CVE-2026-64468 (GCVE-0-2026-64468)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-08-17 04:56
VLAI
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)
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: 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)
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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)
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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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            "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:56:13.826Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5602a43f251c3d75312df91a422675fc00ca3dce"
        },
        {
          "url": "https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167"
        },
        {
          "url": "https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda"
        },
        {
          "url": "https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5"
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          "url": "https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db"
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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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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64468",
      "date": "2026-09-22",
      "epss": "0.00135",
      "percentile": "0.03324"
    },
    "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": {
      "cve": {
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                    "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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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.