{"schema":"threatline.record/2","record":{"id":"CVE-2026-97603","aliases":[],"summary":"idpf: disable DIM work before freeing q_vectors","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nidpf: disable DIM work before freeing q_vectors\n\nidpf never drains the Tx/Rx DIM works before freeing the memory they\nlive in.  tx_dim and rx_dim are embedded in struct idpf_q_vector, they\nare queued from the NAPI poll via net_dim(), and idpf_vport_intr_rel()\nends with kfree(rsrc->q_vectors).  Nothing in the driver cancels them.\n\nidpf_tx_dim_work() and idpf_rx_dim_work() then run on freed memory:\nidpf_vport_intr_write_itr() writes the ITR register through\nq_vector->intr_reg.tx_itr / rx_itr, void __iomem pointers loaded out of\nthe freed q_vector.  No configuration is needed to get there --\nIDPF_ITR_IS_DYNAMIC() is defined as (itr_mode) and idpf_vport_alloc()\ninitialises both modes to IDPF_ITR_DYNAMIC.\n\nDraining after idpf_vport_intr_napi_dis_all() is not enough on its own.\nidpf_net_dim() is called from inside the\n\"if (napi_complete_done(napi, work_done))\" branch of the poll, and\nnapi_complete_done() has already cleared NAPIF_STATE_SCHED by then.\nnapi_disable_locked() waits only while (val & (NAPIF_STATE_SCHED |\nNAPIF_STATE_NPSVC)), so napi_disable() can return while the poll tail is\nstill queueing the work, and a plain cancel_work_sync() would be\nre-armed behind the drain.\n\nUse disable_work_sync(): schedule_work() on a work with a non-zero\ndisable count is dropped by clear_pending_if_disabled() before\n__queue_work() is reached.\n\nMove idpf_init_dim() to idpf_vport_intr_alloc() so the works are\ninitialised on every path that can reach the drain -- the three\n\"goto intr_deinit\" sites between idpf_vport_intr_init() and\nidpf_vport_intr_ena() get there without the enable side having run.\nNothing re-enables them: rsrc->q_vectors is freed on every exit from\nidpf_vport_open() and on every idpf_vport_stop(), so the count dies with\nthe object.\n\nIt is a race, not a deterministic failure -- net_dim() only schedules\nonce DIM_NEVENTS events have accumulated and the profile index changes.\nA KASAN ifup/ifdown loop under load is the way to see it.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97603","source_modified_at":"2026-10-19T09:10:07.248Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"c2d548cad1508d334517bcbd7cd5c915cc831fc0","lessThan":"7d64d4c6bb6bb63b6cdb7de133c3ec48333b27b5","status":"affected","versionType":"git"},{"version":"c2d548cad1508d334517bcbd7cd5c915cc831fc0","lessThan":"7e4312953788244d47074987d40d76702cf929f1","status":"affected","versionType":"git"},{"version":"c2d548cad1508d334517bcbd7cd5c915cc831fc0","lessThan":"cd7a1598645b6917a8676b7e2efe8d97ce68a952","status":"affected","versionType":"git"},{"version":"c2d548cad1508d334517bcbd7cd5c915cc831fc0","lessThan":"7dd4c829bac2916be98a3e34b41daaba7f42b4c4","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97603","source_modified_at":"2026-10-19T09:10:07.248Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.7","status":"affected"},{"version":"0","lessThan":"6.7","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97603","source_modified_at":"2026-10-19T09:10:07.248Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7d64d4c6bb6bb63b6cdb7de133c3ec48333b27b5","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97603","source_modified_at":"2026-10-19T09:10:07.248Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7e4312953788244d47074987d40d76702cf929f1","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97603","source_modified_at":"2026-10-19T09:10:07.248Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7dd4c829bac2916be98a3e34b41daaba7f42b4c4","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.09311,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:16.015Z","modified_at":"2026-10-19T09:10:07.248Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97603","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:10:07.248Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97603","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/7d64d4c6bb6bb63b6cdb7de133c3ec48333b27b5"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7e4312953788244d47074987d40d76702cf929f1"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/cd7a1598645b6917a8676b7e2efe8d97ce68a952"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7dd4c829bac2916be98a3e34b41daaba7f42b4c4"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:10:07.248Z","content_hash":"a813560732ebb1c409622a754973052edc682c45c3392dd3ceb2c0f6e3bf9c09"}}