{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23184", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.984Z", "datePublished": "2026-02-14T16:27:14.167Z", "dateUpdated": "2026-08-05T12:20:31.428Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:20:31.428Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF in binder_netlink_report()\n\nOneway transactions sent to frozen targets via binder_proc_transaction()\nreturn a BR_TRANSACTION_PENDING_FROZEN error but they are still treated\nas successful since the target is expected to thaw at some point. It is\nthen not safe to access 't' after BR_TRANSACTION_PENDING_FROZEN errors\nas the transaction could have been consumed by the now thawed target.\n\nThis is the case for binder_netlink_report() which derreferences 't'\nafter a pending frozen error, as pointed out by the following KASAN\nreport:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in binder_netlink_report.isra.0+0x694/0x6c8\n Read of size 8 at addr ffff00000f98ba38 by task binder-util/522\n\n CPU: 4 UID: 0 PID: 522 Comm: binder-util Not tainted 6.19.0-rc6-00015-gc03e9c42ae8f #1 PREEMPT\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n binder_netlink_report.isra.0+0x694/0x6c8\n binder_transaction+0x66e4/0x79b8\n binder_thread_write+0xab4/0x4440\n binder_ioctl+0x1fd4/0x2940\n [...]\n\n Allocated by task 522:\n __kmalloc_cache_noprof+0x17c/0x50c\n binder_transaction+0x584/0x79b8\n binder_thread_write+0xab4/0x4440\n binder_ioctl+0x1fd4/0x2940\n [...]\n\n Freed by task 488:\n kfree+0x1d0/0x420\n binder_free_transaction+0x150/0x234\n binder_thread_read+0x2d08/0x3ce4\n binder_ioctl+0x488/0x2940\n [...]\n ==================================================================\n\nInstead, make a transaction copy so the data can be safely accessed by\nbinder_netlink_report() after a pending frozen error. While here, add a\ncomment about not using t->buffer in binder_netlink_report()." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Binder is accessed via /dev/binder device file through ioctl(BINDER_WRITE_READ), requiring local system access. It is not reachable over the network.\nAC:L - The attacker controls both sides of the race: they freeze the target via BINDER_FREEZE (no privilege check), send the oneway transaction, then thaw the target to trigger the free. This makes the race reliably triggerable.\nPR:L - Any unprivileged process that can open /dev/binder can trigger this. On Android, any app has binder access. No special capabilities or root privileges are required.\nUI:N - No user interaction is needed. The attacker can trigger the entire sequence (freeze, send transaction, thaw) programmatically without any victim action.\nS:U - This is a standard kernel UAF exploitable for privilege escalation within the same security authority (kernel). No VM escape or sandbox boundary crossing is involved.\nC:H - The UAF allows reading freed kernel heap memory. With heap spraying to control the freed object's contents, an attacker can achieve arbitrary kernel memory reads.\nI:H - The UAF enables heap spraying the freed binder_transaction object, giving the attacker write primitives and control flow hijacking capability in the kernel.\nA:H - As demonstrated by the KASAN report, accessing freed memory causes a kernel crash. The UAF reliably triggers a kernel oops/panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/android/binder.c" ], "versions": [ { "version": "63740349eba78f242bcbf60d5244d7f2b2600853", "lessThan": "a6050dedb6f1cc23e518e3a132ab74a0aad6df90", "status": "affected", "versionType": "git" }, { "version": "63740349eba78f242bcbf60d5244d7f2b2600853", "lessThan": "5e8a3d01544282e50d887d76f30d1496a0a53562", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/android/binder.c" ], "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.10", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.18.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.19" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a6050dedb6f1cc23e518e3a132ab74a0aad6df90" }, { "url": "https://git.kernel.org/stable/c/5e8a3d01544282e50d887d76f30d1496a0a53562" } ], "title": "binder: fix UAF in binder_netlink_report()", "x_generator": { "engine": "bippy-1.2.0" } } } }