250 lines
13 KiB
JSON
250 lines
13 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-2024-56549",
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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": "2024-12-27T14:03:05.989Z",
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"datePublished": "2024-12-27T14:11:30.336Z",
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"dateUpdated": "2026-10-15T21:41:47.066Z"
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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": "2026-08-05T11:44:58.475Z"
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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\ncachefiles: Fix NULL pointer dereference in object->file\n\nAt present, the object->file has the NULL pointer dereference problem in\nondemand-mode. The root cause is that the allocated fd and object->file\nlifetime are inconsistent, and the user-space invocation to anon_fd uses\nobject->file. Following is the process that triggers the issue:\n\n\t [write fd]\t\t\t\t[umount]\ncachefiles_ondemand_fd_write_iter\n\t\t\t\t fscache_cookie_state_machine\n\t\t\t\t\t cachefiles_withdraw_cookie\n if (!file) return -ENOBUFS\n\t\t\t\t\t cachefiles_clean_up_object\n\t\t\t\t\t cachefiles_unmark_inode_in_use\n\t\t\t\t\t fput(object->file)\n\t\t\t\t\t object->file = NULL\n // file NULL pointer dereference!\n __cachefiles_write(..., file, ...)\n\nFix this issue by add an additional reference count to the object->file\nbefore write/llseek, and decrement after it finished."
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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 vulnerable code is reached through local file-descriptor operations (write()/lseek() on a cachefiles on-demand anon fd) raced against local cookie withdrawal (umount, LRU discard, invalidation). There is no remote or adjacent-network path into fs/cachefiles/ondemand.c.\nAC:L - The attacker controls both sides of the race — they generate the demand-read traffic that makes the daemon write on the anon fd, and they trigger the withdrawal (umount of their erofs-on-fscache mount, or letting the cookie idle past the ~2s LRU timeout) — and can retry the sequence indefinitely until the window is hit.\nPR:L - Although /dev/cachefiles itself requires CAP_SYS_ADMIN, an unprivileged local user of an on-demand erofs/fscache mount (e.g. inside a container using an on-demand image) drives both the daemon's writes and the cookie withdrawal without ever needing the anon fd, so basic unprivileged local access suffices.\nUI:N - No victim action is needed; the cachefiles daemon services demand-read requests automatically as part of normal operation, and the withdrawal path is driven by the attacker's own filesystem activity.\nS:U - The corruption is confined to kernel memory within the same security authority; this is standard kernel memory corruption, not a hypervisor, IOMMU, or sandbox boundary crossing.\nC:H - The use-after-free on struct file lets llseek/SEEK_DATA/SEEK_HOLE and DIO operations act on a freed slot that filp_cachep (SLAB_TYPESAFE_BY_RCU) hands out as an unrelated struct file, exposing freed-memory contents and redirecting reads to files the attacker has no access to.\nI:H - __cachefiles_write() calls get_file() and vfs_iocb_iter_write() on the dangling pointer, inflating a reallocated file's refcount (setting up a further UAF) and writing attacker-influenced cache data — plus fallocate() — into an unrelated open file, giving a controlled write primitive.\nA:H - Dereferencing the freed/NULLed object->file causes a kernel oops or panic, and the refcount corruption on the reallocated struct file leads to further fatal memory corruption."
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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/cachefiles/interface.c",
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"fs/cachefiles/ondemand.c"
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],
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"versions": [
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{
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"version": "c8383054506c77b814489c09877b5db83fd4abf2",
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"lessThan": "d6bba3ece960129a553d4b16f1b00c884dc0993a",
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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": "c8383054506c77b814489c09877b5db83fd4abf2",
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"lessThan": "785408bbafcfa24c9fc5b251f03fd0780ce182bd",
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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": "c8383054506c77b814489c09877b5db83fd4abf2",
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"lessThan": "f98770440c9bc468e2fd878212ec9526dbe08293",
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"status": "affected",
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},
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{
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"lessThan": "9582c7664103c9043e80a78f5c382aa6bdd67418",
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"status": "affected",
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},
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{
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"lessThan": "31ad74b20227ce6b40910ff78b1c604e42975cf1",
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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/cachefiles/interface.c",
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"fs/cachefiles/ondemand.c"
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],
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"versions": [
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{
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"version": "5.19",
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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": "5.19",
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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": "6.1.129",
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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": "6.6.78",
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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": "6.11.11",
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"lessThanOrEqual": "6.11.*",
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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": "6.12.2",
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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",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.1.129"
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},
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"versionEndExcluding": "6.12.2"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/d6bba3ece960129a553d4b16f1b00c884dc0993a"
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},
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{
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"url": "https://git.kernel.org/stable/c/785408bbafcfa24c9fc5b251f03fd0780ce182bd"
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},
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{
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"url": "https://git.kernel.org/stable/c/f98770440c9bc468e2fd878212ec9526dbe08293"
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},
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{
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"url": "https://git.kernel.org/stable/c/9582c7664103c9043e80a78f5c382aa6bdd67418"
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},
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{
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"url": "https://git.kernel.org/stable/c/31ad74b20227ce6b40910ff78b1c604e42975cf1"
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}
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],
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"title": "cachefiles: Fix NULL pointer dereference in object->file",
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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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"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/2025/03/msg00028.html"
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}
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],
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2025-11-03T19:32:24.323Z"
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}
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{
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"metrics": [
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2024-56549",
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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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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-15T21:41:03.958345Z"
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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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} |