CVE-2026-45865

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45865", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.080Z", "datePublished": "2026-05-27T12:15:45.082Z", "dateUpdated": "2026-05-27T12:15:45.082Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-27T12:15:45.082Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp i2c: initialise event handler read bytes\n\nSet a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads\nwill return \"val\" from the i2c bus driver. For i2c-aspeed and\ni2c-npcm7xx that is a stack uninitialised u8.\n\nTested with \"i2ctransfer -y 1 r10@0x34\" where 0x34 is a mctp-i2c\ninstance, now it returns all 0xff."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/mctp/mctp-i2c.c"], "versions": [{"version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "lessThan": "93e01e837e105299f1c259ef71f6e1ec4fe806e3", "status": "affected", "versionType": "git"}, {"version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "lessThan": "11f83253244060b5de5eac787f61ae3f3e559d01", "status": "affected", "versionType": "git"}, {"version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "lessThan": "fa9861e5c8af7651dddfa8d490aaada17ae33b6c", "status": "affected", "versionType": "git"}, {"version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "lessThan": "6ff2ebfef75fbc57d937d8fbe738b967edf2d331", "status": "affected", "versionType": "git"}, {"version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "lessThan": "1eeedb310229bfee9dd4d992e5bba33fe1378a8f", "status": "affected", "versionType": "git"}, {"version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "lessThan": "2a14e91b6d76639dac70ea170f4384c1ee3cb48d", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/mctp/mctp-i2c.c"], "versions": [{"version": "5.18", "status": "affected"}, {"version": "0", "lessThan": "5.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.165", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.128", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.75", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.1.165"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.6.128"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.12.75"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.18.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "6.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3"}, {"url": "https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01"}, {"url": "https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c"}, {"url": "https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331"}, {"url": "https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f"}, {"url": "https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d"}], "title": "mctp i2c: initialise event handler read bytes", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/mctp/mctp-i2c.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "93e01e837e105299f1c259ef71f6e1ec4fe806e3", "status": "affected", "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "versionType": "git"}, {"lessThan": "11f83253244060b5de5eac787f61ae3f3e559d01", "status": "affected", "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "versionType": "git"}, {"lessThan": "fa9861e5c8af7651dddfa8d490aaada17ae33b6c", "status": "affected", "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "versionType": "git"}, {"lessThan": "6ff2ebfef75fbc57d937d8fbe738b967edf2d331", "status": "affected", "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "versionType": "git"}, {"lessThan": "1eeedb310229bfee9dd4d992e5bba33fe1378a8f", "status": "affected", "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "versionType": "git"}, {"lessThan": "2a14e91b6d76639dac70ea170f4384c1ee3cb48d", "status": "affected", "version": "f5b8abf9fc3dacd7529d363e26fe8230935d65f8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/mctp/mctp-i2c.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.18"}, {"lessThan": "5.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.165", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.128", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.75", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.14", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3B9A8D13-BEFF-47C0-956C-415602FDDAAF", "versionEndExcluding": "6.1.165", "versionStartIncluding": "5.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2", "versionEndExcluding": "6.6.128", "versionStartIncluding": "6.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2", "versionEndExcluding": "6.12.75", "versionStartIncluding": "6.7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "BF463CB7-1F58-4607-B847-77ED23E4B9B7", "versionEndExcluding": "6.18.14", "versionStartIncluding": "6.13", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092", "versionEndExcluding": "6.19.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp i2c: initialise event handler read bytes\n\nSet a 0xff value for i2c reads of an mctp-i2c device. Otherwise reads\nwill return \"val\" from the i2c bus driver. For i2c-aspeed and\ni2c-npcm7xx that is a stack uninitialised u8.\n\nTested with \"i2ctransfer -y 1 r10@0x34\" where 0x34 is a mctp-i2c\ninstance, now it returns all 0xff."}], "id": "CVE-2026-45865", "lastModified": "2026-06-25T21:07:04.690", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-05-27T14:16:58.787", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/11f83253244060b5de5eac787f61ae3f3e559d01"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1eeedb310229bfee9dd4d992e5bba33fe1378a8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2a14e91b6d76639dac70ea170f4384c1ee3cb48d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6ff2ebfef75fbc57d937d8fbe738b967edf2d331"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/93e01e837e105299f1c259ef71f6e1ec4fe806e3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fa9861e5c8af7651dddfa8d490aaada17ae33b6c"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: mctp i2c: initialise event handler read bytes", "id": "2481978", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2481978"}, "csaw": false, "cwe": "CWE-908", "details": ["A flaw was found in the Linux kernel's Message Control Transport Protocol (MCTP) over I2C (Inter-Integrated Circuit) implementation. A local attacker could exploit this vulnerability by performing I2C reads on an MCTP-I2C device. This could lead to the disclosure of uninitialized stack memory, potentially revealing sensitive information."], "name": "CVE-2026-45865", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45865\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45865\nhttps://lore.kernel.org/linux-cve-announce/2026052711-CVE-2026-45865-87b8@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f5b8abf9fc3dacd7529d363e26fe8230935d65f8,93e01e837e105299f1c259ef71f6e1ec4fe806e3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f5b8abf9fc3dacd7529d363e26fe8230935d65f8,11f83253244060b5de5eac787f61ae3f3e559d01)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f5b8abf9fc3dacd7529d363e26fe8230935d65f8,fa9861e5c8af7651dddfa8d490aaada17ae33b6c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f5b8abf9fc3dacd7529d363e26fe8230935d65f8,6ff2ebfef75fbc57d937d8fbe738b967edf2d331)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f5b8abf9fc3dacd7529d363e26fe8230935d65f8,1eeedb310229bfee9dd4d992e5bba33fe1378a8f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[f5b8abf9fc3dacd7529d363e26fe8230935d65f8,2a14e91b6d76639dac70ea170f4384c1ee3cb48d)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.165,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.128,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.75,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.14,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.4,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-05-27T16:15:05.692231+00:00", "updated": "2026-08-12T02:45:04.101839+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}