdbb419e336f5391 cve-icon
History

Sat, 25 Jul 2026 09:30:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: binder: fix UAF in binder_thread_release() When a thread exits, binder_thread_release() walks its transaction stack to clear the t->from and t->to_proc that correspond with the exiting thread. However, a process dying in parallel might attempt to kfree some of these transactions. And if one of them has no associated t->to_proc, the t->to_proc->inner_lock will not be acquired. This means that transaction accesses in binder_thread_release() after t->to_proc has been cleared might race with binder_free_transaction() and cause a use-after-free error as reported by KASAN: ================================================================== BUG: KASAN: slab-use-after-free in binder_thread_release+0x5d0/0x798 Write of size 8 at addr ffff000016627500 by task X/715 CPU: 17 UID: 0 PID: 715 Comm: X Not tainted 7.1.0-rc5-00149-g8fde5d1d47f6 #30 PREEMPT Hardware name: linux,dummy-virt (DT) Call trace: binder_thread_release+0x5d0/0x798 binder_ioctl+0x12c0/0x299c [...] Allocated by task 717 on cpu 18 at 67.267803s: __kasan_kmalloc+0xa0/0xbc __kmalloc_cache_noprof+0x174/0x444 binder_transaction+0x554/0x8150 binder_thread_write+0xa30/0x4354 binder_ioctl+0x20f0/0x299c [...] Freed by task 202 on cpu 18 at 90.416221s: __kasan_slab_free+0x58/0x80 kfree+0x1a0/0x4a4 binder_free_transaction+0x150/0x294 binder_send_failed_reply+0x398/0x6d8 binder_release_work+0x3e4/0x4ec binder_deferred_func+0xbd8/0x104c [...] ================================================================== In order to avoid this, make sure that binder_free_transaction() reads the t->to_proc under the transaction lock. This will serialize the transaction release with the accesses in binder_thread_release(). Plus, it matches the documented locking rules for @to_proc.
Title binder: fix UAF in binder_thread_release()
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-07-25T08:51:34.025Z

Reserved: 2026-07-19T15:36:31.790Z

Link: CVE-2026-64469

cve-icon Vulnrichment

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cve-icon Redhat

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