310 lines
16 KiB
JSON
310 lines
16 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-2022-49850",
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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": "2025-05-01T14:05:17.230Z",
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"datePublished": "2025-05-01T14:10:05.167Z",
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"dateUpdated": "2026-05-11T19:07:57.952Z"
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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": "2026-05-11T19:07:57.952Z"
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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 deadlock in nilfs_count_free_blocks()\n\nA semaphore deadlock can occur if nilfs_get_block() detects metadata\ncorruption while locating data blocks and a superblock writeback occurs at\nthe same time:\n\ntask 1 task 2\n------ ------\n* A file operation *\nnilfs_truncate()\n nilfs_get_block()\n down_read(rwsem A) <--\n nilfs_bmap_lookup_contig()\n ... generic_shutdown_super()\n nilfs_put_super()\n * Prepare to write superblock *\n down_write(rwsem B) <--\n nilfs_cleanup_super()\n * Detect b-tree corruption * nilfs_set_log_cursor()\n nilfs_bmap_convert_error() nilfs_count_free_blocks()\n __nilfs_error() down_read(rwsem A) <--\n nilfs_set_error()\n down_write(rwsem B) <--\n\n *** DEADLOCK ***\n\nHere, nilfs_get_block() readlocks rwsem A (= NILFS_MDT(dat_inode)->mi_sem)\nand then calls nilfs_bmap_lookup_contig(), but if it fails due to metadata\ncorruption, __nilfs_error() is called from nilfs_bmap_convert_error()\ninside the lock section.\n\nSince __nilfs_error() calls nilfs_set_error() unless the filesystem is\nread-only and nilfs_set_error() attempts to writelock rwsem B (=\nnilfs->ns_sem) to write back superblock exclusively, hierarchical lock\nacquisition occurs in the order rwsem A -> rwsem B.\n\nNow, if another task starts updating the superblock, it may writelock\nrwsem B during the lock sequence above, and can deadlock trying to\nreadlock rwsem A in nilfs_count_free_blocks().\n\nHowever, there is actually no need to take rwsem A in\nnilfs_count_free_blocks() because it, within the lock section, only reads\na single integer data on a shared struct with\nnilfs_sufile_get_ncleansegs(). This has been the case after commit\naa474a220180 (\"nilfs2: add local variable to cache the number of clean\nsegments\"), that is, even before this bug was introduced.\n\nSo, this resolves the deadlock problem by just not taking the semaphore in\nnilfs_count_free_blocks()."
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "3c89ca6d3dfa6c09c515807a7a97a521f5d5147e",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "8b4506cff6630bb474bb46a2a75c31e533a756ba",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "f0cc93080d4c09510b74ecba87fd778cca390bb1",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "36ff974b0310771417c0be64b64aa221bd70d63d",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "1d4ff73062096c21b47954d2996b4df259777bda",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "abc082aac0d9b6b926038fc3adb7008306581be2",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "cb029b54953420f7a2d65100f1c5107f14411bdc",
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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": "e828949e5b42bfd234ee537cdb7c5e3a577958a3",
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"lessThan": "8ac932a4921a96ca52f61935dbba64ea87bbd5dc",
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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": "2.6.38",
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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": "2.6.38",
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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": "4.9.334",
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"lessThanOrEqual": "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": "4.14.300",
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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": "4.19.267",
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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": "5.4.225",
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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": "5.10.155",
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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": "5.15.79",
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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": "6.0.9",
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"lessThanOrEqual": "6.0.*",
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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": "6.1",
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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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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.38",
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"versionEndExcluding": "4.9.334"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3c89ca6d3dfa6c09c515807a7a97a521f5d5147e"
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},
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{
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"url": "https://git.kernel.org/stable/c/8b4506cff6630bb474bb46a2a75c31e533a756ba"
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},
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{
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"url": "https://git.kernel.org/stable/c/f0cc93080d4c09510b74ecba87fd778cca390bb1"
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},
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{
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"url": "https://git.kernel.org/stable/c/36ff974b0310771417c0be64b64aa221bd70d63d"
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},
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{
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"url": "https://git.kernel.org/stable/c/1d4ff73062096c21b47954d2996b4df259777bda"
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},
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{
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"url": "https://git.kernel.org/stable/c/abc082aac0d9b6b926038fc3adb7008306581be2"
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},
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{
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"url": "https://git.kernel.org/stable/c/cb029b54953420f7a2d65100f1c5107f14411bdc"
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},
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{
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"url": "https://git.kernel.org/stable/c/8ac932a4921a96ca52f61935dbba64ea87bbd5dc"
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}
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],
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"title": "nilfs2: fix deadlock in nilfs_count_free_blocks()",
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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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"problemTypes": [
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{
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"descriptions": [
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{
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"type": "CWE",
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"cweId": "CWE-667",
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"lang": "en",
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"description": "CWE-667 Improper Locking"
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}
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]
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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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"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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"timestamp": "2025-10-01T16:11:54.441454Z",
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"id": "CVE-2022-49850",
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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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"role": "CISA Coordinator",
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"version": "2.0.3"
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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": "2025-10-01T16:11:57.101Z"
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}
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}
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]
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}
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} |