298 lines
16 KiB
JSON
298 lines
16 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-2026-74473",
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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": "2026-08-15T05:44:03.903Z",
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"datePublished": "2026-08-15T12:27:09.382Z",
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"dateUpdated": "2026-10-16T19:05:47.966Z"
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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": "2026-08-19T16:37:25.639Z"
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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\nvxlan: use pskb_network_may_pull() in route_shortcircuit()\n\nroute_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr))\n(or ipv6hdr), which checks if bytes are available starting from skb->data.\n\nHowever, in vxlan_xmit(), skb->data points to the MAC header, so\nskb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20)\nonly checks 20 bytes from skb->data (which is 14 bytes MAC header + 6 bytes of\nIP header), leaving the rest of the IP header potentially un-pulled in non-linear\nfrags. Subsequent dereferences of ip_hdr(skb)->daddr can read beyond the pulled\nlinear buffer length.\n\nFix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to\nthe length check to ensure the full network header is present in the linear buffer."
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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 - route_shortcircuit() runs in vxlan_xmit() during overlay transmit; remote packets forwarded or routed onto a VXLAN netdev with route-short-circuit enabled reach this path without local access, matching net-stack guidance for network-reachable packet processing on cloud/SDN nodes.\nAC:L - An attacker can reliably craft non-linear skbs (scatter/gather/frags and size boundaries) and aim traffic at a known router MAC in the VXLAN FDB; no race or uncontrollable memory layout is required beyond targeting an RSC-enabled deployment, which is the scored scenario.\nPR:N - Exploitation needs no credentials or capabilities on the victim when VXLAN RSC is already configured; a remote peer only has to send IPv4/IPv6 frames that traverse the tunnel transmit path, with no netlink setup or CAP_NET_ADMIN in the target namespace.\nUI:N - Triggering the bug requires only attacker-controlled network traffic through the overlay; no victim mount, file open, link click, or other interactive action is needed.\nS:U - Impact is confined to the kernel hosting the VXLAN endpoint (memory disclosure, packet-header corruption, or crash); it does not cross VM, container, or IOMMU security boundaries by itself.\nC:H - The faulty pskb_may_pull() check leaves the IP/IPv6 header in non-linear frags, so ip_hdr(skb)->daddr/ipv6 daddr is read past the linear head and can disclose adjacent kernel memory per OOB-read guidance.\nI:H - The out-of-bounds destination address feeds neigh_lookup() and may rewrite eth_hdr()->h_dest before encapsulation, giving attacker-influenced overlay forwarding and a memory-safety primitive in the transmit path.\nA:H - Dereferencing network-header fields beyond the pulled linear buffer can provoke kernel oops/panic on affected skb layouts, and OOB reads in xmit context are treated as high availability impact even when exploitation is not fully weaponized."
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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/vxlan/vxlan_core.c"
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],
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"versions": [
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{
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"version": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "c419af4924c1593500a40519730ed98575d04a3e",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "6bd0a3a1b5744166946f0c551a6665c3b46b05e4",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "214ba43faf106cb06cd3dd30999c5c809c868b53",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "42887be7c4cf283cce02cd0fb6411221167c8b6c",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "aa0d31376d574ac858a40078431a77127bf04ee4",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "ee799977d7941dbfb11049e17edd9eaf4f8820f7",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "4f3f96e771a20263635bb5e1307c112d613b4bbd",
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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": "e4f67addf158f98f8197e08974966b18480dc751",
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"lessThan": "26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb",
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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/vxlan/vxlan_core.c"
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],
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"versions": [
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{
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"version": "3.8",
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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": "3.8",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.151",
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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": "6.12.103",
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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": "6.18.44",
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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": "7.1.8",
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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": "3.8",
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"versionEndExcluding": "5.10.265"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/c419af4924c1593500a40519730ed98575d04a3e"
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},
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{
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"url": "https://git.kernel.org/stable/c/6bd0a3a1b5744166946f0c551a6665c3b46b05e4"
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},
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{
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"url": "https://git.kernel.org/stable/c/214ba43faf106cb06cd3dd30999c5c809c868b53"
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},
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{
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"url": "https://git.kernel.org/stable/c/42887be7c4cf283cce02cd0fb6411221167c8b6c"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa0d31376d574ac858a40078431a77127bf04ee4"
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},
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{
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"url": "https://git.kernel.org/stable/c/ee799977d7941dbfb11049e17edd9eaf4f8820f7"
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},
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{
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"url": "https://git.kernel.org/stable/c/4f3f96e771a20263635bb5e1307c112d613b4bbd"
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},
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{
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"url": "https://git.kernel.org/stable/c/26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb"
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}
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],
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"title": "vxlan: use pskb_network_may_pull() in route_shortcircuit()",
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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-2026-74473",
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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": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T18:57:24.199754Z"
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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": "2026-10-16T19:05:47.966Z"
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}
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}
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]
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}
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} |