{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63995", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.026Z", "datePublished": "2026-07-19T14:56:14.580Z", "dateUpdated": "2026-07-20T13:42:10.891Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-07-20T13:42:10.891Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nethtool: cmis: validate start_cmd_payload_size from module\n\nThe CMIS firmware update code reads start_cmd_payload_size from\nthe module's FW Management Features CDB reply and uses it directly\nas the byte count for memcpy. The destination buffer is 112 bytes\n(ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious\nmodule (or corrupted response) can cause a OOB write later on in\ncmis_fw_update_start_download().\n\nLet's error out. If modules that expect longer LPL writes actually\nexist we should revisit.\n\nstruct cmis_cdb_start_fw_download_pl's definition has to move,\nno change there."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ethtool/cmis_fw_update.c"], "versions": [{"version": "c4f78134d45c9619339c96b4bea380b1d0699788", "lessThan": "63112b4515469d00008452d9cfe3fb3bf1aa2df3", "status": "affected", "versionType": "git"}, {"version": "c4f78134d45c9619339c96b4bea380b1d0699788", "lessThan": "0696709e951be54c699664adf546d16e28974d53", "status": "affected", "versionType": "git"}, {"version": "c4f78134d45c9619339c96b4bea380b1d0699788", "lessThan": "a46340da00385be7fb16c62425ebc20006f2d5d8", "status": "affected", "versionType": "git"}, {"version": "c4f78134d45c9619339c96b4bea380b1d0699788", "lessThan": "12c2496a71f82f63617971ca9b730dffa05cf58b", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ethtool/cmis_fw_update.c"], "versions": [{"version": "6.11", "status": "affected"}, {"version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.93", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.35", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.12", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "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": "6.11", "versionEndExcluding": "6.12.93"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.18.35"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/63112b4515469d00008452d9cfe3fb3bf1aa2df3"}, {"url": "https://git.kernel.org/stable/c/0696709e951be54c699664adf546d16e28974d53"}, {"url": "https://git.kernel.org/stable/c/a46340da00385be7fb16c62425ebc20006f2d5d8"}, {"url": "https://git.kernel.org/stable/c/12c2496a71f82f63617971ca9b730dffa05cf58b"}], "title": "ethtool: cmis: validate start_cmd_payload_size from module", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{}

{"bugzilla": {"description": "kernel: ethtool: cmis: validate start_cmd_payload_size from module", "id": "2502378", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502378"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nethtool: cmis: validate start_cmd_payload_size from module\nThe CMIS firmware update code reads start_cmd_payload_size from\nthe module's FW Management Features CDB reply and uses it directly\nas the byte count for memcpy. The destination buffer is 112 bytes\n(ETHTOOL_CMIS_CDB_LPL_MAX_PL_LENGTH - 8). So a malicious\nmodule (or corrupted response) can cause a OOB write later on in\ncmis_fw_update_start_download().\nLet's error out. If modules that expect longer LPL writes actually\nexist we should revisit.\nstruct cmis_cdb_start_fw_download_pl's definition has to move,\nno change there.", "A flaw was found in the Linux kernel's ethtool CMIS firmware update code. A malicious module or a corrupted response can provide an oversized payload size during the firmware update process. This can lead to an out-of-bounds write, allowing an attacker to corrupt memory. This memory corruption could potentially enable a local attacker to escalate privileges or execute arbitrary code within the kernel."], "name": "CVE-2026-63995", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63995\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63995\nhttps://lore.kernel.org/linux-cve-announce/2026071905-CVE-2026-63995-a31c@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4f78134d45c9619339c96b4bea380b1d0699788,63112b4515469d00008452d9cfe3fb3bf1aa2df3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4f78134d45c9619339c96b4bea380b1d0699788,0696709e951be54c699664adf546d16e28974d53)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4f78134d45c9619339c96b4bea380b1d0699788,a46340da00385be7fb16c62425ebc20006f2d5d8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c4f78134d45c9619339c96b4bea380b1d0699788,12c2496a71f82f63617971ca9b730dffa05cf58b)"}}], "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": "6.11"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.11)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.93,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.35,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.12,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "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": "2026-07-21T08:30:04.374640+00:00", "updated": "2026-07-22T18:15:03.251176+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-119", "CWE-787"]}