221 lines
11 KiB
JSON
221 lines
11 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-2021-47559",
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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": "2024-05-24T15:11:00.727Z",
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"datePublished": "2024-05-24T15:12:48.675Z",
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"dateUpdated": "2026-08-05T08:48:24.200Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:48:24.200Z"
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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/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()\n\nCoverity reports a possible NULL dereferencing problem:\n\nin smc_vlan_by_tcpsk():\n6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times).\n7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next.\n1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);\nCID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS)\n8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev.\n1624 if (is_vlan_dev(ndev)) {\n\nRemove the manual implementation and use netdev_walk_all_lower_dev() to\niterate over the lower devices. While on it remove an obsolete function\nparameter comment."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - smc_vlan_by_tcpsk() runs on the SMC server listen path (smc_listen_work → smc_listen_find_device) during the CLC handshake over TCP after a remote peer connects to an AF_SMC listener, matching other SMC listen-path remote scores.\nAC:L - A remote peer only needs to complete a TCP connect with the SMC option and send a CLC proposal; stacked netdev topologies (bond/VLAN) are the intended, common deployment this walker exists for, so the attacker can trigger the path at will.\nPR:N - The CLC handshake runs before any application authentication and SMC performs no peer credential checks, so an unauthenticated remote client needs no account or capability on the target.\nUI:N - smc_listen_work runs automatically on inbound SMC/TCP connections with no additional victim action required beyond an already-listening SMC service.\nS:U - A successful trigger only oopses the local host kernel within the same security authority and does not cross a VM, IOMMU, or other boundary.\nC:N - This is a pure NULL pointer dereference of the netdev_lower_get_next() return in is_vlan_dev(), with no out-of-bounds read, UAF, or other information-disclosure primitive.\nI:N - The fault is a straight NULL dereference crash with no write primitive, type confusion, or memory corruption that could alter kernel state or hijack control flow.\nA:H - Dereferencing the NULL net_device pointer in is_vlan_dev() causes a kernel oops/panic and can take down the system, which is High availability impact."
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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/smc/smc_core.c"
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],
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"versions": [
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{
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"version": "cb9d43f6775457cac75544bc4197f26ac2b6f294",
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"lessThan": "c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff",
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"defaultStatus": "affected",
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"programFiles": [
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"net/smc/smc_core.c"
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],
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"versions": [
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{
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"version": "4.18",
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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": "4.18",
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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": "5.10.83",
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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": "5.15.6",
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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": "5.16",
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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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"versionStartIncluding": "4.18",
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"versionEndExcluding": "5.10.83"
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"references": [
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"url": "https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1"
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}
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],
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"title": "net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()",
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