{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52438", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.290Z", "datePublished": "2024-02-20T18:34:48.694Z", "dateUpdated": "2026-08-05T09:09:55.580Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:09:55.580Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinder: fix use-after-free in shinker's callback\n\nThe mmap read lock is used during the shrinker's callback, which means\nthat using alloc->vma pointer isn't safe as it can race with munmap().\nAs of commit dd2283f2605e (\"mm: mmap: zap pages with read mmap_sem in\nmunmap\") the mmap lock is downgraded after the vma has been isolated.\n\nI was able to reproduce this issue by manually adding some delays and\ntriggering page reclaiming through the shrinker's debug sysfs. The\nfollowing KASAN report confirms the UAF:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in zap_page_range_single+0x470/0x4b8\n Read of size 8 at addr ffff356ed50e50f0 by task bash/478\n\n CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n zap_page_range_single+0x470/0x4b8\n binder_alloc_free_page+0x608/0xadc\n __list_lru_walk_one+0x130/0x3b0\n list_lru_walk_node+0xc4/0x22c\n binder_shrink_scan+0x108/0x1dc\n shrinker_debugfs_scan_write+0x2b4/0x500\n full_proxy_write+0xd4/0x140\n vfs_write+0x1ac/0x758\n ksys_write+0xf0/0x1dc\n __arm64_sys_write+0x6c/0x9c\n\n Allocated by task 492:\n kmem_cache_alloc+0x130/0x368\n vm_area_alloc+0x2c/0x190\n mmap_region+0x258/0x18bc\n do_mmap+0x694/0xa60\n vm_mmap_pgoff+0x170/0x29c\n ksys_mmap_pgoff+0x290/0x3a0\n __arm64_sys_mmap+0xcc/0x144\n\n Freed by task 491:\n kmem_cache_free+0x17c/0x3c8\n vm_area_free_rcu_cb+0x74/0x98\n rcu_core+0xa38/0x26d4\n rcu_core_si+0x10/0x1c\n __do_softirq+0x2fc/0xd24\n\n Last potentially related work creation:\n __call_rcu_common.constprop.0+0x6c/0xba0\n call_rcu+0x10/0x1c\n vm_area_free+0x18/0x24\n remove_vma+0xe4/0x118\n do_vmi_align_munmap.isra.0+0x718/0xb5c\n do_vmi_munmap+0xdc/0x1fc\n __vm_munmap+0x10c/0x278\n __arm64_sys_munmap+0x58/0x7c\n\nFix this issue by performing instead a vma_lookup() which will fail to\nfind the vma that was isolated before the mmap lock downgrade. Note that\nthis option has better performance than upgrading to a mmap write lock\nwhich would increase contention. Plus, mmap_write_trylock() has been\nrecently removed anyway." } ], "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 vulnerable path is reached through local binder device operations (open/mmap/munmap of /dev/binder or binderfs), not via network packet processing or physical device access.\nAC:L - The attacker controls both sides of the race: they can place binder pages on the shrinker LRU, force reclaim via memory pressure, and concurrently munmap the binder mapping; no conditions outside attacker influence are required.\nPR:L - binder_open/mmap require no capabilities; on Android untrusted apps routinely access binder, and binderfs is FS_USERNS_MOUNT so an unprivileged userns user can create and open binder devices.\nUI:N - Exploitation requires only the attacker's own binder open/mmap/munmap and memory pressure; no action by another user is needed.\nS:U - This is a kernel-memory UAF enabling privilege escalation within the same OS kernel security authority, not a VM/IOMMU boundary escape.\nC:H - Use-after-free of a vm_area_struct lets an attacker reclaim and control the freed object, yielding arbitrary kernel read primitives per UAF guidance.\nI:H - The UAF of the VMA object used by zap_page_range_single is heap-sprayable and can be leveraged for arbitrary kernel writes and control-flow hijacking.\nA:H - Dereferencing the freed VMA in the shrinker path causes kernel oops/panic even without full exploitation, so availability impact is High." } ] } ], "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": "a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "c8c1158ffb007197f31f9d9170cf13e4f34cbb5c", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "9fa04c93f24138747807fe75b5591bb680098f56", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "a49087ab93508b60d9b8add91707a22dda832869", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "e074686e993ff1be5f21b085a3b1b4275ccd5727", "status": "affected", "versionType": "git" }, { "version": "dd2283f2605e3b3e9c61bcae844b34f2afa4813f", "lessThan": "3f489c2067c5824528212b0fc18b28d51332d906", "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": "5.4.268", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.209", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.148", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.74", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.13", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.1", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.4.268" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.10.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "5.15.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.1.74" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.6.13" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.7.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.20", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3" }, { "url": "https://git.kernel.org/stable/c/c8c1158ffb007197f31f9d9170cf13e4f34cbb5c" }, { "url": "https://git.kernel.org/stable/c/8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6" }, { "url": "https://git.kernel.org/stable/c/9fa04c93f24138747807fe75b5591bb680098f56" }, { "url": "https://git.kernel.org/stable/c/a49087ab93508b60d9b8add91707a22dda832869" }, { "url": "https://git.kernel.org/stable/c/e074686e993ff1be5f21b085a3b1b4275ccd5727" }, { "url": "https://git.kernel.org/stable/c/3f489c2067c5824528212b0fc18b28d51332d906" } ], "title": "binder: fix use-after-free in shinker's callback", "x_generator": { "engine": "bippy-1.2.0" 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