CVE-2026-64468 (GCVE-0-2026-64468)
Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
EPSS
VEX
Title
binder: fix UAF in binder_free_transaction()
Summary
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.
Severity
7.8 (High)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
a370003cc301d4361bae20c9ef615f89bf8d1e8a , < 5602a43f251c3d75312df91a422675fc00ca3dce
(git)
Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < 0be901ab1dcc4af59b88f2e324493bb283850167 (git) Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < 48aeda9f8039e4a6971d1804578efde7f2c01eda (git) Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < 45df558c543bb5543bacc8065fd7c567740781e5 (git) Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < d45ef513eed1abebfec90c3cfb6ae50c2a4182db (git) Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < 328ccf32acb87e8bbb1fe2b065068c574e4db2bf (git) Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < 0f15f0f6ca5df566275ce517f257af2559528b41 (git) Affected: a370003cc301d4361bae20c9ef615f89bf8d1e8a , < f223d27a546c1e1f48d38fd67760e78f068fe8c4 (git) Affected: a4a3c070b8760f71c8311399fa9bfe67c8629bca (git) Affected: 22068d49d09d2b3890e19d7b2048a33340f992da (git) Affected: 0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9 (git) Affected: 4.14.136 , < 4.15 (semver) Affected: 4.19.64 , < 4.20 (semver) Affected: 5.1.15 , < 5.2 (semver) |
guessed | |
| Linux | Linux |
Affected:
5.2
Unaffected: 0 , < 5.2 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_free_transaction()\n\nIn binder_free_transaction(), the t-\u003eto_proc is read under the t-\u003elock.\nHowever, once the t-\u003elock is dropped, the to_proc can die in parallel.\nThis leads to a use-after-free error when we attempt to acquire its\ninner lock right afterwards:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x1a0\n Write of size 4 at addr ffff00001125da70 by task B/672\n\n CPU: 20 UID: 0 PID: 672 Comm: B Not tainted 7.1.0-rc6-00284-g8e65320d91cd #4 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n _raw_spin_lock+0xe4/0x1a0\n binder_free_transaction+0x8c/0x320\n binder_send_failed_reply+0x21c/0x2f8\n binder_thread_release+0x488/0x7e0\n binder_ioctl+0x12c0/0x29a0\n [...]\n\n Allocated by task 675:\n __kmalloc_cache_noprof+0x174/0x444\n binder_open+0x118/0xb70\n do_dentry_open+0x374/0x1040\n vfs_open+0x58/0x3bc\n [...]\n\n Freed by task 212:\n __kasan_slab_free+0x58/0x80\n kfree+0x1a0/0x4a4\n binder_proc_dec_tmpref+0x32c/0x5e0\n binder_deferred_func+0xc48/0x104c\n process_one_work+0x53c/0xbc0\n [...]\n ==================================================================\n\nTo prevent this, pin the target thread (t-\u003eto_thread) to guarantee the\ntarget process remains alive. Undelivered transactions without a target\nthread are already safe, as the target process can only be the current\ncontext in those paths."
}
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"metrics": [
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"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerability is reached through Binder device ioctls, including BINDER_WRITE_READ and BINDER_THREAD_EXIT, so the attacker requires local execution.\nAC:L - Attacker-controlled processes can construct the transaction stack and concurrently trigger both thread and target-process teardown, allowing repeated race attempts and heap spraying.\nPR:L - A basic unprivileged user can access an available Binder device or mount a private BinderFS instance through a user namespace; no capability in the initial user namespace is required.\nUI:N - All required transactions, thread exits, and process teardown can be performed by attacker-controlled processes without victim action.\nS:U - Exploitation affects the host kernel within its existing security authority, making this a standard local kernel privilege escalation with unchanged scope.\nC:H - The freed binder_proc can be reclaimed with attacker-influenced data, and subsequent stale-pointer dereferences can provide kernel-memory access and disclosure primitives.\nI:H - The UAF performs spinlock and counter writes into freed slab memory and may operate on a reclaimed waitqueue, enabling heap corruption and potential arbitrary kernel code execution.\nA:H - The demonstrated invalid spinlock write causes a KASAN UAF, and exploitation can otherwise produce a kernel crash, panic, or hang."
}
]
}
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"providerMetadata": {
"dateUpdated": "2026-08-17T04:56:13.826Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167"
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"url": "https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda"
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{
"url": "https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5"
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{
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{
"url": "https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf"
},
{
"url": "https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41"
},
{
"url": "https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4"
}
],
"title": "binder: fix UAF in binder_free_transaction()",
"x_generator": {
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"cveId": "CVE-2026-64468",
"datePublished": "2026-07-25T08:51:33.364Z",
"dateReserved": "2026-07-19T15:36:31.790Z",
"dateUpdated": "2026-08-17T04:56:13.826Z",
"state": "PUBLISHED"
},
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"dataVersion": "5.2",
"vulnerability-lookup:meta": {
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"cve": "CVE-2026-64468",
"date": "2026-09-23",
"epss": "0.00135",
"percentile": "0.03322"
},
"microsoft_vex": {
"current_release_date": "2026-07-27T14:43:39.000Z",
"cve": "CVE-2026-64468",
"id": "msrc_CVE-2026-64468",
"initial_release_date": "2026-07-26T01:12:42.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "binder: fix UAF in binder_free_transaction()",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64468.json",
"version": "2"
},
"nvd": {
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{
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"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_free_transaction()\n\nIn binder_free_transaction(), the t-\u003eto_proc is read under the t-\u003elock.\nHowever, once the t-\u003elock is dropped, the to_proc can die in parallel.\nThis leads to a use-after-free error when we attempt to acquire its\ninner lock right afterwards:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in _raw_spin_lock+0xe4/0x1a0\n Write of size 4 at addr ffff00001125da70 by task B/672\n\n CPU: 20 UID: 0 PID: 672 Comm: B Not tainted 7.1.0-rc6-00284-g8e65320d91cd #4 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n _raw_spin_lock+0xe4/0x1a0\n binder_free_transaction+0x8c/0x320\n binder_send_failed_reply+0x21c/0x2f8\n binder_thread_release+0x488/0x7e0\n binder_ioctl+0x12c0/0x29a0\n [...]\n\n Allocated by task 675:\n __kmalloc_cache_noprof+0x174/0x444\n binder_open+0x118/0xb70\n do_dentry_open+0x374/0x1040\n vfs_open+0x58/0x3bc\n [...]\n\n Freed by task 212:\n __kasan_slab_free+0x58/0x80\n kfree+0x1a0/0x4a4\n binder_proc_dec_tmpref+0x32c/0x5e0\n binder_deferred_func+0xc48/0x104c\n process_one_work+0x53c/0xbc0\n [...]\n ==================================================================\n\nTo prevent this, pin the target thread (t-\u003eto_thread) to guarantee the\ntarget process remains alive. Undelivered transactions without a target\nthread are already safe, as the target process can only be the current\ncontext in those paths."
}
],
"id": "CVE-2026-64468",
"lastModified": "2026-08-17T05:17:52.263",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-07-25T10:17:32.103",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5602a43f251c3d75312df91a422675fc00ca3dce"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T03:45:10+00:00",
"cve": "CVE-2026-64468",
"id": "CVE-2026-64468",
"initial_release_date": "2026-07-25T00:00:00+00:00",
"product_status:known_not_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: binder: fix UAF in binder_free_transaction()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64468.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-15T01:48:07Z",
"cve": "CVE-2026-64468",
"id": "CVE-2026-64468",
"initial_release_date": "2026-07-25T15:58:45Z",
"product_status:known_affected": "279",
"product_status:known_not_affected": "97",
"product_status:recommended": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-64468",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64468.json",
"version": "7"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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