CVE-2026-64469 (GCVE-0-2026-64469)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
Title
binder: fix UAF in binder_thread_release()
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < 1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082 (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < df1a17abba8d6fac5f965adcb8113ceace6e4949 (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < 38e1a71728e5795b670cc159c18e286a40aeebb4 (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < faa070c7ad8ba25dcd0b12d7cdbb419e336f5391 (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < e63032dc715026a96bcaa13d375a8e15c91caa84 (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < ea02df466df60ecd758eb3b4df3f0cadc5c886ce (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < ef5439ba5b9ac93349f5df12ef88b42a0ce26340 (git)
Affected: 7a4408c6bd3eb1dafba67986259191be081e3efb , < 114a116aaa5f0295376cdf12da743c5bce3b20ce (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (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)
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{
  "containers": {
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          "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."
        }
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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"
          },
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            {
              "lang": "en",
              "value": "AV:L - Exploitation is reached through local Binder device ioctls, including BINDER_WRITE_READ and BINDER_THREAD_EXIT, rather than network input.\nAC:L - The attacker can control the communicating processes, nested synchronous transactions, thread exit, and concurrent target-process death, allowing repeated attempts at the race.\nPR:L - No capability check protects the vulnerable ioctls; ordinary Android applications can access Binder, and unprivileged user-namespace root can create private Binder devices through BinderFS.\nUI:N - The attacker directly creates the transaction stack and triggers both teardown paths without requiring any victim action.\nS:U - Exploitation compromises the kernel hosting the vulnerable Binder subsystem and constitutes standard local privilege escalation within the same security authority.\nC:H - The freed binder_transaction can be reclaimed with attacker-influenced contents, enabling kernel-memory access primitives and ultimately disclosure of arbitrary kernel or process memory.\nI:H - binder_thread_release() continues writing through the freed transaction, including pointer fields and the attacker-influenceable t-\u003ebuffer path, permitting kernel-memory corruption and potential arbitrary write or code execution.\nA:H - The UAF can directly cause a kernel oops or panic and can be triggered repeatedly by an unprivileged local attacker."
            }
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        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
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      ],
      "title": "binder: fix UAF in binder_thread_release()",
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      }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64469",
    "datePublished": "2026-07-25T08:51:34.025Z",
    "dateReserved": "2026-07-19T15:36:31.790Z",
    "dateUpdated": "2026-08-17T04:56:14.927Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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      "cve": "CVE-2026-64469",
      "date": "2026-09-22",
      "epss": "0.00135",
      "percentile": "0.03323"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-27T14:48:11.000Z",
      "cve": "CVE-2026-64469",
      "id": "msrc_CVE-2026-64469",
      "initial_release_date": "2026-07-26T01:05:58.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "binder: fix UAF in binder_thread_release()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64469.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "affected": [
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        "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": "2026-08-17T05:17:52.430",
        "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T06:05:11+00:00",
      "cve": "CVE-2026-64469",
      "id": "CVE-2026-64469",
      "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_thread_release()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64469.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T01:48:05Z",
      "cve": "CVE-2026-64469",
      "id": "CVE-2026-64469",
      "initial_release_date": "2026-07-25T15:58:44Z",
      "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-2026-64469",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64469.json",
      "version": "7"
    }
  }
}



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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.



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.