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-2026-68376",
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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": "2026-07-30T09:28:09.386Z",
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"datePublished": "2026-08-10T12:03:54.666Z",
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"dateUpdated": "2026-10-19T21:09:06.621Z"
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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": "2026-08-19T16:34:35.759Z"
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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: fix auth_hmacs array size in struct sctp_cookie\n\nThe auth_hmacs array in struct sctp_cookie is supposed to store a complete\nSCTP_AUTH_HMAC_ALGO parameter, which consists of a struct sctp_paramhdr\nfollowed by N HMAC identifiers.\n\nHowever, the array size was calculated using an extra 2 bytes instead of\nsizeof(struct sctp_paramhdr), which is 4 bytes. When four HMAC identifiers\nare configured, the HMAC-ALGO parameter stored in the endpoint is larger\nthan the auth_hmacs buffer in the cookie.\n\nAs a result, sctp_association_init() copies beyond the end of auth_hmacs\nwhen initializing the association, corrupting the adjacent auth_chunks\nfield. This can lead to an invalid HMAC identifier being accepted and later\ncause an out-of-bounds read in sctp_auth_get_hmac().\n\nFix the array size calculation by including the full SCTP parameter header\nsize."
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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:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.1,
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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:N - The out-of-bounds index is taken directly from the `hmac_id` field of an AUTH chunk received from a remote SCTP peer and processed in sctp_sf_eat_auth()/sctp_sf_authenticate(), which is the normal SCTP packet-receive path in net/sctp.\nAC:H - The overflow only occurs when the victim endpoint was configured with exactly four HMAC identifiers via setsockopt(SCTP_HMAC_IDENT); three or fewer fit the buffer exactly. That local socket configuration is beyond a remote attacker's control, though a local user can arrange it and then attack over loopback.\nPR:N - Once the endpoint is so configured, any peer that completes an ordinary SCTP handshake can send the malformed AUTH chunk; the bogus hmac_id is accepted and dereferenced before any shared-key or HMAC verification, so no credentials of any kind are needed.\nUI:N - The AUTH chunk is consumed automatically by the kernel SCTP state machine on packet receipt; no action by any local user or administrator is needed at attack time.\nS:U - The corruption and the subsequent out-of-bounds accesses are confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - sctp_auth_get_hmac() reads far past the 4-entry sctp_hmac_list, and on kernels before the HMAC library conversion sctp_auth_calculate_hmac() reads a function-table pointer ~262 KB beyond the 4-pointer ep->auth_hmacs heap array; the accepted/rejected signature length acts as an oracle leaking the out-of-bounds value.\nI:H - The wild crypto_shash pointer fetched out of bounds is passed straight to crypto_shash_setkey()/crypto_shash_tfm_digest(), giving an attacker-groomable indirect call and write target; on current kernels a fixed 32-byte HMAC is written into a digest area sized from out-of-bounds data.\nA:H - Dereferencing an out-of-bounds heap pointer as a crypto transform, or writing a 32-byte digest into an undersized skb region, reliably oopses or panics the kernel, and the attack can be repeated on every association."
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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/sctp/structs.h"
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],
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"versions": [
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{
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"status": "affected",
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"version": "1f485649f52929d9937b346a920a522a7363e202",
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"status": "affected",
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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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"programFiles": [
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"include/net/sctp/structs.h"
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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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},
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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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},
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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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},
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{
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"version": "6.12.101",
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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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"cpeApplicability": [
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"url": "https://git.kernel.org/stable/c/0b4414e43e0861d67276031cc21401d7e87de3da"
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"url": "https://git.kernel.org/stable/c/a8d20ba0ab518c9ccbcde258f25fc1ee6e51d5db"
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{
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"url": "https://git.kernel.org/stable/c/e0b5252a59383b77d1b8dbeda00b7184dd95f4d3"
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}
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],
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"title": "sctp: fix auth_hmacs array size in struct sctp_cookie",
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"x_generator": {
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"engine": "bippy-1.2.0"
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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-2026-68376",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:47:35.941607Z"
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}
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}
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-787",
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"description": "CWE-787 Out-of-bounds Write"
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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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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T21:09:06.621Z"
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} |