172 lines
10 KiB
JSON
172 lines
10 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-2026-80615",
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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": "2026-08-26T14:34:25.774Z",
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"datePublished": "2026-08-28T06:48:36.315Z",
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"dateUpdated": "2026-10-16T19:26:30.819Z"
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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": "2026-08-29T06:21:24.054Z"
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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: dst_metadata: fix false-positive memcpy overflow in tun_dst_unclone\n\nkmalloc_flex() in metadata_dst_alloc() sets __counted_by for the\nstructure to the options_len, which is then initialized to zero.\nLater, we're initializing the structure by copying the tunnel info\ntogether with the options, and this triggers a warning for a potential\nmemcpy overflow, since the compiler estimates that the options can't\nfit into the structure, even though the memory for them is actually\nallocated.\n\n memcpy: detected buffer overflow: 104 byte write of buffer size 96\n WARNING: CPU: X PID: Y at lib/string_helpers.c:1036 __fortify_report\n skb_tunnel_info_unclone+0x179/0x190\n geneve_xmit+0x7fe/0xe00\n\nThe issue is triggered when built with clang and source fortification.\n\nFix that by doing the copy in two stages: first - the main data with\nthe options_len, then the options. This way the correct length should\nbe known at the time of the copy.\n\nIt would be better if the options_len never changed after allocation,\nbut the allocation code is a little separate from the initialization\nand it would be awkward and potentially dangerous to return a struct\nwith options_len set to a non-zero value from the metadata_dst_alloc().\n\nAnother option would be to use ip_tunnel_info_opts_set(), but it is\ndoing too many unnecessary operations for the use case here."
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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:L/I:N/A:H",
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"baseScore": 8.2,
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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 - The bug is reached from geneve_xmit/vxlan_xmit and OVS dev_fill_metadata_dst during overlay packet transmit; remote peers can inject Geneve/VXLAN UDP traffic with tunnel options that later traverse skb_tunnel_info_unclone() on cloud, Kubernetes, and OpenStack/OVN nodes.\nAC:L - On kernels built with CONFIG_FORTIFY_SOURCE and clang, a remote attacker can deterministically trigger the fortified memcpy check by sending Geneve/VXLAN packets carrying non-zero tunnel options that provoke PMTU handling or OVS egress-metadata cloning; no races or victim-specific memory layout are required.\nPR:N - Exploitation requires only that the target host already runs Geneve/VXLAN/OVS overlay netdevs, which is routine in data centers; remote overlay peers and unauthenticated senders whose packets are forwarded through these tunnels need no elevated privileges on the target system.\nUI:N - The fortify warning is triggered automatically during kernel packet transmit or OVS metadata handling with no action required from a local user or administrator beyond normal network operation on an overlay-enabled host.\nS:U - Impact is a kernel fortify WARN/BUG in the host networking stack during tunnel metadata cloning; it does not cross VM, container, or IOMMU security boundaries into another authority domain.\nC:L - No actual out-of-bounds read occurs because fortify halts the memcpy before any real overflow, but __fortify_report() emits a kernel warning and call trace that can disclose limited kernel text/layout information useful for further exploitation.\nI:N - This is a fortify false positive: metadata_dst_alloc() correctly sizes the destination via kmalloc_flex() and fortify aborts before the memcpy executes; there is no memory corruption, arbitrary write, or code-execution primitive.\nA:H - Triggering the fortify check calls __fortify_panic(), which issues WARN then BUG(), causing a kernel oops/panic and immediate denial of service on overlay hosts processing malicious Geneve/VXLAN tunnel-metadata traffic."
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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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"include/net/dst_metadata.h"
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],
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"versions": [
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{
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"version": "69050f8d6d075dc01af7a5f2f550a8067510366f",
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"lessThan": "7ce31739fe88a558370135db95bbeec1e7ddfc29",
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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": "69050f8d6d075dc01af7a5f2f550a8067510366f",
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"lessThan": "4c6d43db2a4d2cef3921e885cf34798f790d34ea",
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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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"include/net/dst_metadata.h"
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],
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"versions": [
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{
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"version": "7.0",
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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": "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": "7.1.5",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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": "7.0",
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"versionEndExcluding": "7.1.5"
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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": "7.0",
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"versionEndExcluding": "7.2"
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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/7ce31739fe88a558370135db95bbeec1e7ddfc29"
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},
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{
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"url": "https://git.kernel.org/stable/c/4c6d43db2a4d2cef3921e885cf34798f790d34ea"
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}
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],
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"title": "net: dst_metadata: fix false-positive memcpy overflow in tun_dst_unclone",
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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-2026-80615",
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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": "yes"
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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": "2026-10-16T19:18:51.546693Z"
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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": "2026-10-16T19:26:30.819Z"
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}
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} |