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

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
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
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
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)
Create a notification for this product.
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-rc3 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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                  "versionEndExcluding": "7.2-rc3",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:34.025Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082"
        },
        {
          "url": "https://git.kernel.org/stable/c/df1a17abba8d6fac5f965adcb8113ceace6e4949"
        },
        {
          "url": "https://git.kernel.org/stable/c/38e1a71728e5795b670cc159c18e286a40aeebb4"
        },
        {
          "url": "https://git.kernel.org/stable/c/faa070c7ad8ba25dcd0b12d7cdbb419e336f5391"
        },
        {
          "url": "https://git.kernel.org/stable/c/e63032dc715026a96bcaa13d375a8e15c91caa84"
        },
        {
          "url": "https://git.kernel.org/stable/c/ea02df466df60ecd758eb3b4df3f0cadc5c886ce"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef5439ba5b9ac93349f5df12ef88b42a0ce26340"
        },
        {
          "url": "https://git.kernel.org/stable/c/114a116aaa5f0295376cdf12da743c5bce3b20ce"
        }
      ],
      "title": "binder: fix UAF in binder_thread_release()",
      "x_generator": {
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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": "2026-07-25T08:51:34.025Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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    "epss": {
      "cve": "CVE-2026-64469",
      "date": "2026-07-25",
      "epss": "0.0022",
      "percentile": "0.1259"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64469\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:32.247\",\"lastModified\":\"2026-07-25T10:17:32.247\",\"vulnStatus\":\"Received\",\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/android/binder.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"1f96f8c0a6ed4f6d01d3dd29ad0cbf08dde96082\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"df1a17abba8d6fac5f965adcb8113ceace6e4949\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"38e1a71728e5795b670cc159c18e286a40aeebb4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"faa070c7ad8ba25dcd0b12d7cdbb419e336f5391\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"e63032dc715026a96bcaa13d375a8e15c91caa84\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"ea02df466df60ecd758eb3b4df3f0cadc5c886ce\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"ef5439ba5b9ac93349f5df12ef88b42a0ce26340\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a4408c6bd3eb1dafba67986259191be081e3efb\",\"lessThan\":\"114a116aaa5f0295376cdf12da743c5bce3b20ce\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/android/binder.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:58:44Z",
      "cve": "CVE-2026-64469",
      "id": "CVE-2026-64469",
      "initial_release_date": "2026-07-25T15:58:44Z",
      "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": "2"
    }
  }
}



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