binder: fix UAF in binder_thread_release()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64469
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:32 UTC
Updated2026-07-27 05:16:53 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001350000 probability, percentile 0.033620000 (date 2026-07-29)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb 1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082 git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb df1a17abba8d6fac5f965adcb8113ceace6e4949 git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb 38e1a71728e5795b670cc159c18e286a40aeebb4 git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb faa070c7ad8ba25dcd0b12d7cdbb419e336f5391 git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb e63032dc715026a96bcaa13d375a8e15c91caa84 git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb ea02df466df60ecd758eb3b4df3f0cadc5c886ce git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb ef5439ba5b9ac93349f5df12ef88b42a0ce26340 git Not specified
CNA Linux Linux affected 7a4408c6bd3eb1dafba67986259191be081e3efb 114a116aaa5f0295376cdf12da743c5bce3b20ce git Not specified
CNA Linux Linux affected 4.14 Not specified
CNA Linux Linux unaffected 4.14 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.96 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.39 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.4 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/38e1a71728e5795b670cc159c18e286a40aeebb4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/faa070c7ad8ba25dcd0b12d7cdbb419e336f5391 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ef5439ba5b9ac93349f5df12ef88b42a0ce26340 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/114a116aaa5f0295376cdf12da743c5bce3b20ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df1a17abba8d6fac5f965adcb8113ceace6e4949 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e63032dc715026a96bcaa13d375a8e15c91caa84 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ea02df466df60ecd758eb3b4df3f0cadc5c886ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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