{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-54157", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:52.530Z", "datePublished": "2025-12-24T13:07:06.764Z", "dateUpdated": "2026-05-11T19:56:35.464Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-11T19:56:35.464Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix UAF of alloc->vma in race with munmap()\n\n[ cmllamas: clean forward port from commit 015ac18be7de (\"binder: fix\n UAF of alloc->vma in race with munmap()\") in 5.10 stable. It is needed\n in mainline after the revert of commit a43cfc87caaf (\"android: binder:\n stop saving a pointer to the VMA\") as pointed out by Liam. The commit\n log and tags have been tweaked to reflect this. ]\n\nIn commit 720c24192404 (\"ANDROID: binder: change down_write to\ndown_read\") binder assumed the mmap read lock is sufficient to protect\nalloc->vma inside binder_update_page_range(). This used to be accurate\nuntil commit dd2283f2605e (\"mm: mmap: zap pages with read mmap_sem in\nmunmap\"), which now downgrades the mmap_lock after detaching the vma\nfrom the rbtree in munmap(). Then it proceeds to teardown and free the\nvma with only the read lock held.\n\nThis means that accesses to alloc->vma in binder_update_page_range() now\nwill race with vm_area_free() in munmap() and can cause a UAF as shown\nin the following KASAN trace:\n\n ==================================================================\n BUG: KASAN: use-after-free in vm_insert_page+0x7c/0x1f0\n Read of size 8 at addr ffff16204ad00600 by task server/558\n\n CPU: 3 PID: 558 Comm: server Not tainted 5.10.150-00001-gdc8dcf942daa #1\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n dump_backtrace+0x0/0x2a0\n show_stack+0x18/0x2c\n dump_stack+0xf8/0x164\n print_address_description.constprop.0+0x9c/0x538\n kasan_report+0x120/0x200\n __asan_load8+0xa0/0xc4\n vm_insert_page+0x7c/0x1f0\n binder_update_page_range+0x278/0x50c\n binder_alloc_new_buf+0x3f0/0xba0\n binder_transaction+0x64c/0x3040\n binder_thread_write+0x924/0x2020\n binder_ioctl+0x1610/0x2e5c\n __arm64_sys_ioctl+0xd4/0x120\n el0_svc_common.constprop.0+0xac/0x270\n do_el0_svc+0x38/0xa0\n el0_svc+0x1c/0x2c\n el0_sync_handler+0xe8/0x114\n el0_sync+0x180/0x1c0\n\n Allocated by task 559:\n kasan_save_stack+0x38/0x6c\n __kasan_kmalloc.constprop.0+0xe4/0xf0\n kasan_slab_alloc+0x18/0x2c\n kmem_cache_alloc+0x1b0/0x2d0\n vm_area_alloc+0x28/0x94\n mmap_region+0x378/0x920\n do_mmap+0x3f0/0x600\n vm_mmap_pgoff+0x150/0x17c\n ksys_mmap_pgoff+0x284/0x2dc\n __arm64_sys_mmap+0x84/0xa4\n el0_svc_common.constprop.0+0xac/0x270\n do_el0_svc+0x38/0xa0\n el0_svc+0x1c/0x2c\n el0_sync_handler+0xe8/0x114\n el0_sync+0x180/0x1c0\n\n Freed by task 560:\n kasan_save_stack+0x38/0x6c\n kasan_set_track+0x28/0x40\n kasan_set_free_info+0x24/0x4c\n __kasan_slab_free+0x100/0x164\n kasan_slab_free+0x14/0x20\n kmem_cache_free+0xc4/0x34c\n vm_area_free+0x1c/0x2c\n remove_vma+0x7c/0x94\n __do_munmap+0x358/0x710\n __vm_munmap+0xbc/0x130\n __arm64_sys_munmap+0x4c/0x64\n el0_svc_common.constprop.0+0xac/0x270\n do_el0_svc+0x38/0xa0\n el0_svc+0x1c/0x2c\n el0_sync_handler+0xe8/0x114\n el0_sync+0x180/0x1c0\n\n [...]\n ==================================================================\n\nTo prevent the race above, revert back to taking the mmap write lock\ninside binder_update_page_range(). One might expect an increase of mmap\nlock contention. However, binder already serializes these calls via top\nlevel alloc->mutex. Also, there was no performance impact shown when\nrunning the binder benchmark tests." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/android/binder_alloc.c" ], "versions": [ { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "1bb8a65190d45cd5c7dbc85e29b9102110cd6be6", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "931ea1ed31be939c1efdbc49bc66d2a45684f9b4", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "ca0cc0a9c6e56c699e2acbb93d8024523021f3c3", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "d1d8875c8c13517f6fd1ff8d4d3e1ac366a17e07", "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_alloc.c" ], "versions": [ { "version": "4.20", "status": "affected" }, { "version": "0", "lessThan": "4.20", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.115", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.31", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.5", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "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": "4.20", "versionEndExcluding": "5.15.115" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.31" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.3.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/1bb8a65190d45cd5c7dbc85e29b9102110cd6be6" }, { "url": "https://git.kernel.org/stable/c/931ea1ed31be939c1efdbc49bc66d2a45684f9b4" }, { "url": "https://git.kernel.org/stable/c/ca0cc0a9c6e56c699e2acbb93d8024523021f3c3" }, { "url": "https://git.kernel.org/stable/c/d1d8875c8c13517f6fd1ff8d4d3e1ac366a17e07" } ], "title": "binder: fix UAF of alloc->vma in race with munmap()", "x_generator": { "engine": "bippy-1.2.0" } } } }