268 lines
14 KiB
JSON
268 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-2026-52981",
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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": "2026-06-09T07:44:35.376Z",
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"datePublished": "2026-06-24T16:28:57.074Z",
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"dateUpdated": "2026-10-19T19:47:11.784Z"
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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": "2026-08-05T12:32:19.237Z"
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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\nneigh: let neigh_xmit take skb ownership\n\nneigh_xmit always releases the skb, except when no neighbour table is\nfound. But even the first added user of neigh_xmit (mpls) relied on\nneigh_xmit to release the skb (or queue it for tx).\n\nsashiko reported:\n If neigh_xmit() is called with an uninitialized neighbor table (for\n example, NEIGH_ND_TABLE when IPv6 is disabled), it returns -EAFNOSUPPORT\n and bypasses its internal out_kfree_skb error path. Because the return\n value of neigh_xmit() is ignored here, does this leak the SKB?\n\nAssume full ownership and remove the last code path that doesn't\nxmit or free skb."
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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 - An unauthenticated packet sender can trigger the vulnerable `neigh_xmit()` path through configured network forwarding paths such as nftables netdev forwarding or MPLS forwarding. In the highest reasonable deployment, this is an exposed router/firewall datapath reachable by network traffic.\nAC:L - The bug is deterministic once the forwarding path uses a real neighbor table whose pointer is NULL, such as `NEIGH_ND_TABLE` when IPv6 neighbor discovery is unavailable. No race or heap shaping is required; repeated matching packets repeatedly leak skbs.\nPR:N - The attacker does not need privileges to send packets into an already configured vulnerable forwarding datapath. Although installing such rules/routes requires administrative network privileges, the packet-triggering attack itself is unauthenticated.\nUI:N - No victim user action is required after the affected forwarding configuration exists. The attacker only sends traffic that reaches the vulnerable path.\nS:U - The impact remains within the kernel/networking security authority of the affected system. There is no VM escape, sandbox boundary crossing, or separate security scope involved.\nC:N - The flaw is an skb memory leak caused by failing to free the packet buffer on the missing-table error path. It does not expose leaked memory contents to the attacker.\nI:N - The bug does not provide a memory corruption or data modification primitive. It only loses ownership of allocated skbs.\nA:H - An attacker can repeatedly trigger the leak with packets, consuming kernel memory and plausibly causing OOM, hangs, packet processing failure, or system-wide denial of service. Kernel memory exhaustion is a 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/core/neighbour.c"
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],
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"versions": [
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{
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"version": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
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"lessThan": "8a89054a1ec0767aec25ed2bbac933da6ba3cf5a",
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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": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
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"lessThan": "9247d59ca15bf60a57dca08103f055d8a4340877",
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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": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
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"lessThan": "0084712e0bee204b284510cdb63182fd5a30c2b7",
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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": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
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"lessThan": "63063ba60d2dc334e34f1e3f9271d7f3f6f30307",
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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": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
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"lessThan": "445e45a2c3a078316a62d2d331a570cf34ef5079",
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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": "4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62",
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"lessThan": "4438113be604ee67a7bf4f81da6e1cca41332ce4",
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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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"net/core/neighbour.c"
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],
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"versions": [
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{
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"version": "4.1",
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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": "4.1",
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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": "6.1.175",
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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": "6.6.141",
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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": "6.12.91",
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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": "6.18.33",
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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": "7.0.10",
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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": "4.1",
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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": "4.1",
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"versionEndExcluding": "6.6.141"
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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": "4.1",
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"versionEndExcluding": "6.12.91"
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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": "4.1",
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"versionEndExcluding": "6.18.33"
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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": "4.1",
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"versionEndExcluding": "7.0.10"
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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": "4.1",
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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/8a89054a1ec0767aec25ed2bbac933da6ba3cf5a"
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},
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{
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"url": "https://git.kernel.org/stable/c/9247d59ca15bf60a57dca08103f055d8a4340877"
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},
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{
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"url": "https://git.kernel.org/stable/c/0084712e0bee204b284510cdb63182fd5a30c2b7"
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},
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{
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"url": "https://git.kernel.org/stable/c/63063ba60d2dc334e34f1e3f9271d7f3f6f30307"
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},
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{
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"url": "https://git.kernel.org/stable/c/445e45a2c3a078316a62d2d331a570cf34ef5079"
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},
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{
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"url": "https://git.kernel.org/stable/c/4438113be604ee67a7bf4f81da6e1cca41332ce4"
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}
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],
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"title": "neigh: let neigh_xmit take skb ownership",
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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-2026-52981",
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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": "2026-10-16T15:23:55.989578Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-401",
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"description": "CWE-401 Missing Release of Memory after Effective Lifetime"
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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": "2026-10-19T19:47:11.784Z"
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}
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}
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]
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}
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} |