{"id":"CVE-2026-89549","revision":"c5d29c4dbbb84471b2f4dba5736604df","records":[{"revision":"c5d29c4dbbb84471b2f4dba5736604df","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89549","aliases":[],"title":"sunrpc: route to a populated pool in svc_pool_for_cpu()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: route to a populated pool in svc_pool_for_cpu()\n\nsvc_set_num_threads() spreads the requested threads evenly across the\nservice's pools (base = nrservs / sv_nrpools).  When a service runs\nfewer threads than it has pools -- e.g. an nfsd configured with fewer\nthreads than the host has NUMA nodes while running in \"pernode\" or\n\"percpu\" mode -- the trailing pools are left with no threads at all.\n\nsvc_xprt_enqueue() selects a pool from the CPU servicing the transport,\nqueues the transport on that pool's sp_xprts, and only wakes a thread\nfrom the same pool.  Each thread services exclusively its own pool, so a\ntransport that lands on a threadless pool is enqueued on sp_xprts and\nnever picked up: the connection hangs indefinitely.\n\nHave svc_pool_for_cpu() skip pools that currently have no threads,\nfalling back to the next populated pool.  This trades NUMA locality for\na guarantee that the work is actually serviced.  sp_nrthreads is only\nupdated under the service mutex; the lockless read here is a best-effort\nrouting hint, so annotate it with data_race().","state":0,"publishedAt":"2026-09-11T19:44:23.928+00:00","modifiedAt":"2026-10-19T08:48:42.059+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/svc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"9accc25e5af0bac8479f6054e674b2c593c45281\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"6f66d38e2a6c78d48723ea17ad86135ec80ca24b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"edb20e8c03aebacb409968c99d046f509c6c485a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"011479cf9a7657d4a3e7cc42a784ac63df594170\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"9d04d64ad192439835ed9884d767353061c3ed6f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"8f766d2d0b4dabf54f8b35812df2b4f481d13316\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"bfd241600a3b0db4fe43c859f1460d0a958d924a\",\n                            \"lessThan\": \"f6310491c4cdb88af73aa551ec9df1f10a90c709\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/svc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.19\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/9accc25e5af0bac8479f6054e674b2c593c45281","https://git.kernel.org/stable/c/6f66d38e2a6c78d48723ea17ad86135ec80ca24b","https://git.kernel.org/stable/c/d79d7b9e8acbb53e2d60f6b24afc13e2f15e691f","https://git.kernel.org/stable/c/edb20e8c03aebacb409968c99d046f509c6c485a","https://git.kernel.org/stable/c/011479cf9a7657d4a3e7cc42a784ac63df594170","https://git.kernel.org/stable/c/9d04d64ad192439835ed9884d767353061c3ed6f","https://git.kernel.org/stable/c/8f766d2d0b4dabf54f8b35812df2b4f481d13316","https://git.kernel.org/stable/c/f6310491c4cdb88af73aa551ec9df1f10a90c709"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89549","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89549","identifiers":["CVE-2026-89549"]},"retained":false,"historicalAffected":[]}],"coverage":[]}