binder: fix UAF in binder_free_transaction()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64468
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-25 10:17:32 UTC
Updated2026-07-27 05:16:52 UTC
DescriptionIn 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.

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 a370003cc301d4361bae20c9ef615f89bf8d1e8a 5602a43f251c3d75312df91a422675fc00ca3dce git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a 0be901ab1dcc4af59b88f2e324493bb283850167 git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a 48aeda9f8039e4a6971d1804578efde7f2c01eda git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a 45df558c543bb5543bacc8065fd7c567740781e5 git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a d45ef513eed1abebfec90c3cfb6ae50c2a4182db git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a 328ccf32acb87e8bbb1fe2b065068c574e4db2bf git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a 0f15f0f6ca5df566275ce517f257af2559528b41 git Not specified
CNA Linux Linux affected a370003cc301d4361bae20c9ef615f89bf8d1e8a f223d27a546c1e1f48d38fd67760e78f068fe8c4 git Not specified
CNA Linux Linux affected a4a3c070b8760f71c8311399fa9bfe67c8629bca git Not specified
CNA Linux Linux affected 22068d49d09d2b3890e19d7b2048a33340f992da git Not specified
CNA Linux Linux affected 0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9 git Not specified
CNA Linux Linux affected 4.14.136 4.15 semver Not specified
CNA Linux Linux affected 4.19.64 4.20 semver Not specified
CNA Linux Linux affected 5.1.15 5.2 semver Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 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/5602a43f251c3d75312df91a422675fc00ca3dce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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