291 lines
14 KiB
JSON
291 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-52852",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-21T15:19:24.255Z",
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"datePublished": "2024-05-21T15:31:47.889Z",
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"dateUpdated": "2026-08-05T09:11:41.937Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:11:41.937Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: compress: fix to avoid use-after-free on dic\n\nCall trace:\n __memcpy+0x128/0x250\n f2fs_read_multi_pages+0x940/0xf7c\n f2fs_mpage_readpages+0x5a8/0x624\n f2fs_readahead+0x5c/0x110\n page_cache_ra_unbounded+0x1b8/0x590\n do_sync_mmap_readahead+0x1dc/0x2e4\n filemap_fault+0x254/0xa8c\n f2fs_filemap_fault+0x2c/0x104\n __do_fault+0x7c/0x238\n do_handle_mm_fault+0x11bc/0x2d14\n do_mem_abort+0x3a8/0x1004\n el0_da+0x3c/0xa0\n el0t_64_sync_handler+0xc4/0xec\n el0t_64_sync+0x1b4/0x1b8\n\nIn f2fs_read_multi_pages(), once f2fs_decompress_cluster() was called if\nwe hit cached page in compress_inode's cache, dic may be released, it needs\nbreak the loop rather than continuing it, in order to avoid accessing\ninvalid dic pointer."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The UAF is reached via local VFS read/mmap fault → f2fs_readahead → f2fs_mpage_readpages → f2fs_read_multi_pages on a compression-enabled f2fs inode; no network or adjacent protocol handler exercises this path.\nAC:L - An unprivileged attacker can reliably prime compress_inode cache (read compressed data, then posix_fadvise/DONTNEED or reclaim pagecache) and re-fault so f2fs_load_compressed_page hits and frees dic; no condition outside attacker control is required on Android deployments that already mount with compress_cache.\nPR:L - Only an unprivileged local account with read access to a compressed f2fs file is needed (e.g. an app mmapping its own compress_extension=apk file on Android /data); no capabilities are checked on the fault/readahead path.\nUI:N - The attacker triggers the bug themselves by reading/mmapping their own compressed file on an already-mounted f2fs volume; no separate victim action is required.\nS:U - Impact is confined to the host kernel heap and f2fs pagecache under the same security authority; this is standard kernel privilege escalation with no VM/IOMMU/sandbox boundary crossed.\nC:H - Use-after-free of decompress_io_ctx (and its cpages) after f2fs_decompress_cluster frees dic enables heap reuse and arbitrary kernel read primitives per UAF scoring guidance.\nI:H - Continuing the loop after dic is freed yields UAF writes (including memcpy into reclaimed cpage memory), enabling heap spray and control-flow hijack primitives typical of kernel UAFs.\nA:H - The reported call trace is a kernel fault in __memcpy while touching the freed dic/cpages path, so the bug causes oops/panic even when not fully exploited."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/data.c"
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"version": "5.15.139",
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"version": "6.7",
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