FKIE_CVE-2026-64469
Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-27 05:16
Severity
Summary
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/android/binder.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "df1a17abba8d6fac5f965adcb8113ceace6e4949",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "38e1a71728e5795b670cc159c18e286a40aeebb4",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "faa070c7ad8ba25dcd0b12d7cdbb419e336f5391",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "e63032dc715026a96bcaa13d375a8e15c91caa84",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "ea02df466df60ecd758eb3b4df3f0cadc5c886ce",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "ef5439ba5b9ac93349f5df12ef88b42a0ce26340",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
},
{
"lessThan": "114a116aaa5f0295376cdf12da743c5bce3b20ce",
"status": "affected",
"version": "7a4408c6bd3eb1dafba67986259191be081e3efb",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/android/binder.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "4.14"
},
{
"lessThan": "4.14",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.96",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.39",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2-rc3",
"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_thread_release()\n\nWhen a thread exits, binder_thread_release() walks its transaction stack\nto clear the t-\u003efrom and t-\u003eto_proc that correspond with the exiting\nthread. However, a process dying in parallel might attempt to kfree some\nof these transactions. And if one of them has no associated t-\u003eto_proc,\nthe t-\u003eto_proc-\u003einner_lock will not be acquired.\n\nThis means that transaction accesses in binder_thread_release() after\nt-\u003eto_proc has been cleared might race with binder_free_transaction()\nand cause a use-after-free error as reported by KASAN:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in binder_thread_release+0x5d0/0x798\n Write of size 8 at addr ffff000016627500 by task X/715\n\n CPU: 17 UID: 0 PID: 715 Comm: X Not tainted 7.1.0-rc5-00149-g8fde5d1d47f6 #30 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n binder_thread_release+0x5d0/0x798\n binder_ioctl+0x12c0/0x299c\n [...]\n\n Allocated by task 717 on cpu 18 at 67.267803s:\n __kasan_kmalloc+0xa0/0xbc\n __kmalloc_cache_noprof+0x174/0x444\n binder_transaction+0x554/0x8150\n binder_thread_write+0xa30/0x4354\n binder_ioctl+0x20f0/0x299c\n [...]\n\n Freed by task 202 on cpu 18 at 90.416221s:\n __kasan_slab_free+0x58/0x80\n kfree+0x1a0/0x4a4\n binder_free_transaction+0x150/0x294\n binder_send_failed_reply+0x398/0x6d8\n binder_release_work+0x3e4/0x4ec\n binder_deferred_func+0xbd8/0x104c\n [...]\n ==================================================================\n\nIn order to avoid this, make sure that binder_free_transaction() reads\nthe t-\u003eto_proc under the transaction lock. This will serialize the\ntransaction release with the accesses in binder_thread_release(). Plus,\nit matches the documented locking rules for @to_proc."
}
],
"id": "CVE-2026-64469",
"lastModified": "2026-07-27T05:16:53.463",
"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": "2026-07-25T10:17:32.247",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/114a116aaa5f0295376cdf12da743c5bce3b20ce"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/38e1a71728e5795b670cc159c18e286a40aeebb4"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/df1a17abba8d6fac5f965adcb8113ceace6e4949"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/e63032dc715026a96bcaa13d375a8e15c91caa84"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ea02df466df60ecd758eb3b4df3f0cadc5c886ce"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/ef5439ba5b9ac93349f5df12ef88b42a0ce26340"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/faa070c7ad8ba25dcd0b12d7cdbb419e336f5391"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
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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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