264 lines
14 KiB
JSON
264 lines
14 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-2026-64055",
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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": "2026-07-19T07:54:57.030Z",
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"datePublished": "2026-07-19T15:39:37.077Z",
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"dateUpdated": "2026-08-05T12:38:44.658Z"
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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": "2026-08-05T12:38:44.658Z"
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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: ethernet: cortina: Carry over frag counter\n\nThe gmac_rx() NAPI poll function assembles packets in an\nSKB from a ring buffer.\n\nIf the ring buffer gets completely emptied during a poll cycle,\nwe exit gmac_rx(), but the packet is not yet completely\nassembled in the SKB, yet the fragment counter frag_nr is\nreset to zero on the next invocation.\n\nSolve this by making the RX fragment counter a part of the\nport struct, and carry it over between invocations.\n\nReset the fragment counter only right after calling\nnapi_gro_frags(), on error (after calling napi_free_frags())\nor if stopping the port.\n\nReset it in some place where not strictly necessary just to\nemphasize what is going on.\n\nThis was found by Sashiko during normal patch review."
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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:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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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 - The bug is in the Cortina Gemini GMAC RX NAPI path (gmac_rx), which processes incoming Ethernet frames delivered by hardware DMA; a remote attacker on any routable network can send crafted multi-fragment frames to the device's NIC without local access.\nAC:L - An attacker controls frame size (jumbo frames exceeding the 2048-byte RX buffer fragment size) and traffic timing to drain the RX ring mid-packet across NAPI poll cycles, reliably reproducing the lost frag_nr condition without depending on uncontrollable system state.\nPR:N - Exploitation requires only the ability to send Ethernet frames to the target interface; no local account, kernel capability, or authentication on the victim system is needed.\nUI:N - Packet reception and NAPI processing are fully automatic; no victim user action such as mounting a filesystem or opening a file is required.\nS:U - The vulnerability corrupts kernel skb metadata in the network driver and affects only the kernel's own security domain; it does not cross a VM, container, or IOMMU boundary by itself.\nC:H - Resetting frag_nr to zero while rx_skb retains prior fragments causes skb_fill_page_desc to overwrite fragment slot 0, shrinks nr_frags while inflating skb->len, and can trigger out-of-bounds kernel reads when GRO and the network stack process the corrupted skb.\nI:H - The bug corrupts kernel heap skb fragment metadata (overwritten page descriptors, inconsistent nr_frags versus len), which is memory corruption in kernel structures that can be leveraged for arbitrary write or control-flow hijack primitives.\nA:H - Submitting a corrupted multi-fragment skb to napi_gro_frags and the upper network stack can cause kernel oops, BUG, or panic during fragment traversal, checksum, or GRO processing."
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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/cortina/gemini.c"
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],
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"versions": [
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{
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"version": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "df31e3b64455293df1ea89c7da7d5c9bfbcdd253",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "7af1fabdee744b7995fe01b30b77dfc397657cb5",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "78cf08b3be47c28f07008a76c932bad7cdffa9d8",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "7123cf481e21b54eb6adc4cb0d8dc2876aeaee41",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "c373b34877afea61c89e0dd2e38948c624249b9b",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "46806096f35b8d3dfa2f321ddd77f597edcdb85f",
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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": "4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88",
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"lessThan": "ebd8ec2b309e3a447851b456ccaf8fb39f3661e7",
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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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"drivers/net/ethernet/cortina/gemini.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": "5.10.258",
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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": "5.15.209",
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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": "6.1.175",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.142",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.92",
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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": "6.18.34",
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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": "7.0.11",
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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": "4.16",
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"versionEndExcluding": "5.10.258"
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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": "4.16",
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"versionEndExcluding": "5.15.209"
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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": "4.16",
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"versionEndExcluding": "6.1.175"
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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": "4.16",
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"versionEndExcluding": "6.6.142"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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"versionEndExcluding": "6.12.92"
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.16",
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"versionEndExcluding": "6.18.34"
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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": "4.16",
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"versionEndExcluding": "7.0.11"
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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": "4.16",
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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/df31e3b64455293df1ea89c7da7d5c9bfbcdd253"
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},
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{
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"url": "https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5"
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},
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{
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"url": "https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0"
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},
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{
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"url": "https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8"
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},
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{
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"url": "https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41"
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},
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{
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"url": "https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b"
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},
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{
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"url": "https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f"
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},
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{
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"url": "https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7"
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}
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],
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"title": "net: ethernet: cortina: Carry over frag counter",
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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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}
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} |