CVE-2026-64468 - Vulnerability Details

- binder: fix UAF in binder_free_transaction()

Description

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.

Published: 2026-07-25

Score: 7.8 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Impact

A use‑after‑free flaw exists in the Linux kernel’s Binder subsystem. In binder_free_transaction, the target process is accessed after the lock protecting it is released, and the process may have terminated in that interval. The bug allows a kernel memory corruption that can cause a crash or other unintended behavior when the freed memory is accessed.

Affected Systems

The defect is present in any Linux kernel that bundles the Binder driver and has not applied the patch that adds a binding to the target thread before releasing the lock. No specific version range is supplied, so any current kernel release that includes binder and has not incorporated the reported fix should be assessed for vulnerability status.

Risk and Exploitability

The CVSS score of 7.8 indicates high severity. The EPSS score is reported as < 1 %, and the issue is not listed in CISA’s KEV catalog, implying that widespread exploitation is currently unlikely. Based on the description, it is inferred that a local attacker with the ability to inject Binder transactions could potentially trigger the bug, leading to kernel memory corruption and a system crash. The likelihood of exploitation remains low but should not be ignored for systems that use Binder or run in environments where local access is possible.

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

unaffected

Version	Status	Constraints
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< 5602a43f251c3d75312df91a422675fc00ca3dce
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< 0be901ab1dcc4af59b88f2e324493bb283850167
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< 48aeda9f8039e4a6971d1804578efde7f2c01eda
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< 45df558c543bb5543bacc8065fd7c567740781e5
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< d45ef513eed1abebfec90c3cfb6ae50c2a4182db
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< 328ccf32acb87e8bbb1fe2b065068c574e4db2bf
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< 0f15f0f6ca5df566275ce517f257af2559528b41
`a370003cc301d4361bae20c9ef615f89bf8d1e8a`	affected	< f223d27a546c1e1f48d38fd67760e78f068fe8c4
`a4a3c070b8760f71c8311399fa9bfe67c8629bca`	affected	—
`22068d49d09d2b3890e19d7b2048a33340f992da`	affected	—
`0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9`	affected	—
`4.14.136`	affected	< 4.15
`4.19.64`	affected	< 4.20
`5.1.15`	affected	< 5.2

Linux

affected

Version	Status	Constraints
`5.2`	affected	—
`0`	unaffected	< 5.2
`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	≤ *

No data.

Vendor Product Confidence Versions

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,5602a43f251c3d75312df91a422675fc00ca3dce)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,0be901ab1dcc4af59b88f2e324493bb283850167)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,48aeda9f8039e4a6971d1804578efde7f2c01eda)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,45df558c543bb5543bacc8065fd7c567740781e5)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,d45ef513eed1abebfec90c3cfb6ae50c2a4182db)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,328ccf32acb87e8bbb1fe2b065068c574e4db2bf)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,0f15f0f6ca5df566275ce517f257af2559528b41)`	affected	code_commit	—
`[a370003cc301d4361bae20c9ef615f89bf8d1e8a,f223d27a546c1e1f48d38fd67760e78f068fe8c4)`	affected	code_commit	—
`[a4a3c070b8760f71c8311399fa9bfe67c8629bca,a4a3c070b8760f71c8311399fa9bfe67c8629bca]`	affected	code_commit	—
`[22068d49d09d2b3890e19d7b2048a33340f992da,22068d49d09d2b3890e19d7b2048a33340f992da]`	affected	code_commit	—
`[0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9,0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9]`	affected	code_commit	—
`[4.14.136,4.15)`	affected	semver	—
`[4.19.64,4.20)`	affected	semver	—
`[5.1.15,5.2)`	affected	semver	—

Linux

Linux Kernel

99%

Version	Status	Scheme	Platform
`5.2`	affected	semver	—
`[0,5.2)`	unaffected	semver	—
`[5.10.261,5.11.0)`	unaffected	semver	—
`[5.15.212,5.16.0)`	unaffected	semver	—
`[6.1.178,6.2.0)`	unaffected	semver	—
`[6.6.145,6.7.0)`	unaffected	semver	—
`[6.12.96,6.13.0)`	unaffected	semver	—
`[6.18.39,6.19.0)`	unaffected	semver	—
`[7.1.4,*]`	unaffected	generic	—
`[7.2-rc3,*]`	unaffected	generic	—

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Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

Apply a kernel update that incorporates the binder_free_transaction UAF fix.
If Binder functionality is not required, disable the binder module or remove the Binder‑related kernel configuration.
Reboot the system after updating the kernel or disabling Binder to ensure the change takes effect.

Generated by OpenCVE AI on August 4, 2026 at 14:18 UTC.

Tracking

Sign in to view the affected projects.

Advisories

Source	ID	Title
Debian DLA	DLA-4717-1	linux security update
Debian DLA	DLA-4720-1	linux security update
Debian DLA	DLA-4723-1	linux-6.1 security update
Debian DLA	DLA-4724-1	linux-6.12 new package

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00135.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167
https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41
https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf
https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5
https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda
https://git.kernel.org/stable/c/5602a43f251c3d75312df91a422675fc00ca3dce
https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db
https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4
https://lore.kernel.org/linux-cve-announce/2026072545-CVE-2026-64468-1ee6@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2026-64468
https://www.cve.org/CVERecord?id=CVE-2026-64468

History

Sun, 02 Aug 2026 13:00:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-416

Thu, 30 Jul 2026 12:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-366
References		https://lore.kernel.org/linux-cve-announce/2026072545-CVE-2026-64468-1ee6@gregkh/T https://nvd.nist.gov/vuln/detail/CVE-2026-64468 https://www.cve.org/CVERecord?id=CVE-2026-64468
Metrics	threat_severity `None`	threat_severity `Moderate`

Mon, 27 Jul 2026 05:15:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}`

Sun, 26 Jul 2026 01:30:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-416

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_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.
Title		binder: fix UAF in binder_free_transaction()
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167 https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41 https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5 https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda https://git.kernel.org/stable/c/5602a43f251c3d75312df91a422675fc00ca3dce https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4

Subscriptions

Linux Linux Kernel

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2026-07-25T08:51:33.364Z

Updated: 2026-08-05T12:42:21.553Z

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

Link: CVE-2026-64468

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-07-25T10:17:32.103

Modified: 2026-07-27T05:16:52.920

Link: CVE-2026-64468

Redhat

Severity : Moderate

Publid Date: 2026-07-25T00:00:00Z

Links: CVE-2026-64468 - Bugzilla

OpenCVE Enrichment

Updated: 2026-08-04T14:30:10Z

Weaknesses

CWE-366
Race Condition within a Thread

Impact

Affected Systems

Risk and Exploitability

Tracking

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Subscriptions

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