326 lines
17 KiB
JSON
326 lines
17 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-2021-47638",
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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": "2025-02-26T01:48:21.519Z",
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"datePublished": "2025-02-26T01:54:11.178Z",
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"dateUpdated": "2026-08-05T08:48:43.826Z"
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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": "2026-08-05T08:48:43.826Z"
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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\nubifs: rename_whiteout: Fix double free for whiteout_ui->data\n\n'whiteout_ui->data' will be freed twice if space budget fail for\nrename whiteout operation as following process:\n\nrename_whiteout\n dev = kmalloc\n whiteout_ui->data = dev\n kfree(whiteout_ui->data) // Free first time\n iput(whiteout)\n ubifs_free_inode\n kfree(ui->data)\t // Double free!\n\nKASAN reports:\n==================================================================\nBUG: KASAN: double-free or invalid-free in ubifs_free_inode+0x4f/0x70\nCall Trace:\n kfree+0x117/0x490\n ubifs_free_inode+0x4f/0x70 [ubifs]\n i_callback+0x30/0x60\n rcu_do_batch+0x366/0xac0\n __do_softirq+0x133/0x57f\n\nAllocated by task 1506:\n kmem_cache_alloc_trace+0x3c2/0x7a0\n do_rename+0x9b7/0x1150 [ubifs]\n ubifs_rename+0x106/0x1f0 [ubifs]\n do_syscall_64+0x35/0x80\n\nFreed by task 1506:\n kfree+0x117/0x490\n do_rename.cold+0x53/0x8a [ubifs]\n ubifs_rename+0x106/0x1f0 [ubifs]\n do_syscall_64+0x35/0x80\n\nThe buggy address belongs to the object at ffff88810238bed8 which\nbelongs to the cache kmalloc-8 of size 8\n==================================================================\n\nLet ubifs_free_inode() free 'whiteout_ui->data'. BTW, delete unused\nassignment 'whiteout_ui->data_len = 0', process 'ubifs_evict_inode()\n-> ubifs_jnl_delete_inode() -> ubifs_jnl_write_inode()' doesn't need it\n(because 'inc_nlink(whiteout)' won't be excuted by 'goto out_release',\n and the nlink of whiteout inode is 0)."
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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 bug is reached via renameat2(RENAME_WHITEOUT) on a mounted UBIFS volume (syscall → vfs_rename → ubifs_rename → do_rename), not via network packet processing.\nAC:L - An attacker with write access can reliably force the whiteout ubifs_budget_space() failure by exhausting free space or concurrent budget pressure after earlier budgets succeed; no conditions outside attacker control are required.\nPR:L - RENAME_WHITEOUT needs only directory write/exec permission; CAP_MKNOD is not required (unprivileged whiteouts since a3c751a50fe6), so a normal local user on writable UBIFS (e.g. Android/embedded data) can trigger it.\nUI:N - The attacker issues renameat2 themselves on an already-mounted writable UBIFS; no separate victim action is required.\nS:U - Impact is confined to the local kernel/host authority (privilege escalation or crash); it does not cross a VM, IOMMU, or other security boundary.\nC:H - This is a double-free of a kmalloc object with an RCU grace period before the second free, enabling heap reclaim and arbitrary read primitives from corrupted allocator/object state.\nI:H - The same double-free/heap corruption is exploitable for arbitrary write and control-flow hijacking via spraying the reclaimed kmalloc-8 slot between the two frees.\nA:H - The double-free triggers KASAN/invalid-free and can oops or panic the kernel even without full 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/ubifs/dir.c"
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],
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"versions": [
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{
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"version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
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"lessThan": "8b3c7be16f3f4dfd6e15ac651484e59d3fa36274",
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"status": "affected",
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},
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"version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
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"lessThan": "2b3236ecf96db7af5836e1366ce39ace8ce832fa",
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"status": "affected",
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},
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"version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
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"lessThan": "14276d38c89a170363e90b6ac0a53c3cf61b87fc",
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"status": "affected",
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},
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"version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
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"lessThan": "2ad07009c459e56ebdcc089d850d664660fdb742",
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"status": "affected",
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{
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"lessThan": "b9a937f096e608b3368c1abc920d4d640ba2c94f",
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"status": "affected",
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"version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
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"lessThan": "6d7a158a7363c1f6604aa47ae1a280a5c65123dd",
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"status": "affected",
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},
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{
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"version": "9e0a1fff8db56eaaebb74b4a3ef65f86811c4798",
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"lessThan": "40a8f0d5e7b3999f096570edab71c345da812e3e",
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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/ubifs/dir.c"
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],
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"versions": [
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{
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"version": "4.9",
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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": "4.9",
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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": "4.14.276",
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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": "4.19.238",
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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": "5.4.189",
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"lessThanOrEqual": "5.4.*",
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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": "5.10.110",
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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": "5.15.33",
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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": "5.16.19",
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"lessThanOrEqual": "5.16.*",
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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": "5.17.2",
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"lessThanOrEqual": "5.17.*",
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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": "5.18",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.9",
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"versionEndExcluding": "4.14.276"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/8b3c7be16f3f4dfd6e15ac651484e59d3fa36274"
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},
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{
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"url": "https://git.kernel.org/stable/c/2b3236ecf96db7af5836e1366ce39ace8ce832fa"
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},
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{
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"url": "https://git.kernel.org/stable/c/14276d38c89a170363e90b6ac0a53c3cf61b87fc"
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},
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{
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"url": "https://git.kernel.org/stable/c/a90e2dbe66d2647ff95a0442ad2e86482d977fd8"
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},
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{
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"url": "https://git.kernel.org/stable/c/2ad07009c459e56ebdcc089d850d664660fdb742"
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},
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{
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"url": "https://git.kernel.org/stable/c/b9a937f096e608b3368c1abc920d4d640ba2c94f"
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},
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{
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"url": "https://git.kernel.org/stable/c/6d7a158a7363c1f6604aa47ae1a280a5c65123dd"
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},
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{
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"url": "https://git.kernel.org/stable/c/40a8f0d5e7b3999f096570edab71c345da812e3e"
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}
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],
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"title": "ubifs: rename_whiteout: Fix double free for whiteout_ui->data",
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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": 5.5,
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"attackVector": "LOCAL",
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"baseSeverity": "MEDIUM",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"integrityImpact": "NONE",
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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": "NONE"
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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-2021-47638",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2025-10-01T19:50:47.905064Z"
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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-415",
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"description": "CWE-415 Double 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": "2025-10-01T19:57:08.545Z"
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}
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}
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]
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}
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} |