342 lines
17 KiB
JSON
342 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-2025-21811",
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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": "2024-12-29T08:45:45.772Z",
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"datePublished": "2025-02-27T20:01:02.256Z",
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"dateUpdated": "2026-08-05T11:54:38.930Z"
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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": "2026-08-05T11:54:38.930Z"
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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: protect access to buffers with no active references\n\nnilfs_lookup_dirty_data_buffers(), which iterates through the buffers\nattached to dirty data folios/pages, accesses the attached buffers without\nlocking the folios/pages.\n\nFor data cache, nilfs_clear_folio_dirty() may be called asynchronously\nwhen the file system degenerates to read only, so\nnilfs_lookup_dirty_data_buffers() still has the potential to cause use\nafter free issues when buffers lose the protection of their dirty state\nmidway due to this asynchronous clearing and are unintentionally freed by\ntry_to_free_buffers().\n\nEliminate this race issue by adjusting the lock section in this function."
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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 - nilfs2 is a block-device filesystem; the race is driven through local file I/O (write/fsync creating dirty data folios) plus local page-cache pressure on a mounted volume. No network reachability exists, so this is a local attack vector.\nAC:L - The attacker controls both sides of the race — a crafted nilfs2 image deterministically forces the errors=remount-ro fallback that triggers the asynchronous nilfs_clear_folio_dirty(), while write/fsync drives the unlocked buffer walk and posix_fadvise(DONTNEED)/memory pressure drives try_to_free_buffers(). The race window can be retried indefinitely.\nPR:L - An unprivileged local user with write access to a nilfs2 mount that has degraded to read-only can drive both the dirty-buffer collection path and the buffer-freeing path with no capabilities; on desktop/kiosk systems udisks2 auto-mount also lets an unprivileged user get a crafted image mounted.\nUI:N - On an already-mounted nilfs2 volume no victim action is needed — the attacker's own writes, fsync, and cache-eviction calls trigger the race against the always-running segment constructor thread.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed buffer_head is read (b_state, b_this_page, b_data, b_page) and queued for actual segment write-out, so contents of a reallocated slab object can be leaked into the on-disk log and read back; a UAF of this shape yields an arbitrary-read primitive.\nI:H - The loop performs get_bh() (atomic_inc) and list_add_tail(&bh->b_assoc_buffers, listp) into the freed bh_cachep object, writing attacker-influenceable pointers into whatever object now occupies that slot — a controllable write primitive suitable for heap grooming and control-flow hijack.\nA:H - Walking and linking freed buffer_heads reliably produces list corruption, slab corruption, and kernel oops/panic, taking the system down."
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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/segment.c"
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],
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"versions": [
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{
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"version": "8c26c4e2694a163d525976e804d81cd955bbb40c",
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"lessThan": "e1fc4a90a90ea8514246c45435662531975937d9",
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"status": "affected",
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"versionType": "git"
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"lessThan": "72cf688d0ce7e642b12ddc9b2a42524737ec1b4a",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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},
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"lessThan": "8e1b9201c9a24638cf09c6e1c9f224157328010b",
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"status": "affected",
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"status": "affected",
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{
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"status": "affected",
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"lessThan": "367a9bffabe08c04f6d725032cce3d891b2b9e1a",
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"status": "affected",
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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/segment.c"
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],
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"versions": [
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{
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"version": "3.10",
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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": "3.10",
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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": "5.4.291",
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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": "5.10.235",
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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": "5.15.179",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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},
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{
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"version": "6.1.129",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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},
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{
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"version": "6.6.76",
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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": "6.12.13",
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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": "6.13.2",
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"lessThanOrEqual": "6.13.*",
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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": "6.14",
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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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"url": "https://git.kernel.org/stable/c/72cf688d0ce7e642b12ddc9b2a42524737ec1b4a"
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},
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{
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{
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"url": "https://git.kernel.org/stable/c/58c27fa7a610b6e8d44e6220e7dbddfbaccaf439"
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{
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"url": "https://git.kernel.org/stable/c/8e1b9201c9a24638cf09c6e1c9f224157328010b"
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{
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"url": "https://git.kernel.org/stable/c/4b08d23d7d1917bef4fbee8ad81372f49b006656"
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}
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],
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"title": "nilfs2: protect access to buffers with no active references",
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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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"privilegesRequired": "LOW",
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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-2025-21811",
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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": "2025-03-04T18:01:20.629324Z"
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}
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}
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],
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"problemTypes": [
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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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"dateUpdated": "2025-03-04T18:07:17.439Z"
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}
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},
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
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{
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"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
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}
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],
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"dateUpdated": "2025-11-03T20:59:47.268Z"
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} |