330 lines
18 KiB
JSON
330 lines
18 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-2023-53311",
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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": "2025-09-16T16:08:59.562Z",
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"datePublished": "2025-09-16T16:11:49.099Z",
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"dateUpdated": "2026-08-05T09:13:26.871Z"
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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": "2026-08-05T09:13:26.871Z"
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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: fix use-after-free of nilfs_root in dirtying inodes via iput\n\nDuring unmount process of nilfs2, nothing holds nilfs_root structure after\nnilfs2 detaches its writer in nilfs_detach_log_writer(). Previously,\nnilfs_evict_inode() could cause use-after-free read for nilfs_root if\ninodes are left in \"garbage_list\" and released by nilfs_dispose_list at\nthe end of nilfs_detach_log_writer(), and this bug was fixed by commit\n9b5a04ac3ad9 (\"nilfs2: fix use-after-free bug of nilfs_root in\nnilfs_evict_inode()\").\n\nHowever, it turned out that there is another possibility of UAF in the\ncall path where mark_inode_dirty_sync() is called from iput():\n\nnilfs_detach_log_writer()\n nilfs_dispose_list()\n iput()\n mark_inode_dirty_sync()\n __mark_inode_dirty()\n nilfs_dirty_inode()\n __nilfs_mark_inode_dirty()\n nilfs_load_inode_block() --> causes UAF of nilfs_root struct\n\nThis can happen after commit 0ae45f63d4ef (\"vfs: add support for a\nlazytime mount option\"), which changed iput() to call\nmark_inode_dirty_sync() on its final reference if i_state has I_DIRTY_TIME\nflag and i_nlink is non-zero.\n\nThis issue appears after commit 28a65b49eb53 (\"nilfs2: do not write dirty\ndata after degenerating to read-only\") when using the syzbot reproducer,\nbut the issue has potentially existed before.\n\nFix this issue by adding a \"purging flag\" to the nilfs structure, setting\nthat flag while disposing the \"garbage_list\" and checking it in\n__nilfs_mark_inode_dirty().\n\nUnlike commit 9b5a04ac3ad9 (\"nilfs2: fix use-after-free bug of nilfs_root\nin nilfs_evict_inode()\"), this patch does not rely on ns_writer to\ndetermine whether to skip operations, so as not to break recovery on\nmount. The nilfs_salvage_orphan_logs routine dirties the buffer of\nsalvaged data before attaching the log writer, so changing\n__nilfs_mark_inode_dirty() to skip the operation when ns_writer is NULL\nwill cause recovery write to fail. The purpose of using the cleanup-only\nflag is to allow for narrowing of such conditions."
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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 only through local nilfs2 mount/unmount teardown (nilfs_put_super→nilfs_detach_log_writer→nilfs_dispose_list→iput); nothing in this path processes network or peer-supplied packets.\nAC:L - Free-then-use is a fixed sequential ordering inside nilfs_detach_log_writer (nilfs_segctor_destroy frees nilfs_root via nilfs_put_root, then nilfs_dispose_list uses it), not a race; the attacker controls the crafted image and dirty-inode preconditions, and syzbot reproduced it reliably.\nPR:L - An unprivileged local desktop/kiosk user suffices: udisks2/polkit auto-mounts and ejects removable nilfs2 media on the session user's behalf, and stranding inodes on ns_dirty_files uses ordinary unprivileged VFS operations—matching PR:L for the same-family nilfs2 UAF CVE-2023-53804.\nUI:N - On an auto-mounting host the attacker supplies the image, dirties inodes (I_DIRTY_TIME/lazytime path), and triggers eject/unmount themselves; no separate victim action is required.\nS:U - The freed nilfs_root/ifile objects and any resulting heap corruption remain within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After kfree(root), nilfs_load_inode_block reads ii->i_root->ifile from reclaimable kmalloc-256 slab memory and feeds that pointer into nilfs_ifile_get_inode_block/nilfs_update_inode, so a groomed replacement yields an attacker-chosen inode pointer and arbitrary kernel memory disclosure.\nI:H - __nilfs_mark_inode_dirty continues through nilfs_update_inode (writes raw inode contents via the attacker-controlled ifile) and nilfs_mdt_mark_dirty(ii->i_root->ifile), giving write primitives through the reclaimed object suitable for control-flow hijacking.\nA:H - This is a KASAN-confirmed slab use-after-free; dereferencing the freed nilfs_root during unmount readily oopses or panics the kernel even without successful exploitation."
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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/inode.c",
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"fs/nilfs2/segment.c",
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"fs/nilfs2/the_nilfs.h"
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],
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"versions": [
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{
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"lessThan": "11afd67f1b3c28eb216e50a3ca8dbcb69bb71793",
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"status": "affected",
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"status": "affected",
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"lessThan": "d2c539c216cce74837a9cf5804eb205939b82227",
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"status": "affected",
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"status": "affected",
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"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8",
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"lessThan": "3645510cf926e6af2f4d44899370d7e5331c93bd",
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"status": "affected",
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"version": "0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8",
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"lessThan": "7532ff6edbf5242376b24a95a2fefb59bb653e5a",
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"status": "affected",
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"lessThan": "5828d5f5dc877dcfdd7b23102e978e2ecfd86d82",
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"status": "affected",
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"lessThan": "f8654743a0e6909dc634cbfad6db6816f10f3399",
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"status": "affected",
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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/inode.c",
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"fs/nilfs2/segment.c",
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"fs/nilfs2/the_nilfs.h"
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],
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"versions": [
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{
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"version": "4.0",
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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": "4.0",
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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": "4.14.323",
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"lessThanOrEqual": "4.14.*",
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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": "4.19.292",
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"lessThanOrEqual": "4.19.*",
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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": "5.4.254",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.191",
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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": "5.15.127",
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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": "6.1.46",
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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": "6.4.11",
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"lessThanOrEqual": "6.4.*",
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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": "6.5",
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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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"cpeApplicability": [
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"references": [
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},
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{
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"url": "https://git.kernel.org/stable/c/a3c3b4cbf9b8554120fb230e6516e980c6277487"
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},
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{
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"url": "https://git.kernel.org/stable/c/d2c539c216cce74837a9cf5804eb205939b82227"
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},
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{
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"url": "https://git.kernel.org/stable/c/37207240872456fbab44a110bde6640445233963"
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},
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{
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"url": "https://git.kernel.org/stable/c/3645510cf926e6af2f4d44899370d7e5331c93bd"
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},
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{
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"url": "https://git.kernel.org/stable/c/7532ff6edbf5242376b24a95a2fefb59bb653e5a"
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},
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{
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"url": "https://git.kernel.org/stable/c/5828d5f5dc877dcfdd7b23102e978e2ecfd86d82"
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},
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{
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"url": "https://git.kernel.org/stable/c/f8654743a0e6909dc634cbfad6db6816f10f3399"
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}
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],
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"title": "nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"cvssV3_1": {
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"scope": "UNCHANGED",
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"version": "3.1",
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"baseScore": 7.8,
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"attackVector": "LOCAL",
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"baseSeverity": "HIGH",
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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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"integrityImpact": "HIGH",
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"userInteraction": "NONE",
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"attackComplexity": "LOW",
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"availabilityImpact": "HIGH",
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"privilegesRequired": "LOW",
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"confidentialityImpact": "HIGH"
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}
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},
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2023-53311",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-01-14T18:24:44.425794Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-01-14T18:32:57.096Z"
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}
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}
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]
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}
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} |