{"api_version":"1","generated_at":"2026-08-22T18:18:27+00:00","cve":"CVE-2026-68129","urls":{"html":"https://cve.report/CVE-2026-68129","api":"https://cve.report/api/cve/CVE-2026-68129.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68129","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68129"},"summary":{"title":"gve: fix Rx queue stall on alloc failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ngve: fix Rx queue stall on alloc failure\n\nWhen the system is under extreme memory pressure, page allocations can\nfail during the Rx buffer refill loop. If the number of buffers posted\nto hardware falls below a critical low threshold and the refill loop\nexits due to allocation failures, the queue can stall:\n\n1. The device drops incoming packets because there are no descriptors.\n2. Since no packets are processed, no Rx completions are generated.\n3. Because no completions occur, NAPI is never scheduled, preventing\n   the refill loop from running again even after memory is freed.\n\nThis results in a permanent queue stall.\n\nResolve this by introducing a starvation recovery timer for each Rx queue.\nIf the number of buffers posted to hardware falls below a critical low\nthreshold, start a timer to periodically reschedule NAPI. Once NAPI runs\nand successfully refills the queue above the threshold, the timer is\nnot rescheduled.\n\nThe threshold is set to 32 because a single maximum-sized Receive Segment\nCoalescing (RSC) packet can consume up to 19 descriptors in the Rx path.\nLower thresholds (such as 8 or 16) would be insufficient to process a\ncomplete maximum-sized RSC packet, risking packet drops or unexpected\nhardware behavior under memory pressure. Setting the threshold to 32\nguarantees a safe margin to handle at least one full RSC packet.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:19:58","updated_at":"2026-08-19 17:20:30"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/42d525e751c61b876b2b0ae4e71ba7a8ab0c2777","name":"https://git.kernel.org/stable/c/42d525e751c61b876b2b0ae4e71ba7a8ab0c2777","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/689b9f588d2d7323dc66293fe594a68d030f400f","name":"https://git.kernel.org/stable/c/689b9f588d2d7323dc66293fe594a68d030f400f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b65352a1bac64442ad95e64f385b40ccb9f1b0db","name":"https://git.kernel.org/stable/c/b65352a1bac64442ad95e64f385b40ccb9f1b0db","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9db46e19e5d6bdcd4bf811284a5b0df1b984ef80","name":"https://git.kernel.org/stable/c/9db46e19e5d6bdcd4bf811284a5b0df1b984ef80","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/91e0249f3ef62b75fe8c9c9372eaba32876e4b3a","name":"https://git.kernel.org/stable/c/91e0249f3ef62b75fe8c9c9372eaba32876e4b3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0c317349b4baa5038d1fc373bf46d5a2419d1710","name":"https://git.kernel.org/stable/c/0c317349b4baa5038d1fc373bf46d5a2419d1710","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/299d5728a7312fdd02059b074aebbe4ebbd391e4","name":"https://git.kernel.org/stable/c/299d5728a7312fdd02059b074aebbe4ebbd391e4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68129","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68129","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b8dd5e5ea48bbb7532d20c4093a79d8283e4029 9db46e19e5d6bdcd4bf811284a5b0df1b984ef80 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b8dd5e5ea48bbb7532d20c4093a79d8283e4029 42d525e751c61b876b2b0ae4e71ba7a8ab0c2777 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b8dd5e5ea48bbb7532d20c4093a79d8283e4029 299d5728a7312fdd02059b074aebbe4ebbd391e4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9b8dd5e5ea48bbb7532d20c4093a79d8283e4029 0c317349b4baa5038d1fc373bf46d5a2419d1710 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68129","cve":"CVE-2026-68129","epss":"0.004660000","percentile":"0.386160000","score_date":"2026-08-19","updated_at":"2026-08-20 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the Linux kernel, the following vulnerability has been resolved:\n\ngve: fix Rx queue stall on alloc failure\n\nWhen the system is under extreme memory pressure, page allocations can\nfail during the Rx buffer refill loop. If the number of buffers posted\nto hardware falls below a critical low threshold and the refill loop\nexits due to allocation failures, the queue can stall:\n\n1. The device drops incoming packets because there are no descriptors.\n2. Since no packets are processed, no Rx completions are generated.\n3. Because no completions occur, NAPI is never scheduled, preventing\n   the refill loop from running again even after memory is freed.\n\nThis results in a permanent queue stall.\n\nResolve this by introducing a starvation recovery timer for each Rx queue.\nIf the number of buffers posted to hardware falls below a critical low\nthreshold, start a timer to periodically reschedule NAPI. Once NAPI runs\nand successfully refills the queue above the threshold, the timer is\nnot rescheduled.\n\nThe threshold is set to 32 because a single maximum-sized Receive Segment\nCoalescing (RSC) packet can consume up to 19 descriptors in the Rx path.\nLower thresholds (such as 8 or 16) would be insufficient to process a\ncomplete maximum-sized RSC packet, risking packet drops or unexpected\nhardware behavior under memory pressure. Setting the threshold to 32\nguarantees a safe margin to handle at least one full RSC packet."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - The flaw is in the gVNIC receive/refill path driven by incoming network traffic on internet-facing Google Cloud VMs; remote packets trigger NAPI polling that reaches gve_rx_post_buffers_dqo() where the stall occurs.\nAC:L - An attacker can reliably drive the vulnerable refill loop by sending high-volume traffic to exhaust RX page-pool buffers and pressure GFP_ATOMIC allocations; no race or rare layout is required beyond sustained network load.\nPR:N - Exploitation requires only the ability to send packets to the VM's gVNIC interface; no local account, capabilities, or authentication is needed on internet-reachable cloud instances.\nUI:N - No victim interaction is required; the permanent RX queue stall is triggered automatically during kernel packet receive processing under memory pressure.\nS:U - Impact is confined to the affected guest's network stack and does not cross VM, container, or IOMMU security boundaries; it is a guest-local denial of service, not an escape.\nC:N - This is a resource-management logic bug causing queue starvation with no out-of-bounds access, use-after-free, or information disclosure; no kernel or user memory is read by the attacker.\nI:N - The bug causes a permanent receive-queue stall without modifying kernel data structures, user data, or enabling code execution; there is no integrity impact beyond loss of connectivity.\nA:H - A failed refill below the 32-descriptor threshold permanently stalls the RX queue because no completions schedule NAPI again, causing lasting loss of network receive capability until reboot."}]}],"providerMetadata":{"dateUpdated":"2026-08-19T16:29:44.226Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/9db46e19e5d6bdcd4bf811284a5b0df1b984ef80"},{"url":"https://git.kernel.org/stable/c/42d525e751c61b876b2b0ae4e71ba7a8ab0c2777"},{"url":"https://git.kernel.org/stable/c/299d5728a7312fdd02059b074aebbe4ebbd391e4"},{"url":"https://git.kernel.org/stable/c/0c317349b4baa5038d1fc373bf46d5a2419d1710"},{"url":"https://git.kernel.org/stable/c/91e0249f3ef62b75fe8c9c9372eaba32876e4b3a"},{"url":"https://git.kernel.org/stable/c/689b9f588d2d7323dc66293fe594a68d030f400f"},{"url":"https://git.kernel.org/stable/c/b65352a1bac64442ad95e64f385b40ccb9f1b0db"}],"title":"gve: fix Rx queue stall on alloc failure","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68129","datePublished":"2026-08-10T11:58:51.406Z","dateReserved":"2026-07-30T09:28:09.370Z","dateUpdated":"2026-08-19T16:29:44.226Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:19:58","lastModifiedDate":"2026-08-19 17:20:30","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68129","Ordinal":"1","Title":"gve: fix Rx queue stall on alloc failure","CVE":"CVE-2026-68129","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68129","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ngve: fix Rx queue stall on alloc failure\n\nWhen the system is under extreme memory pressure, page allocations can\nfail during the Rx buffer refill loop. If the number of buffers posted\nto hardware falls below a critical low threshold and the refill loop\nexits due to allocation failures, the queue can stall:\n\n1. The device drops incoming packets because there are no descriptors.\n2. Since no packets are processed, no Rx completions are generated.\n3. Because no completions occur, NAPI is never scheduled, preventing\n   the refill loop from running again even after memory is freed.\n\nThis results in a permanent queue stall.\n\nResolve this by introducing a starvation recovery timer for each Rx queue.\nIf the number of buffers posted to hardware falls below a critical low\nthreshold, start a timer to periodically reschedule NAPI. Once NAPI runs\nand successfully refills the queue above the threshold, the timer is\nnot rescheduled.\n\nThe threshold is set to 32 because a single maximum-sized Receive Segment\nCoalescing (RSC) packet can consume up to 19 descriptors in the Rx path.\nLower thresholds (such as 8 or 16) would be insufficient to process a\ncomplete maximum-sized RSC packet, risking packet drops or unexpected\nhardware behavior under memory pressure. Setting the threshold to 32\nguarantees a safe margin to handle at least one full RSC packet.","Type":"Description","Title":"gve: fix Rx queue stall on alloc failure"}]}}}