338 lines
17 KiB
JSON
338 lines
17 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-2026-46322",
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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": "2026-05-13T15:03:33.112Z",
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"datePublished": "2026-06-09T12:11:14.776Z",
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"dateUpdated": "2026-10-19T19:36:58.325Z"
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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": "2026-08-05T12:31:17.322Z"
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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\ntun: free page on build_skb failure in tun_xdp_one()\n\nWhen build_skb() fails in tun_xdp_one(), the function sets ret to\n-ENOMEM and jumps to the out label, which returns without freeing the\npage that vhost_net_build_xdp() allocated for the frame. As with the\nshort-frame rejection path, tun_sendmsg() discards the per-buffer error\nand still returns total_len, so vhost_tx_batch() takes the success path\nand never frees the page. Each build_skb() failure in a batch leaks one\npage-frag chunk.\n\nFree the page before taking the error path, matching the put_page() the\nother error exits of tun_xdp_one() already perform."
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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:N/UI:N/S:C/C:N/I:N/A:H",
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"baseScore": 7.1,
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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 bug is reached only through the TUN `sendmsg()` path with `TUN_MSG_PTR`, which in production is driven by host `vhost-net` processing virtio-net TX descriptors from a VM guest or a local process holding a TUN/vhost-net fd—not by the host parsing remote network packets.\nAC:L - An attacker can reliably trigger `build_skb()` failure by first pressuring the `sk_buff` slab (e.g., flooding virtio TX or other allocations) and then sending batched virtio TX frames; they control both the memory-pressure side and the batch submission side.\nPR:N - In the highest-impact scenario—a malicious tenant in a cloud/KVM guest with virtio-net and vhost-net—the attacker needs no host privileges; any guest process that can transmit on the virtio TX queue can drive this path.\nUI:N - Exploitation requires no victim interaction beyond normal VM networking; the guest attacker can trigger the leak programmatically without the host user performing any action.\nS:C - The leak consumes host kernel memory from a guest VM security context, crossing the VM/host boundary and impacting resources outside the attacker's guest security authority.\nC:N - This is a pure page reference leak with no out-of-bounds access, use-after-free, or attacker-readable disclosure; leaked pages remain in the kernel allocator and are not exposed to the attacker.\nI:N - No memory corruption, arbitrary write, or control-flow hijack occurs; the only defect is failing to `put_page()` on the `build_skb()` error path.\nA:H - Each failed `build_skb()` leaks a page-frag (~4 KiB), batches can hold up to 64 XDP buffers, and `tun_sendmsg()` masks per-buffer errors so leaks are unbounded and repeatable, enabling sustained host kernel memory exhaustion and OOM/DoS."
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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/tun.c"
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],
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"versions": [
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{
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"version": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "793385c154771603b8671dd8338927221e9d8d78",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "2638a9c1521905bb5c5d1e95c8fbc09f79148ed7",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "60d9c0d6cdde5420d6483c921b16fe5465eb5238",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "d16e38fac09a47bfcf98c1ad65a1bb53f94540f5",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "aa308e9dbb9acb17cacdbbce9e4504f69bac8385",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "4fefc6156a162a9f50035c12091a5e5130c82c6e",
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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": "043d222f93ab8c76b56a3b315cd8692e35affb6c",
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"lessThan": "aa8963fdce667a42fb7f0bdd2909fadcab02f9a8",
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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/tun.c"
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],
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"versions": [
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{
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"version": "4.20",
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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": "4.20",
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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": "5.10.259",
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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": "5.15.210",
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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": "6.1.176",
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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": "6.6.143",
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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": "6.12.93",
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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": "6.18.35",
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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": "7.0.12",
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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": "4.20",
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"versionEndExcluding": "5.10.259"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9"
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},
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{
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"url": "https://git.kernel.org/stable/c/793385c154771603b8671dd8338927221e9d8d78"
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},
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{
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"url": "https://git.kernel.org/stable/c/2638a9c1521905bb5c5d1e95c8fbc09f79148ed7"
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},
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{
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"url": "https://git.kernel.org/stable/c/60d9c0d6cdde5420d6483c921b16fe5465eb5238"
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},
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{
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"url": "https://git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385"
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},
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{
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"url": "https://git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6e"
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},
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{
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"url": "https://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8"
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}
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],
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"title": "tun: free page on build_skb failure in tun_xdp_one()",
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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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"x_adpType": "supplier",
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"providerMetadata": {
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"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
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"shortName": "siemens-SADP",
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"dateUpdated": "2026-10-15T01:21:37.036Z"
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},
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"affected": [
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{
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"vendor": "Siemens",
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"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
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"versions": [
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{
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"status": "affected",
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"version": "0",
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"lessThan": "*",
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"versionType": "custom"
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}
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],
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"defaultStatus": "unknown"
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}
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],
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"references": [
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{
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"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"
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}
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]
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},
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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-2026-46322",
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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": "2026-10-16T15:22:05.058396Z"
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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": "2026-10-19T19:36:58.325Z"
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}
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}
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]
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}
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} |