335 lines
18 KiB
JSON
335 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-2024-47740",
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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": "2024-09-30T16:00:12.959Z",
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"datePublished": "2024-10-21T12:14:09.171Z",
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"dateUpdated": "2026-08-05T11:39:50.713Z"
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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": "2026-08-05T11:39:50.713Z"
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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\nf2fs: Require FMODE_WRITE for atomic write ioctls\n\nThe F2FS ioctls for starting and committing atomic writes check for\ninode_owner_or_capable(), but this does not give LSMs like SELinux or\nLandlock an opportunity to deny the write access - if the caller's FSUID\nmatches the inode's UID, inode_owner_or_capable() immediately returns true.\n\nThere are scenarios where LSMs want to deny a process the ability to write\nparticular files, even files that the FSUID of the process owns; but this\ncan currently partially be bypassed using atomic write ioctls in two ways:\n\n - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can\n truncate an inode to size 0\n - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert\n changes another process concurrently made to a file\n\nFix it by requiring FMODE_WRITE for these operations, just like for\nF2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these\nioctls when intending to write into the file, that seems unlikely to break\nanything."
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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:N/I:H/A:H",
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"baseScore": 7.1,
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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 - Exploitation requires issuing F2FS_IOC_START_ATOMIC_REPLACE/COMMIT/ABORT ioctls on a local file descriptor for a regular file on a locally-mounted f2fs filesystem. There is no network-reachable path to fs/f2fs/file.c ioctl handlers.\nAC:L - The destructive primitive is two deterministic ioctl calls on an fd the attacker already holds — no race, no memory-layout dependency, no timing sensitivity. Even the rollback variant is attacker-timed: it chooses when to START and when to ABORT, and any concurrent writes landing in that window are discarded, so a wider window simply catches more.\nPR:L - Only local unprivileged code execution plus an O_RDONLY fd on a file whose UID matches the attacker's FSUID is needed; inode_owner_or_capable() short-circuits on the UID match, so no capability, user namespace, or root is required. mnt_want_write_file() checks only that the mount is writable, not the fd.\nUI:N - START_ATOMIC_REPLACE + COMMIT_ATOMIC_WRITE truncates the file to zero entirely under attacker control, with no victim action required. The attacker opens the file itself and needs nothing from any other process.\nS:U - The vulnerable f2fs ioctl handler and the impacted files are both governed by the kernel's security authority; bypassing an in-kernel LSM check is not a crossing into a different authority. No hypervisor, IOMMU, or VM boundary is traversed.\nC:N - The bug is purely a missing write-side access-control check — the attacker already holds read access to the target file, so nothing new is disclosed. No kernel memory is leaked and no read primitive is created.\nI:H - The attacker gains write-equivalent power over files the security policy explicitly protected from modification: complete irreversible truncation to size 0, and silent rollback of another process's already-acknowledged writes. For a Landlock- or SELinux-confined process the protected file set is exactly what falls, and every byte of it can be destroyed — a total loss of integrity for the affected resources.\nA:H - Truncating a target such as a system database, keystore, or configuration file to zero permanently destroys the resource and renders the depending service unavailable. Independently, the attacker can pin the inode in atomic-write state for as long as it chooses, causing all O_DIRECT reads/writes from legitimate processes to fail -EOPNOTSUPP and fallocate/MOVE_RANGE/SET_PIN_FILE/defrag to fail -EINVAL — a sustained, attacker-controlled denial of service."
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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/f2fs/file.c"
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],
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"versions": [
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{
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"version": "88b88a66797159949cec32eaab12b4968f6fae2d",
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"lessThan": "700f3a7c7fa5764c9f24bbf7c78e0b6e479fa653",
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"status": "affected",
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"versionType": "git"
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},
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"lessThan": "4ce87674c3a6b4d3b3d45f85b584ab8618a3cece",
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"status": "affected",
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"status": "affected",
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},
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{
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"version": "88b88a66797159949cec32eaab12b4968f6fae2d",
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"lessThan": "32f348ecc149e9ca70a1c424ae8fa9b6919d2713",
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"status": "affected",
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{
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"version": "88b88a66797159949cec32eaab12b4968f6fae2d",
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"lessThan": "5e0de753bfe87768ebe6744d869caa92f35e5731",
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"status": "affected",
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{
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"version": "88b88a66797159949cec32eaab12b4968f6fae2d",
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"lessThan": "f3bfac2cabf5333506b263bc0c8497c95302f32d",
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"status": "affected",
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{
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"version": "88b88a66797159949cec32eaab12b4968f6fae2d",
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"lessThan": "4583290898c13c2c2e5eb8773886d153c2c5121d",
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"status": "affected",
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{
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"version": "88b88a66797159949cec32eaab12b4968f6fae2d",
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"lessThan": "4f5a100f87f32cb65d4bb1ad282a08c92f6f591e",
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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/f2fs/file.c"
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],
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"versions": [
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{
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"version": "3.18",
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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": "3.18",
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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": "4.19.323",
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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": "5.4.285",
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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": "5.10.227",
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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": "5.15.168",
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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": "6.1.113",
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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": "6.6.54",
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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": "6.10.13",
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"lessThanOrEqual": "6.10.*",
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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": "6.11.2",
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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",
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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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"url": "https://git.kernel.org/stable/c/5e0de753bfe87768ebe6744d869caa92f35e5731"
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"url": "https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95302f32d"
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"url": "https://git.kernel.org/stable/c/4583290898c13c2c2e5eb8773886d153c2c5121d"
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"url": "https://git.kernel.org/stable/c/4f5a100f87f32cb65d4bb1ad282a08c92f6f591e"
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}
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],
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"title": "f2fs: Require FMODE_WRITE for atomic write ioctls",
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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-2024-47740",
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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": "partial"
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],
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"version": "2.0.3",
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"timestamp": "2024-10-21T12:59:19.414286Z"
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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": "2024-10-21T13:04:14.597Z"
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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/2025/03/msg00002.html"
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},
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"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
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} |