{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-27070", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.216Z", "datePublished": "2024-05-01T13:04:26.824Z", "dateUpdated": "2026-08-05T11:29:21.725Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:29:21.725Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid use-after-free issue in f2fs_filemap_fault\n\nsyzbot reports a f2fs bug as below:\n\nBUG: KASAN: slab-use-after-free in f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49\nRead of size 8 at addr ffff88807bb22680 by task syz-executor184/5058\n\nCPU: 0 PID: 5058 Comm: syz-executor184 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:377 [inline]\n print_report+0x163/0x540 mm/kasan/report.c:488\n kasan_report+0x142/0x170 mm/kasan/report.c:601\n f2fs_filemap_fault+0xd1/0x2c0 fs/f2fs/file.c:49\n __do_fault+0x131/0x450 mm/memory.c:4376\n do_shared_fault mm/memory.c:4798 [inline]\n do_fault mm/memory.c:4872 [inline]\n do_pte_missing mm/memory.c:3745 [inline]\n handle_pte_fault mm/memory.c:5144 [inline]\n __handle_mm_fault+0x23b7/0x72b0 mm/memory.c:5285\n handle_mm_fault+0x27e/0x770 mm/memory.c:5450\n do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]\n handle_page_fault arch/x86/mm/fault.c:1507 [inline]\n exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1563\n asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570\n\nThe root cause is: in f2fs_filemap_fault(), vmf->vma may be not alive after\nfilemap_fault(), so it may cause use-after-free issue when accessing\nvmf->vma->vm_flags in trace_f2fs_filemap_fault(). So it needs to keep vm_flags\nin separated temporary variable for tracepoint use." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerability is triggered through page faults on a memory mapping of a local f2fs file, requiring the attacker to execute code on the system (mmap plus a concurrent munmap thread). There is no remote or adjacent-network path into f2fs_filemap_fault().\nAC:L - The attacker controls both sides of the race — one thread faults on an evicted page (forced via MADV_DONTNEED/POSIX_FADV_DONTNEED so do_sync_mmap_readahead must drop the fault lock and block on I/O) while a sibling thread munmaps the VMA — giving a wide, deterministic window that syzkaller reproduced.\nPR:L - Only an ordinary unprivileged local account is needed: no capability, ioctl gate, or admin operation is involved, just creating a file, mmapping it, and faulting. On Android and embedded devices f2fs is already the mounted data filesystem, so any app or user reaches this path directly.\nUI:N - The attacker uses its own file on an already-mounted f2fs volume and drives both the fault and the munmap itself. No victim action such as mounting an image or opening a file is required.\nS:U - The dangling dereference and any resulting disclosure or crash stay entirely within the kernel's own security authority on the affected host. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free read of a freed vm_area_struct whose contents the attacker can groom by spraying the dedicated, easily-controlled vm_area_cachep, and the stale value is exported into the kernel trace buffer via trace_f2fs_filemap_fault (the f2fs event group is enabled in real deployments such as Android/Perfetto tracing), disclosing freed kernel heap contents including pointers.\nI:N - The defect is purely a stale load — the fix merely hoists the vm_flags read before filemap_fault() — and nothing is written to the freed object or anywhere out of bounds. The read value is only passed to a tracepoint and influences no kernel decision or control flow, so no integrity primitive exists.\nA:H - Reading a freed vm_area_struct can fault and oops the kernel — a KFENCE-sampled VMA (KFENCE ships enabled on Android and distro kernels) leaves its page unmapped after free, and DEBUG_PAGEALLOC/KASAN builds panic outright, with panic_on_oops turning this into a full system crash. The race is repeatable indefinitely by an unprivileged process, so the crash can be driven reliably." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/file.c" ], "versions": [ { "version": "b43c3050d21196e5e7024872e3048dba83e31751", "lessThan": "897761d16564e899faecb9381b4818858705081f", "status": "affected", "versionType": "git" }, { "version": "87f3afd366f7c668be0269efda8a89741a3ea6b3", "lessThan": "8186e16a766d709a08f188d2f4e84098f364bea1", "status": "affected", "versionType": "git" }, { "version": "87f3afd366f7c668be0269efda8a89741a3ea6b3", "lessThan": "eb70d5a6c932d9d23f4bb3e7b83782c21ac4b064", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/f2fs/file.c" ], "versions": [ { "version": "6.8", "status": "affected" }, { "version": "0", "lessThan": "6.8", "status": "unaffected", "versionType": "semver" }, { "version": "6.8.2", "lessThanOrEqual": "6.8.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.9", "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": "6.8", "versionEndExcluding": "6.8.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.8", "versionEndExcluding": "6.9" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/897761d16564e899faecb9381b4818858705081f" }, { "url": "https://git.kernel.org/stable/c/8186e16a766d709a08f188d2f4e84098f364bea1" }, { "url": "https://git.kernel.org/stable/c/eb70d5a6c932d9d23f4bb3e7b83782c21ac4b064" } ], "title": "f2fs: fix to avoid use-after-free issue in f2fs_filemap_fault", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-27070", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-05-28T16:13:45.773958Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:47:09.114Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:27:57.831Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8186e16a766d709a08f188d2f4e84098f364bea1", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/eb70d5a6c932d9d23f4bb3e7b83782c21ac4b064", "tags": [ "x_transferred" ] } ] } ] } }