302 lines
15 KiB
JSON
302 lines
15 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-2021-46998",
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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": "2024-02-27T18:42:55.950Z",
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"datePublished": "2024-02-28T08:13:21.651Z",
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"dateUpdated": "2026-08-05T08:45:27.902Z"
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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": "2026-08-05T08:45:27.902Z"
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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\nethernet:enic: Fix a use after free bug in enic_hard_start_xmit\n\nIn enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside\nenic_queue_wq_skb, if some error happens, the skb will be freed\nby dev_kfree_skb(skb). But the freed skb is still used in\nskb_tx_timestamp(skb).\n\nMy patch makes enic_queue_wq_skb() return error and goto spin_unlock()\nincase of error. The solution is provided by Govind.\nSee https://lkml.org/lkml/2021/4/30/961."
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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 UAF is in enic ndo_start_xmit (enic_hard_start_xmit → enic_queue_wq_skb → skb_tx_timestamp), reached when a local process transmits via ordinary socket send over an enic netdev; remote peers do not enter this TX-prepare path.\nAC:L - Once DMA mapping fails, the free-then-skb_tx_timestamp UAF is deterministic with no race; a local attacker can induce mapping failure by exhausting swiotlb/IOMMU resources, which is within attacker influence.\nPR:L - Any unprivileged local user can send packets out an up enic interface through the generic networking stack; no CAP_NET_ADMIN or other capability is required on the transmit path.\nUI:N - The attacker triggers the TX path and resource exhaustion themselves via their own send syscalls; no victim action is required.\nS:U - This is a standard in-kernel skb heap UAF enabling local privilege escalation within the same kernel security authority, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Use-after-free of the skb (skb_shinfo/tx_flags access, and skb_tstamp_tx when SKBTX_SW_TSTAMP is set) allows heap spraying and reuse of the freed object, enabling arbitrary kernel memory disclosure primitives.\nI:H - The same skb UAF enables heap corruption and write/control-flow hijack primitives after reclaim, per UAF exploitation guidance.\nA:H - Accessing the freed skb in skb_tx_timestamp reliably causes kernel oops/panic even without a full exploit."
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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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"drivers/net/ethernet/cisco/enic/enic_main.c"
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],
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"versions": [
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{
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"version": "fb7516d42478ebc8e2f00efb76ef96f7b68fd8d3",
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"lessThan": "25a87b1f566b5eb2af2857a928f0e2310d900976",
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"status": "affected",
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"versionType": "git"
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},
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"programFiles": [
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"drivers/net/ethernet/cisco/enic/enic_main.c"
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],
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"versions": [
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{
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"version": "4.16",
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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": "4.16",
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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": "4.19.191",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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},
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{
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"version": "5.4.120",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.38",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.11.22",
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"lessThanOrEqual": "5.11.*",
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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": "5.12.5",
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"lessThanOrEqual": "5.12.*",
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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": "5.13",
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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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"title": "ethernet:enic: Fix a use after free bug in enic_hard_start_xmit",
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"title": "CVE Program Container",
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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-2021-46998",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2024-09-10T16:00:51.946004Z"
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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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"shortName": "CISA-ADP",
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"dateUpdated": "2024-09-11T17:33:36.196Z"
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} |