308 lines
16 KiB
JSON
308 lines
16 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"cveMetadata": {
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"cveId": "CVE-2024-26640",
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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": "2024-02-19T14:20:24.137Z",
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"datePublished": "2024-03-18T10:19:07.025Z",
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"dateUpdated": "2026-08-05T11:26:27.948Z"
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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": "2026-08-05T11:26:27.948Z"
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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\ntcp: add sanity checks to rx zerocopy\n\nTCP rx zerocopy intent is to map pages initially allocated\nfrom NIC drivers, not pages owned by a fs.\n\nThis patch adds to can_map_frag() these additional checks:\n\n- Page must not be a compound one.\n- page->mapping must be NULL.\n\nThis fixes the panic reported by ZhangPeng.\n\nsyzbot was able to loopback packets built with sendfile(),\nmapping pages owned by an ext4 file to TCP rx zerocopy.\n\nr3 = socket$inet_tcp(0x2, 0x1, 0x0)\nmmap(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0)\nr4 = socket$inet_tcp(0x2, 0x1, 0x0)\nbind$inet(r4, &(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10)\nconnect$inet(r4, &(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10)\nr5 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\\x00',\n 0x181e42, 0x0)\nfallocate(r5, 0x0, 0x0, 0x85b8)\nsendfile(r4, r5, 0x0, 0x8ba0)\ngetsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23,\n &(0x7f00000001c0)={&(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0,\n 0x0, 0x0, 0x0, 0x0}, &(0x7f0000000440)=0x40)\nr6 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\\x00',\n 0x181e42, 0x0)"
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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 - Triggering requires local syscalls on the attacker's own process — mmap() of a TCP socket, sendfile() of a page-cache-backed file over loopback, and getsockopt(TCP_ZEROCOPY_RECEIVE). A purely remote peer cannot supply page-cache or compound pages into the receive frags, since those come from the local NIC/page_pool allocator.\nAC:L - The syzbot reproducer is fully deterministic with no race window and no dependence on memory layout: sendfile() guarantees PAGE_SIZE frags at offset 0 pointing at ext4 page-cache pages, and loopback delivers them unchanged to the same socket's receive queue. Follow-on inode eviction is likewise triggered on demand by the attacker via O_TRUNC/unlink+close.\nPR:L - Every step is available to an ordinary unprivileged user — tcp_mmap() performs no capability check, TCP_ZEROCOPY_RECEIVE is unconditionally compiled in under CONFIG_MMU, and sendfile() on a file the user owns needs no privilege. No CAP_NET_ADMIN or namespace trickery is required at all.\nUI:N - A single unprivileged process performs the entire sequence against itself via a loopback self-connect; no victim process must be running, and no administrator or user action is needed.\nS:U - The corruption is confined to the kernel's own page-cache/rmap accounting and the attacking process's address space, managed by the same security authority. There is no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - Because the page is mapped outside the inode's i_mmap tree, filemap_unaccount_folio()'s recovery path resets mapcount and subtracts the PTE's reference, letting the page be freed and reallocated while the attacker retains a valid read-only PTE to it — an arbitrary-read window into whatever kernel data (slab objects, page tables, other processes' pages) subsequently occupies that physical page.\nI:H - The dropped reference plus the later munmap-time page_remove_rmap()/put_page() drives _mapcount and the page refcount negative, producing a double-free of a buddy-allocator page that can be handed out twice and used as a write primitive into kernel-owned memory. The mismatched rmap/_nr_pages_mapped accounting for compound folios corrupts kernel state directly.\nA:H - This is exactly the reported crash — truncating the file makes filemap_unaccount_folio() hit VM_BUG_ON_FOLIO(folio_mapped(folio)) and panic the kernel; on non-DEBUG_VM builds it produces \"BUG: Bad page cache\"/bad-page-state taints and freelist corruption that destabilizes the whole system."
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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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"net/ipv4/tcp.c"
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],
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"versions": [
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{
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"version": "93ab6cc69162775201587cc9da00d5016dc890e2",
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"lessThan": "f48bf9a83b1666d934247cb58a9887d7b3127b6f",
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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": "93ab6cc69162775201587cc9da00d5016dc890e2",
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"lessThan": "718f446e60316bf606946f7f42367d691d21541e",
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"status": "affected",
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},
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{
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"version": "93ab6cc69162775201587cc9da00d5016dc890e2",
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"lessThan": "b383d4ea272fe5795877506dcce5aad1f6330e5e",
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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": "93ab6cc69162775201587cc9da00d5016dc890e2",
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"lessThan": "d15cc0f66884ef2bed28c7ccbb11c102aa3a0760",
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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": "93ab6cc69162775201587cc9da00d5016dc890e2",
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"lessThan": "1b8adcc0e2c584fec778add7777fe28e20781e60",
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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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"net/ipv4/tcp.c"
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],
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"versions": [
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{
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"version": "4.18",
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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": "4.18",
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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": "5.10.210",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.149",
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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": "6.1.77",
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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": "6.6.16",
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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": "6.7.4",
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"lessThanOrEqual": "6.7.*",
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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": "6.8",
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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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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.18",
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"references": [
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"url": "https://git.kernel.org/stable/c/f48bf9a83b1666d934247cb58a9887d7b3127b6f"
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},
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{
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"url": "https://git.kernel.org/stable/c/718f446e60316bf606946f7f42367d691d21541e"
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"url": "https://git.kernel.org/stable/c/b383d4ea272fe5795877506dcce5aad1f6330e5e"
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"url": "https://git.kernel.org/stable/c/577e4432f3ac810049cb7e6b71f4d96ec7c6e894"
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}
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],
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"title": "tcp: add sanity checks to rx zerocopy",
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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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"title": "CISA ADP Vulnrichment",
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"metrics": [
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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-2024-26640",
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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": "2024-03-18T14:20:07.780920Z"
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}
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}
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"shortName": "CISA-ADP",
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"dateUpdated": "2024-06-04T17:48:57.803Z"
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"dateUpdated": "2024-08-02T00:07:19.826Z"
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},
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"title": "CVE Program Container",
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"references": [
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