159 lines
9.0 KiB
JSON
159 lines
9.0 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-2025-68341",
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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": "2025-12-16T14:48:05.298Z",
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"datePublished": "2025-12-23T13:58:26.749Z",
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"dateUpdated": "2026-08-05T12:10:57.506Z"
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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": "2026-08-05T12:10:57.506Z"
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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\nveth: reduce XDP no_direct return section to fix race\n\nAs explain in commit fa349e396e48 (\"veth: Fix race with AF_XDP exposing\nold or uninitialized descriptors\") for veth there is a chance after\nnapi_complete_done() that another CPU can manage start another NAPI\ninstance running veth_pool(). For NAPI this is correctly handled as the\nnapi_schedule_prep() check will prevent multiple instances from getting\nscheduled, but for the remaining code in veth_pool() this can run\nconcurrent with the newly started NAPI instance.\n\nThe problem/race is that xdp_clear_return_frame_no_direct() isn't\ndesigned to be nested.\n\nPrior to commit 401cb7dae813 (\"net: Reference bpf_redirect_info via\ntask_struct on PREEMPT_RT.\") the temporary BPF net context\nbpf_redirect_info was stored per CPU, where this wasn't an issue. Since\nthis commit the BPF context is stored in 'current' task_struct. When\nrunning veth in threaded-NAPI mode, then the kthread becomes the storage\narea. Now a race exists between two concurrent veth_pool() function calls\none exiting NAPI and one running new NAPI, both using the same BPF net\ncontext.\n\nRace is when another CPU gets within the xdp_set_return_frame_no_direct()\nsection before exiting veth_pool() calls the clear-function\nxdp_clear_return_frame_no_direct()."
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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 - Unauthenticated packets received by a physical NIC can be XDP-redirected through a veth into the vulnerable threaded-NAPI path; no local access is needed to supply or time those packets.\nAC:L - Once veth XDP and threaded NAPI are configured, an attacker can repeatedly create the completion/rescheduling race using sustained or paced packet traffic.\nPR:N - The XDP topology requires administrative setup, but subsequent packet processing has no authentication or capability check, and the remote attacker needs no privileges.\nUI:N - Packets automatically traverse NIC XDP, veth queuing, threaded NAPI polling, and page return without victim interaction.\nS:U - The resulting memory corruption affects the host kernel within its existing security authority and does not inherently cross a VM, IOMMU, or equivalent boundary.\nC:H - The premature flag clear permits concurrent lockless page-pool recycling, potentially duplicating or stale-reusing pages and causing UAF-class corruption capable of exposing arbitrary kernel memory.\nI:H - The page-pool corruption can hand out a page multiple times and enable attacker-influenced writes into reused memory, making arbitrary writes or control-flow compromise defensible.\nA:H - Production failures resembling use-after-free were reported, and corrupted or multiply reused page-pool pages can cause kernel faults, panic, or persistent packet-processing failure."
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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/veth.c"
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],
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"versions": [
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{
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"version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e",
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"lessThan": "c1ceabcb347d1b0f7e70a7384ec7eff3847b7628",
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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": "401cb7dae8130fd34eb84648e02ab4c506df7d5e",
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"lessThan": "d0bd018ad72a8a598ae709588934135017f8af52",
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"status": "affected",
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},
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{
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"lessThan": "a14602fcae17a3f1cb8a8521bedf31728f9e7e39",
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"status": "affected",
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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/veth.c"
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],
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"versions": [
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{
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"version": "6.11",
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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": "6.11",
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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": "6.12.61",
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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": "6.17.11",
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"lessThanOrEqual": "6.17.*",
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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",
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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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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.11",
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"versionEndExcluding": "6.12.61"
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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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]
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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/c1ceabcb347d1b0f7e70a7384ec7eff3847b7628"
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},
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{
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"url": "https://git.kernel.org/stable/c/d0bd018ad72a8a598ae709588934135017f8af52"
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},
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{
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"url": "https://git.kernel.org/stable/c/a14602fcae17a3f1cb8a8521bedf31728f9e7e39"
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}
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],
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"title": "veth: reduce XDP no_direct return section to fix race",
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