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-2026-74463",
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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": "2026-08-15T05:44:03.901Z",
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"datePublished": "2026-08-15T12:27:03.176Z",
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"dateUpdated": "2026-08-19T16:37:02.602Z"
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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": "2026-08-19T16:37:02.602Z"
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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\ni2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock\n\nFix a severe AB/BA deadlock between the Common Clock Framework (CCF)\nand the I2C adapter lock, which triggers when an I2C-controlled clock\ngenerator client (like the Si5351) is registered or modified under the CCF.\n\nDuring an i2c client clock (generator) frequency change, the CCF acquires its global\n'prepare_lock' mutex and the driver calls i2c_transfer() to update the client's\nchip registers, stalling for the adapter's I2C bus lock.\n\nConcurrently, an independent, parallel transfer on the same bus (e.g., a GPIO\nexpander handling LEDs) can hold the I2C adapter lock. Inside this parallel\ntransfer path, jz4780_i2c_set_speed() calls clk_get_rate() on the host\ncontroller's input clock to calculate bus timings. This call attempts to acquire\nthe blocked CCF 'prepare_lock', creating a circular dependency that freezes\nthe system.\n\nThe jz4780 host controller clock itself is static and never changes at runtime.\n\nHowever, calling clk_get_rate() inside the active transfer path introduces\nan unnecessary dependency on the CCF internal locks.\n\nEliminate this synchronous clk_get_rate() call from the active transfer\npath by caching the static host peripheral clock rate once - inside the private\njz4780_i2c structure during jz4780_i2c_probe(). Update jz4780_i2c_set_speed()\nto use this cached value, safely decoupling active I2C transactions from the\nCCF internal locks without any risk of stale timings.\n\nAssisted-by web based Google AI (pinpointing the bug and writing the message)."
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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/i2c/busses/i2c-jz4780.c"
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],
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"versions": [
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{
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"version": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "cc111696ef420f6bb552b2526530067977f0b406",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "f96a719d9f8a797105ec5cacf568ab128e33391f",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "deffad5bb4f8b4f09e46252f24754ddc9960b244",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "14429dc1c756c35e106f01ff09cadccb82f5531d",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "b6cb47e186abba85a3b08aa3023067ab82577286",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "19b783335d62e7a2367436a6e1f1b37da1878360",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "aa1944b52d6492c48bdd17046578aa0d953546e6",
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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": "ba92222ed63a12d09120df9b92f56cc990abac19",
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"lessThan": "d99607c888f26e8a4e9fe9772860cef4aff86bb4",
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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/i2c/busses/i2c-jz4780.c"
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],
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"versions": [
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{
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"version": "4.1",
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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": "4.1",
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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": "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": "6.6.151",
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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": "6.12.103",
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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": "6.18.44",
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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": "7.1.8",
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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": "4.1",
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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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"versionStartIncluding": "4.1",
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"versionEndExcluding": "5.15.216"
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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": "4.1",
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"versionEndExcluding": "6.1.183"
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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": "4.1",
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"versionEndExcluding": "6.6.151"
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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": "4.1",
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"versionEndExcluding": "6.12.103"
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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": "4.1",
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"versionEndExcluding": "6.18.44"
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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": "4.1",
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"versionEndExcluding": "7.1.8"
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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": "4.1",
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"versionEndExcluding": "7.2"
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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/cc111696ef420f6bb552b2526530067977f0b406"
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},
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{
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"url": "https://git.kernel.org/stable/c/f96a719d9f8a797105ec5cacf568ab128e33391f"
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},
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{
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"url": "https://git.kernel.org/stable/c/deffad5bb4f8b4f09e46252f24754ddc9960b244"
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},
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{
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"url": "https://git.kernel.org/stable/c/14429dc1c756c35e106f01ff09cadccb82f5531d"
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},
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{
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"url": "https://git.kernel.org/stable/c/b6cb47e186abba85a3b08aa3023067ab82577286"
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},
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{
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"url": "https://git.kernel.org/stable/c/19b783335d62e7a2367436a6e1f1b37da1878360"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa1944b52d6492c48bdd17046578aa0d953546e6"
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},
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{
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"url": "https://git.kernel.org/stable/c/d99607c888f26e8a4e9fe9772860cef4aff86bb4"
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}
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],
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"title": "i2c: jz4780: Cache host clock rate at probe to prevent CCF prepare_lock deadlock",
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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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}
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} |