295 lines
15 KiB
JSON
295 lines
15 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-2026-43186",
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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": "2026-05-01T14:12:55.991Z",
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"datePublished": "2026-05-06T11:27:57.053Z",
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"dateUpdated": "2026-10-19T19:16:23.065Z"
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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": "2026-08-05T12:26:24.342Z"
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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\nipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()\n\nOn the receive path, __ioam6_fill_trace_data() uses trace->nodelen\nto decide how much data to write for each node. It trusts this field\nas-is from the incoming packet, with no consistency check against\ntrace->type (the 24-bit field that tells which data items are\npresent). A crafted packet can set nodelen=0 while setting type bits\n0-21, causing the function to write ~100 bytes past the allocated\nregion (into skb_shared_info), which corrupts adjacent heap memory\nand leads to a kernel panic.\n\nAdd a shared helper ioam6_trace_compute_nodelen() in ioam6.c to\nderive the expected nodelen from the type field, and use it:\n\n - in ioam6_iptunnel.c (send path, existing validation) to replace\n the open-coded computation;\n - in exthdrs.c (receive path, ipv6_hop_ioam) to drop packets whose\n nodelen is inconsistent with the type field, before any data is\n written.\n\nPer RFC 9197, bits 12-21 are each short (4-octet) fields, so they\nare included in IOAM6_MASK_SHORT_FIELDS (changed from 0xff100000 to\n0xff1ffc00)."
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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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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:N - The vulnerable code is reached while processing received IPv6 Hop-by-Hop IOAM options in the network stack. A remote packet sender can craft the IOAM trace header for an IOAM-enabled target.\nAC:L - Exploitation requires a malformed but straightforward IOAM Pre-allocated Trace option with inconsistent nodelen and type fields. There is no race or attacker-uncontrolled timing condition once IOAM is enabled on the target interface.\nPR:N - The packet processing path has no authentication or per-sender privilege check before calling the vulnerable fill routine. Although enabling IOAM and creating namespaces is administrative setup, a remote attacker against such a deployment needs no privileges.\nUI:N - No victim user action is needed. The vulnerable path runs automatically when the kernel receives and parses the crafted IPv6 packet.\nS:U - The corruption occurs inside the same kernel security authority that processes the packet. This is not a VM escape or other cross-scope boundary bypass.\nC:H - The bug is a kernel heap out-of-bounds write into adjacent skb memory, including skb_shared_info in the described case. Such memory corruption can be leveraged for kernel memory disclosure as part of exploitation.\nI:H - This is an out-of-bounds kernel heap write controlled by attacker-supplied packet fields and layout choices. Kernel heap corruption is defensibly exploitable for arbitrary modification or code execution.\nA:H - The fix commit states the corruption leads to a kernel panic, and malformed packets can be sent repeatedly. Kernel panic or crash is high availability impact."
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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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"include/net/ioam6.h",
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"net/ipv6/exthdrs.c",
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"net/ipv6/ioam6.c",
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"net/ipv6/ioam6_iptunnel.c"
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],
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"versions": [
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{
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"version": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "f4d9d4b8fd839719d564651671e24c62c545c23b",
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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": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "fb3c662fafebc5b9d74417ed1de8759f6bb72143",
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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": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "632d233cf2e64a46865ae2c064ae3c9df7c8864f",
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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": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "0591d6509c2ff13f09ea2998434aba0c0472e978",
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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": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "e90346a2f1e8917d5760a44a1f61c44e3b36d96b",
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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": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "ea3632aefc04205436868541638e26f4a74d5637",
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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": "9ee11f0fff205b4b3df9750bff5e94f97c71b6a0",
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"lessThan": "6db8b56eed62baacaf37486e83378a72635c04cc",
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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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"include/net/ioam6.h",
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"net/ipv6/exthdrs.c",
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"net/ipv6/ioam6.c",
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"net/ipv6/ioam6_iptunnel.c"
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],
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"versions": [
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{
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"version": "5.15",
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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": "5.15",
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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": "5.15.202",
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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": "6.1.165",
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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": "6.6.128",
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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": "6.12.75",
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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": "6.18.16",
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"lessThanOrEqual": "6.18.*",
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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": "6.19.6",
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"lessThanOrEqual": "6.19.*",
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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": "7.0",
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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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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15",
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"versionEndExcluding": "5.15.202"
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},
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f4d9d4b8fd839719d564651671e24c62c545c23b"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb3c662fafebc5b9d74417ed1de8759f6bb72143"
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"url": "https://git.kernel.org/stable/c/632d233cf2e64a46865ae2c064ae3c9df7c8864f"
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"url": "https://git.kernel.org/stable/c/0591d6509c2ff13f09ea2998434aba0c0472e978"
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},
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{
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"url": "https://git.kernel.org/stable/c/e90346a2f1e8917d5760a44a1f61c44e3b36d96b"
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},
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{
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"url": "https://git.kernel.org/stable/c/ea3632aefc04205436868541638e26f4a74d5637"
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},
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{
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"url": "https://git.kernel.org/stable/c/6db8b56eed62baacaf37486e83378a72635c04cc"
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}
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],
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"title": "ipv6: ioam: fix heap buffer overflow in __ioam6_fill_trace_data()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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{
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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-2026-43186",
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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": "yes"
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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": "2026-10-16T15:15:25.722836Z"
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}
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}
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}
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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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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-122",
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"description": "CWE-122 Heap-based Buffer Overflow"
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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": "2026-10-19T19:16:23.065Z"
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}
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}
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]
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}
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} |