264 lines
14 KiB
JSON
264 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-2026-90419",
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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": "2026-09-11T19:38:34.813Z",
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"datePublished": "2026-09-17T16:09:43.880Z",
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"dateUpdated": "2026-10-19T09:03:23.291Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:03:23.291Z"
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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\nnilfs2: prevent out-of-bounds read in super root block parsing\n\nsuper-root inode metadata size is trusted before nilfs_read_inode_common().\n\nReject super-root inode sizes whose computed on-disk footprint exceeds the\nfilesystem block size. This prevents malformed filesystem images from\nmaking nilfs_read_inode_common() read past the end of the super-root block.\n\n[ryusuke: clarify the commit title]"
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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:N/UI:R/S:U/C:H/I:N/A:H",
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"baseScore": 7.1,
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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 oversized s_inode_size is on-disk in the nilfs2 superblock; nilfs_store_disk_layout() stores it and nilfs_load_super_root() indexes the super-root buffer with NILFS_SR_CPFILE_OFFSET during local mount (nilfs_get_tree → nilfs_fill_super → init_nilfs/load_nilfs). No network protocol carries s_inode_size.\nAC:L - A crafted s_inode_size that still passes ns_inode_size <= ns_blocksize but makes NILFS_SR_BYTES(inode_size) exceed ns_blocksize (for example inode_size == blocksize) puts NILFS_SR_CPFILE_OFFSET/SUFILE_OFFSET past bh_sr->b_data, so nilfs_read_inode_common() over-reads on every mount of that image. There is no race.\nPR:N - Crafting the image needs no host account. nilfs_fs_type.fs_flags is only FS_REQUIRES_DEV (no FS_USERNS_MOUNT), so mount_capable() requires init-namespace CAP_SYS_ADMIN; that privileged mount is the victim's action and is scored as UI:R, not attacker privilege.\nUI:R - The over-read runs only in nilfs_load_super_root() from nilfs_fill_super() after a victim or automounter mounts the attacker-supplied nilfs2 image via mount/fsopen. That mount is the required user interaction.\nS:U - nilfs_read_inode_common()'s over-read of the super-root buffer_head stays in the host kernel mount path and does not cross a VM, IOMMU, or sandbox authority.\nC:H - With inode_size == ns_blocksize, NILFS_SR_CPFILE_OFFSET is 16 bytes past the super-root block, and nilfs_read_inode_common() loads a full 128-byte struct nilfs_inode (including a 56-byte i_bmap memcpy in nilfs_bmap_read) from that address. That is not a few-byte leak.\nI:N - The defect is a source over-read into in-bounds VFS inode and bmap fields; there is no store through the out-of-bounds pointer and no OOB write. Leaked i_bmap words are used only as on-disk block numbers, not as a kernel write primitive.\nA:H - A 4K block with inode_size == 4096 places the cpfile inode 16 bytes past the page-backed super-root buffer, so the 128-byte load can fault on an unmapped next linear-map page (KASAN, debug_pagealloc, page poisoning) and oops the mounting kernel."
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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/nilfs2/the_nilfs.c"
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],
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"versions": [
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{
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"version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
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"lessThan": "16df2520502867a4f34e202b89d01243d59bb8b5",
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"status": "affected",
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"versionType": "git"
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},
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"status": "affected",
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"lessThan": "7029e70cf86d5c54c0a2812479b0bee2cabcbaaa",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "71bd64471ff583101b4a33dfc838ce29aef57960",
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"status": "affected",
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"lessThan": "842397fdfd2e61d6470166c796f3125b6c27a162",
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"status": "affected",
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{
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"version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
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"lessThan": "15c8559376416a84c3d8402fd8d0c89bb323d05f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "8a9d2191e9f43bbcd256a9a6871bd73434c83f2f",
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"lessThan": "7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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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/nilfs2/the_nilfs.c"
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],
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"versions": [
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{
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"version": "2.6.30",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.30",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.270",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.221",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.188",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.157",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.110",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"operator": "OR",
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"negate": false,
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/16df2520502867a4f34e202b89d01243d59bb8b5"
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},
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{
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"url": "https://git.kernel.org/stable/c/dcc85fc28f884038735464f6f104dda9c7dbfad6"
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},
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{
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"url": "https://git.kernel.org/stable/c/5b69ebe20d7f944c1f45177dca0c11474ac277cc"
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},
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{
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"url": "https://git.kernel.org/stable/c/7029e70cf86d5c54c0a2812479b0bee2cabcbaaa"
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},
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{
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"url": "https://git.kernel.org/stable/c/71bd64471ff583101b4a33dfc838ce29aef57960"
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},
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{
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"url": "https://git.kernel.org/stable/c/842397fdfd2e61d6470166c796f3125b6c27a162"
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},
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{
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"url": "https://git.kernel.org/stable/c/15c8559376416a84c3d8402fd8d0c89bb323d05f"
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},
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{
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"url": "https://git.kernel.org/stable/c/7cb2f76a6a2ba2130b577cb8ac13e1e46c4fc689"
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}
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],
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"title": "nilfs2: prevent out-of-bounds read in super root block parsing",
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"x_generator": {
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