226 lines
12 KiB
JSON
226 lines
12 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-2026-63996",
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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": "2026-07-19T07:54:57.026Z",
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"datePublished": "2026-07-19T14:56:15.256Z",
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"dateUpdated": "2026-10-19T20:18:01.872Z"
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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": "2026-08-05T12:38:00.530Z"
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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\nethtool: cmis: require exact CDB reply length\n\nMalicious SFP module could respond with rpl_len longer than\nwhat cmis_cdb_process_reply() expected, leading to OOB writes.\nMalicious HW is a bit theoretical but some modules may just\nbe buggy and/or the reads may occasionally get corrupted,\nso let's protect the kernel.\n\nThe existing check protects from short replies. We need to\nprotect from long ones, too. All callers that pass a non-zero\nrpl_exp_len cast the reply payload to a fixed-layout struct\nand read fields at fixed offsets, with no version negotiation\nor short-reply handling:\n\n - cmis_cdb_validate_password()\n - cmis_cdb_module_features_get()\n - cmis_fw_update_fw_mng_features_get()\n\nso let's assume that responses longer than expected do not\nhave to be handled gracefully here. Add a warning message\nto make the debug easier in case my understanding is wrong...\n\nNote that page_data->length (argument of kmalloc) comes from\nlast arg to ethtool_cmis_page_init() which is rpl_exp_len.\n\nNote2 that AIs also like to point out overflows in args->req.payload\nitself (which is a fixed-size 120 B buffer, on the stack),\nbut callers should be reading structs defined by the standard,\nso protecting from requests for more data than max seem like\ndefensive programming."
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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 vulnerable code is reached only via the local ethtool genetlink firmware-flash path (ETHTOOL_MSG_MODULE_FW_FLASH_ACT), not from remote network input; a malicious transceiver supplies the malformed CDB reply once that local ioctl-like operation is invoked.\nAC:L - A malicious CMIS module can reliably set rpl_len up to 255 on CDB replies; no race or uncontrollable memory layout is required, and an attacker with CAP_NET_ADMIN can bring the netdev down and initiate flashing deterministically.\nPR:L - Triggering module firmware flash requires CAP_NET_ADMIN, which is enforced via GENL_UNS_ADMIN_PERM/netlink_ns_capable and is obtainable by unprivileged users inside a user namespace (unshare -Urn), not only by init-namespace root.\nUI:N - Exploitation does not require a separate victim user action beyond the attacker (or compromised local process with CAP_NET_ADMIN) issuing the ethtool module firmware-flash command; no interactive victim steps are needed.\nS:U - Impact is kernel stack corruption and potential privilege escalation or denial of service within the same kernel security boundary; this is not a VM escape, sandbox escape, or cross-authority boundary crossing.\nC:H - The out-of-bounds stack write corrupts adjacent kernel stack memory and can be leveraged for arbitrary kernel memory disclosure; related CMIS ethtool bugs in the same path have already caused demonstrable stack corruption.\nI:H - memcpy() can write up to 135 bytes past the 120-byte payload buffer on the kernel stack, enabling control-data corruption and potential arbitrary kernel code execution, not merely a bounded modification.\nA:H - Stack corruption in this CMIS firmware-flash workqueue path can trigger kernel oops/panic (as seen in the related CVE-2025-37791 stack-protector failure in the same call chain) or hang the affected system."
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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/ethtool/cmis_cdb.c"
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],
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"versions": [
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{
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"version": "a39c84d796254e6b1662ca0c46dbc313379e9291",
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"lessThan": "2f818cc98fd2c63a08239cb48995f6c3bfe9d9b3",
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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": "a39c84d796254e6b1662ca0c46dbc313379e9291",
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"lessThan": "4d42fb88ec61f2e98c33a9e3a2de371d5edbc6b1",
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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": "a39c84d796254e6b1662ca0c46dbc313379e9291",
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"lessThan": "eb5dcd740cd7fa27bc2caeff2d28ef28e93ff4d3",
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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": "a39c84d796254e6b1662ca0c46dbc313379e9291",
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"lessThan": "6c3f999a9d1338c6c89a9ff4549eafe72bc2e7b1",
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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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"net/ethtool/cmis_cdb.c"
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],
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"versions": [
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{
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"version": "6.11",
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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": "6.11",
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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": "6.12.93",
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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": "6.18.35",
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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": "7.0.12",
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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": "6.11",
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"versionEndExcluding": "6.12.93"
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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",
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"versionEndExcluding": "6.18.35"
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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",
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"versionEndExcluding": "7.0.12"
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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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"versionEndExcluding": "7.1"
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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/2f818cc98fd2c63a08239cb48995f6c3bfe9d9b3"
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},
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{
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"url": "https://git.kernel.org/stable/c/4d42fb88ec61f2e98c33a9e3a2de371d5edbc6b1"
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},
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{
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"url": "https://git.kernel.org/stable/c/eb5dcd740cd7fa27bc2caeff2d28ef28e93ff4d3"
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},
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{
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"url": "https://git.kernel.org/stable/c/6c3f999a9d1338c6c89a9ff4549eafe72bc2e7b1"
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}
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],
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"title": "ethtool: cmis: require exact CDB reply length",
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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-2026-63996",
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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": "2026-10-16T15:34:56.047648Z"
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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-787",
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"description": "CWE-787 Out-of-bounds Write"
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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": "2026-10-19T20:18:01.872Z"
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}
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}
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]
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}
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} |