{"id":"CVE-2026-80788","title":"nvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations\n\nWhen fuzzing the nvme target code, I tripped a kernel warning in\nnvmet_tcp_map_data() because t…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 8d01f0d0e96485e39ad89b859ef85e1dc3020465","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 7b6a54d4e7b0da423c2b53ed293fd36b16c0b19e","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < e7077e6c45423dd2bb7de7b5fc4b018a8e6c4741","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 86cc450022473c4a29b43a09f3ec22a9ef566dac","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < c509f20be1cabda3087810bb2d658d66b3f31f35","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 9c95f7e66c62ee6c6abedcf1c04311f430ff5833","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 7fd6da0f28932442b51658bac4ff55565ca9b377","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 9b770e40bc00381e5ebf53653de5776773415be3","Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 737a3b535247226f6e1a7988fd9d6e63e7d6fc71","Linux 5.0"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:43:40.496Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80788","references":[{"url":"https://git.kernel.org/stable/c/8d01f0d0e96485e39ad89b859ef85e1dc3020465"},{"url":"https://git.kernel.org/stable/c/7b6a54d4e7b0da423c2b53ed293fd36b16c0b19e"},{"url":"https://git.kernel.org/stable/c/e7077e6c45423dd2bb7de7b5fc4b018a8e6c4741"},{"url":"https://git.kernel.org/stable/c/86cc450022473c4a29b43a09f3ec22a9ef566dac"},{"url":"https://git.kernel.org/stable/c/c509f20be1cabda3087810bb2d658d66b3f31f35"},{"url":"https://git.kernel.org/stable/c/9c95f7e66c62ee6c6abedcf1c04311f430ff5833"},{"url":"https://git.kernel.org/stable/c/7fd6da0f28932442b51658bac4ff55565ca9b377"},{"url":"https://git.kernel.org/stable/c/9b770e40bc00381e5ebf53653de5776773415be3"},{"url":"https://git.kernel.org/stable/c/737a3b535247226f6e1a7988fd9d6e63e7d6fc71"}],"tags":["cve.org"],"epss":0.00195,"epssPercentile":0.08587,"ingestedAt":"2026-10-19T10:20:54.957Z","slug":"CVE-2026-80788","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: Do not WARN on remotely-controlled oversized SGL allocations\n\nWhen fuzzing the nvme target code, I tripped a kernel warning in\nnvmet_tcp_map_data() because the length passed into the allocator is\ncontrolled by the remote initiator.\n\nA remote initiator that sends a command with an SGL claiming a huge\nnumber, can create a scatterlist and iovec allocation of over 1 million\nentries, which causes the backing kmalloc call to exceed MAX_PAGE_ORDER\nand then the page allocator will trip on a WARN_ON_ONCE_GFP() message:\n\n  WARNING: mm/page_alloc.c:5280 __alloc_frozen_pages_noprof\n  Workqueue: nvmet_tcp_wq nvmet_tcp_io_work\n  ...\n  sgl_alloc_order\n  nvmet_tcp_map_data\n  nvmet_tcp_try_recv_pdu\n\nAs it's never good to trip a kernel warning remotely due to many systems\nhaving panic-on-warn enabled, let's silence it by just add GFP_NOWARN to\nthe allocation flags.\n\n## Affected\n\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 8d01f0d0e96485e39ad89b859ef85e1dc3020465`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 7b6a54d4e7b0da423c2b53ed293fd36b16c0b19e`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < e7077e6c45423dd2bb7de7b5fc4b018a8e6c4741`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 86cc450022473c4a29b43a09f3ec22a9ef566dac`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < c509f20be1cabda3087810bb2d658d66b3f31f35`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 9c95f7e66c62ee6c6abedcf1c04311f430ff5833`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 7fd6da0f28932442b51658bac4ff55565ca9b377`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 9b770e40bc00381e5ebf53653de5776773415be3`\n- `Linux >= 872d26a391da92ed8f0c0f5cb5fef428067b7f30 < 737a3b535247226f6e1a7988fd9d6e63e7d6fc71`\n- `Linux 5.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}