{“lastseen”:””,”description”:”In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: Fix rcu_tasks stall in threaded busypoll\\n\\nI was debugging a NIC driver when I noticed that when I enable\\nthreaded busypoll, bpftrace hangs when starting up. dmesg showed:\\n\\n rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 10658 jiffies old.\\n rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 40793 jiffies old.\\n rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 131273 jiffies old.\\n rcu_tasks_wait_gp: rcu_tasks grace period number 85 (since boot) is 402058 jiffies old.\\n INFO: rcu_tasks detected stalls on tasks:\\n 00000000769f52cd: .N nvcsw: 2\/2 holdout: 1 idle_cpu: -1\/64\\n task:napi\/eth2-8265 state:R running task stack:0 pid:48300 tgid:48300 ppid:2 task_flags:0x208040 flags:0x00004000\\n Call Trace:\\n \\u003cTASK\\u003e\\n ? napi_threaded_poll_loop+0x27c\/0x2c0\\n ? __pfx_napi_threaded_poll+0x10\/0x10\\n ? napi_threaded_poll+0x26\/0x80\\n ? kthread+0xfa\/0x240\\n ? __pfx_kthread+0x10\/0x10\\n ? ret_from_fork+0x31\/0x50\\n ? __pfx_kthread+0x10\/0x10\\n ? ret_from_fork_asm+0x1a\/0x30\\n \\u003c\/TASK\\u003e\\n\\nThe cause is that in threaded busypoll, the main loop is in\\nnapi_threaded_poll rather than napi_threaded_poll_loop, where the\\nlatter rarely iterates more than once within its loop. For\\nrcu_softirq_qs_periodic inside napi_threaded_poll_loop to report its\\nqs state, the last_qs must be 100ms behind, and this can’t happen\\nbecause napi_threaded_poll_loop rarely iterates in threaded busypoll,\\nand each time napi_threaded_poll_loop is called last_qs is reset to\\nlatest jiffies.\\n\\nThis patch changes so that in threaded busypoll, last_qs is saved\\nin the outer napi_threaded_poll, and whether busy_poll_last_qs\\nis NULL indicates whether napi_threaded_poll_loop is called for\\nbusypoll. This way last_qs would not reset to latest jiffies on\\neach invocation of napi_threaded_poll_loop.”,”published”:”2026-05-08T14:21:32.007Z”,”modified”:”2026-05-11T06:34:04.892Z”,”type”:”cve”,”title”:”net: Fix rcu_tasks stall in threaded busypoll”,”source”:”Linux”,”references”:”https:\/\/git.kernel.org\/stable\/c\/52459201d0df3fdbb1d281738b7b772e2cacb49c\\nhttps:\/\/git.kernel.org\/stable\/c\/1a86a1f7d88996085934139fa4c063b6299a2dd3″,”id”:”CVE-2026-43385″,”bulletinFamily”:””,”cwe”:null,”cvelist”:null,”sourceData”:”Linux Linux c18d4b190a46651726c9a952667c74d2deb33c28\\nLinux Linux c18d4b190a46651726c9a952667c74d2deb33c28\\nLinux Linux 6.19″,”sourceHref”:””,”cvss”:{“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”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:””,”category_name”:”CVE”,”post_link”:””,”product”:”Linux”,”version”:”c18d4b190a46651726c9a952667c74d2deb33c28″,”vendor”:”Linux”,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"
{“lastseen”:””,”description”:”In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: Fix rcu_tasks stall in threaded busypoll\\n\\nI was debugging a NIC driver when I noticed that…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,16,12,15,13,7,11,5],"class_list":["post-52899","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-75","tag-exploit","tag-high","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n