248 lines
13 KiB
JSON
248 lines
13 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-2026-31772",
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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": "2026-03-09T15:48:24.140Z",
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"datePublished": "2026-05-01T14:15:00.582Z",
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"dateUpdated": "2026-10-19T19:06:08.134Z"
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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": "2026-08-05T12:25:04.625Z"
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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\nBluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync\n\nhci_le_big_create_sync() uses DEFINE_FLEX to allocate a\nstruct hci_cp_le_big_create_sync on the stack with room for 0x11 (17)\nBIS entries. However, conn->num_bis can hold up to HCI_MAX_ISO_BIS (31)\nentries — validated against ISO_MAX_NUM_BIS (0x1f) in the caller\nhci_conn_big_create_sync(). When conn->num_bis is between 18 and 31,\nthe memcpy that copies conn->bis into cp->bis writes up to 14 bytes\npast the stack buffer, corrupting adjacent stack memory.\n\nThis is trivially reproducible: binding an ISO socket with\nbc_num_bis = ISO_MAX_NUM_BIS (31) and calling listen() will\neventually trigger hci_le_big_create_sync() from the HCI command\nsync worker, causing a KASAN-detectable stack-out-of-bounds write:\n\n BUG: KASAN: stack-out-of-bounds in hci_le_big_create_sync+0x256/0x3b0\n Write of size 31 at addr ffffc90000487b48 by task kworker/u9:0/71\n\nFix this by changing the DEFINE_FLEX count from the incorrect 0x11 to\nHCI_MAX_ISO_BIS, which matches the maximum number of BIS entries that\nconn->bis can actually carry."
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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 - The overflow is reached through locally created AF_BLUETOOTH ISO sockets via bind/listen or deferred receive; the Bluetooth BIG Info event only completes a userspace-initiated ISO sync path.\nAC:L - An attacker can choose a valid bc_num_bis value from 18 to 31 and valid BIS indexes, with no race or hard-to-control memory condition required.\nPR:L - Creating, binding, and listening on BTPROTO_ISO sockets does not require CAP_NET_ADMIN or other elevated capabilities, but it does require local code execution as an unprivileged user.\nUI:N - The attacker can trigger the vulnerable socket operations and resulting HCI sync worker path without any victim action.\nS:U - The corruption occurs within the kernel and affects the same operating-system security authority; ordinary kernel privilege escalation remains scope unchanged.\nC:H - This is kernel stack memory corruption from an out-of-bounds write, which can plausibly be leveraged to disclose sensitive kernel memory when exploited.\nI:H - The bug is a controlled out-of-bounds write past a stack buffer in kernel context, making high-integrity impact defensible.\nA:H - The issue is KASAN-reproducible as a stack out-of-bounds write in a kernel worker and can crash or destabilize the kernel."
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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/bluetooth/hci_sync.c"
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],
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"versions": [
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{
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"version": "91d19383b7ed035e22165ae5c836e50bb9f95fbe",
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"lessThan": "f5d446624345d309e7a4a1b27ea9f028d6a8c5d9",
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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": "42ecf1947135110ea08abeaca39741636f9a2285",
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"lessThan": "aba0aea354015794e8312dd7efe726967e58aefe",
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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": "42ecf1947135110ea08abeaca39741636f9a2285",
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"lessThan": "eaf32002ca7b1ba51c9f140991fd9febe6de79f0",
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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": "42ecf1947135110ea08abeaca39741636f9a2285",
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"lessThan": "bc39a094730ce062fa034a529c93147c096cb488",
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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": "8958e1cee4e2eac1a5b825caa4dd96ce9ed975dd",
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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": "6.12.2",
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"lessThan": "6.12.81",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.11.11",
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"lessThan": "6.12",
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"status": "affected",
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"versionType": "semver"
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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/bluetooth/hci_sync.c"
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],
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"versions": [
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{
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"version": "6.13",
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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": "6.13",
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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": "6.12.81",
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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": "6.18.22",
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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": "6.19.12",
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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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{
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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": "6.12.2",
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"versionEndExcluding": "6.12.81"
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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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"versionStartIncluding": "6.13",
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"versionEndExcluding": "6.18.22"
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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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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.13",
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"versionEndExcluding": "7.0"
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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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"versionStartIncluding": "6.11.11"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f5d446624345d309e7a4a1b27ea9f028d6a8c5d9"
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},
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{
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"url": "https://git.kernel.org/stable/c/aba0aea354015794e8312dd7efe726967e58aefe"
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},
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{
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"url": "https://git.kernel.org/stable/c/eaf32002ca7b1ba51c9f140991fd9febe6de79f0"
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},
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{
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"url": "https://git.kernel.org/stable/c/bc39a094730ce062fa034a529c93147c096cb488"
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}
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],
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"title": "Bluetooth: hci_sync: fix stack buffer overflow in hci_le_big_create_sync",
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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-2026-31772",
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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": "2026-10-16T15:13:07.170153Z"
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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-121",
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"description": "CWE-121 Stack-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": "2026-10-19T19:06:08.134Z"
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}
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}
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]
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}
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} |