310 lines
16 KiB
JSON
310 lines
16 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-2026-68300",
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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": "2026-07-30T09:28:09.380Z",
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"datePublished": "2026-08-10T12:02:34.168Z",
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"dateUpdated": "2026-10-19T21:09:04.214Z"
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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": "2026-08-19T16:32:51.209Z"
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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\nsctp: auth: verify auth requirement when auth_chunk is NULL\n\nsctp_auth_chunk_verify() returns true unconditionally when\nchunk->auth_chunk is NULL, silently skipping authentication.\nThis is incorrect when:\n\n1. skb_clone() failed in the BH receive path, leaving auth_chunk\n NULL. In sctp_endpoint_bh_rcv() asoc is NULL for new\n connections, so the early sctp_auth_recv_cid() check cannot\n catch this.\n\n2. No AUTH chunk precedes COOKIE-ECHO, so skb_clone() is never\n called and auth_chunk remains NULL.\n\nFix by checking sctp_auth_recv_cid() when auth_chunk is NULL:\nif authentication is required, return false to drop the chunk;\notherwise continue normally."
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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 SCTP COOKIE-ECHO chunk processing in the kernel's SCTP state machine, reached directly from packets received on the network from any remote peer over an arbitrarily routed SCTP connection.\nAC:L - The attacker deterministically triggers the bypass by completing a normal INIT/INIT-ACK exchange with the AUTH extension advertised and then sending COOKIE-ECHO with no preceding AUTH chunk; no race, no memory-layout dependency, and every step is under the attacker's control.\nPR:N - This is the pre-authentication association-establishment path itself; the attacker needs no credentials, no shared SCTP-AUTH key, and no account, since the bug is precisely that the required authentication is skipped.\nUI:N - The listening SCTP endpoint processes the crafted COOKIE-ECHO automatically in the receive path; no action by any local user or administrator is needed.\nS:U - The bypass affects the SCTP association and the application relying on it within the same host security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - An unauthenticated peer is admitted as an apparently authenticated one, and because peer.auth_capable is set the SCTP_AUTH_NO_AUTH notification is suppressed so the application cannot detect it, giving the attacker full read access to all data the service sends on that association.\nI:H - The attacker can inject arbitrary SCTP data and control chunks into the service as a trusted, supposedly key-verified peer, and can use the dupcook restart path to update or replace an existing association's state without authentication.\nA:H - Authenticating COOKIE-ECHO is the RFC 4895 defense against unauthorized association restart; bypassing it lets an attacker reset/take over an established association, dropping its queued state and denying service to the legitimate peer, and lets unauthorized peers consume association and accept-queue resources on an endpoint meant to admit only key-holding peers."
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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/sctp/sm_statefuns.c"
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],
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"versions": [
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{
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"version": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "a129792b3aef15002746c13522781d92ed3522c3",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "5a022ac51ad83b4ce6c898f4b9eefc65bd26b247",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "6caf0e8590c0bf05a76b0d387726adf3a6f3725c",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "ec2e157fc9678a9bc411305a25aec3fd337d7efb",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "28c5fdce9dd955d2baf5e28987819b6d7cfaf646",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "18957373920caf5cdaf5cf32e5d1d7a99ca7700a",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "83f5031f2a6a49d696eb4cc0898345d12f9c6451",
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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": "bbd0d59809f923ea2b540cbd781b32110e249f6e",
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"lessThan": "8e04823c120b376ef7dab14b60ebf6823aa16c14",
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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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"net/sctp/sm_statefuns.c"
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],
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"versions": [
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{
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"version": "2.6.24",
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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": "2.6.24",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.148",
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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": "6.12.101",
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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": "6.18.42",
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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": "7.1.6",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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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"cpeMatch": [
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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": "2.6.24",
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"versionEndExcluding": "5.10.265"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/a129792b3aef15002746c13522781d92ed3522c3"
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},
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{
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"url": "https://git.kernel.org/stable/c/5a022ac51ad83b4ce6c898f4b9eefc65bd26b247"
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},
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{
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"url": "https://git.kernel.org/stable/c/6caf0e8590c0bf05a76b0d387726adf3a6f3725c"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec2e157fc9678a9bc411305a25aec3fd337d7efb"
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},
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{
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"url": "https://git.kernel.org/stable/c/28c5fdce9dd955d2baf5e28987819b6d7cfaf646"
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},
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{
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"url": "https://git.kernel.org/stable/c/18957373920caf5cdaf5cf32e5d1d7a99ca7700a"
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},
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{
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"url": "https://git.kernel.org/stable/c/83f5031f2a6a49d696eb4cc0898345d12f9c6451"
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},
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{
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"url": "https://git.kernel.org/stable/c/8e04823c120b376ef7dab14b60ebf6823aa16c14"
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}
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],
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"title": "sctp: auth: verify auth requirement when auth_chunk is NULL",
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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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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-68300",
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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": "2026-10-16T15:46:55.343274Z"
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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-287",
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"description": "CWE-287 Improper Authentication"
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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": "2026-10-19T21:09:04.214Z"
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}
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}
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]
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}
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} |