{"id":"CVE-2026-64468","state":"PUBLISHED","title":"binder: fix UAF in binder_free_transaction()","description":"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->to_proc is read under the t->lock.\nHowever, once the t->lock 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->to_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.","publishedAt":"2026-07-25T08:51:33.364Z","updatedAt":"2026-08-17T04:56:13.826Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"5602a43f251c3d75312df91a422675fc00ca3dce","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"0be901ab1dcc4af59b88f2e324493bb283850167","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"48aeda9f8039e4a6971d1804578efde7f2c01eda","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"45df558c543bb5543bacc8065fd7c567740781e5","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"d45ef513eed1abebfec90c3cfb6ae50c2a4182db","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"328ccf32acb87e8bbb1fe2b065068c574e4db2bf","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"0f15f0f6ca5df566275ce517f257af2559528b41","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"f223d27a546c1e1f48d38fd67760e78f068fe8c4","versionType":"git"},{"version":"a4a3c070b8760f71c8311399fa9bfe67c8629bca","status":"affected","versionType":"git"},{"version":"22068d49d09d2b3890e19d7b2048a33340f992da","status":"affected","versionType":"git"},{"version":"0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9","status":"affected","versionType":"git"},{"version":"4.14.136","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.64","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.1.15","status":"affected","lessThan":"5.2","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/android/binder.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/android/binder.c"]}],"references":["https://git.kernel.org/stable/c/5602a43f251c3d75312df91a422675fc00ca3dce","https://git.kernel.org/stable/c/0be901ab1dcc4af59b88f2e324493bb283850167","https://git.kernel.org/stable/c/48aeda9f8039e4a6971d1804578efde7f2c01eda","https://git.kernel.org/stable/c/45df558c543bb5543bacc8065fd7c567740781e5","https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db","https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf","https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41","https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64468.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64468","state":"PUBLISHED","datePublished":"2026-07-25T08:51:33.364Z","dateUpdated":"2026-08-17T04:56:13.826Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.790Z"},"containers":{"cna":{"title":"binder: fix UAF in binder_free_transaction()","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->to_proc is read under the t->lock.\nHowever, once the t->lock 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->to_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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"5602a43f251c3d75312df91a422675fc00ca3dce","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"0be901ab1dcc4af59b88f2e324493bb283850167","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"48aeda9f8039e4a6971d1804578efde7f2c01eda","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"45df558c543bb5543bacc8065fd7c567740781e5","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"d45ef513eed1abebfec90c3cfb6ae50c2a4182db","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"328ccf32acb87e8bbb1fe2b065068c574e4db2bf","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"0f15f0f6ca5df566275ce517f257af2559528b41","versionType":"git"},{"version":"a370003cc301d4361bae20c9ef615f89bf8d1e8a","status":"affected","lessThan":"f223d27a546c1e1f48d38fd67760e78f068fe8c4","versionType":"git"},{"version":"a4a3c070b8760f71c8311399fa9bfe67c8629bca","status":"affected","versionType":"git"},{"version":"22068d49d09d2b3890e19d7b2048a33340f992da","status":"affected","versionType":"git"},{"version":"0e3b977a8f1be01dcfa0baae68851b1f55f2a0a9","status":"affected","versionType":"git"},{"version":"4.14.136","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.64","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.1.15","status":"affected","lessThan":"5.2","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/android/binder.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.2","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/android/binder.c"]}],"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"},{"url":"https://git.kernel.org/stable/c/d45ef513eed1abebfec90c3cfb6ae50c2a4182db"},{"url":"https://git.kernel.org/stable/c/328ccf32acb87e8bbb1fe2b065068c574e4db2bf"},{"url":"https://git.kernel.org/stable/c/0f15f0f6ca5df566275ce517f257af2559528b41"},{"url":"https://git.kernel.org/stable/c/f223d27a546c1e1f48d38fd67760e78f068fe8c4"}],"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 - 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":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:56:13.826Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.2","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.136"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.64"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.1.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}