241 lines
13 KiB
JSON
241 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-2026-43495",
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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": "2026-05-01T14:12:56.013Z",
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"datePublished": "2026-05-21T12:12:45.988Z",
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"dateUpdated": "2026-08-05T12:28:18.825Z"
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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": "2026-08-05T12:28:18.825Z"
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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\nnet: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler\n\nt7xx_port_enum_msg_handler() uses the modem-supplied port_count field as\na loop bound over port_msg->data[] without checking that the message buffer\ncontains sufficient data. A modem sending port_count=65535 in a 12-byte\nbuffer triggers a slab-out-of-bounds read of up to 262140 bytes.\n\nAdd a sizeof(*port_msg) check before accessing the port message header\nfields to guard against undersized messages.\n\nAdd a struct_size() check after extracting port_count and before the loop.\n\nIn t7xx_parse_host_rt_data(), guard the rt_feature header read with a\nremaining-buffer check before accessing data_len, validate feat_data_len\nagainst the actual remaining buffer to prevent OOB reads and signed\ninteger overflow on offset.\n\nPass msg_len from both call sites: skb->len at the DPMAIF path after\nskb_pull(), and the validated feat_data_len at the handshake path."
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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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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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:A - The vulnerable parser consumes control messages supplied by the cellular modem/baseband over PCIe; the realistic worst-case attacker is a rogue base station / over-the-air baseband compromise that pivots to the host kernel, which is the cellular-radio analog of WiFi/Bluetooth adjacency. It is not directly Network-reachable because these are internal AP↔modem control messages, not internet-routable packets.\nAC:L - A malicious/compromised modem reliably triggers the OOB read by setting port_count to a large value (up to 65535) in an undersized buffer; there is no race or attacker-uncontrollable precondition, and the ~256 KB read reliably reaches unmapped memory.\nPR:N - The modem's messages are parsed automatically during the handshake/port-enumeration with no authentication or privilege check on the device-supplied data, so the attacker needs no host-side credentials.\nUI:N - Port enumeration and runtime-feature handshake are processed automatically by kernel threads at modem init and runtime; no user action is required.\nS:U - The vulnerable code and the impacted resource are both the host kernel; there is no crossing into a different security authority such as a VM/hypervisor or IOMMU domain.\nC:H - The flaw is a large slab-out-of-bounds read of up to ~256 KB of adjacent kernel heap, and the read values steer channel enable/disable behavior, providing a disclosure oracle — well above a few bounded bytes.\nI:H - The out-of-bounds data is interpreted as port_info and drives kernel driver channel enable/disable state, modifying kernel-internal state based on attacker-influenced out-of-bounds memory; rounding up under uncertainty.\nA:H - An out-of-bounds read of up to ~256 KB past a 12-byte slab object reliably crosses into unmapped/poisoned pages, causing a kernel oops/panic (denial of service)."
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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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"drivers/net/wwan/t7xx/t7xx_modem_ops.c",
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"drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c",
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"drivers/net/wwan/t7xx/t7xx_port_proxy.h"
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],
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"versions": [
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{
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"version": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
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"lessThan": "307c5d0f36a5c74042217136da5bfbd9f7504650",
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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": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
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"lessThan": "f94450ce5053b36002995b72d1fa1db3bb08c5bf",
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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": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
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"lessThan": "9855e063e063158cc5bded576382599dc3133202",
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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": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
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"lessThan": "2b56d7903ab804481f5233a259d5f341e9fd513c",
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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": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
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"lessThan": "dd4f4c93c1488d7100b9964f2da4c8b3c29652f1",
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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": "da45d2566a1d4e260b894ff5d96be64b21c7fa79",
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"lessThan": "0e7c074cfcd9bd93765505f9eb8b42f03ed2a744",
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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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"drivers/net/wwan/t7xx/t7xx_modem_ops.c",
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"drivers/net/wwan/t7xx/t7xx_port_ctrl_msg.c",
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"drivers/net/wwan/t7xx/t7xx_port_proxy.h"
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],
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"versions": [
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{
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"version": "5.19",
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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": "5.19",
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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": "6.1.176",
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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": "6.6.140",
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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": "6.12.88",
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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": "6.18.30",
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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": "7.0.7",
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"lessThanOrEqual": "7.0.*",
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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",
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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": "5.19",
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"versionEndExcluding": "6.1.176"
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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": "5.19",
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"versionEndExcluding": "6.6.140"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.12.88"
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{
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"versionEndExcluding": "6.18.30"
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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": "5.19",
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"versionEndExcluding": "7.0.7"
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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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/307c5d0f36a5c74042217136da5bfbd9f7504650"
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},
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{
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"url": "https://git.kernel.org/stable/c/f94450ce5053b36002995b72d1fa1db3bb08c5bf"
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},
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{
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"url": "https://git.kernel.org/stable/c/9855e063e063158cc5bded576382599dc3133202"
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},
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{
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"url": "https://git.kernel.org/stable/c/2b56d7903ab804481f5233a259d5f341e9fd513c"
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},
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{
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"url": "https://git.kernel.org/stable/c/dd4f4c93c1488d7100b9964f2da4c8b3c29652f1"
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},
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{
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"url": "https://git.kernel.org/stable/c/0e7c074cfcd9bd93765505f9eb8b42f03ed2a744"
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}
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],
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"title": "net: wwan: t7xx: validate port_count against message length in t7xx_port_enum_msg_handler",
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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": "CVE Program Container",
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"references": [
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{
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"url": "http://www.openwall.com/lists/oss-security/2026/06/18/1"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2026-06-18T18:47:33.811Z"
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}
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}
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]
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}
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} |