{"cve":"CVE-2021-47023","nvd":{"published":"2024-02-28T09:15:39.197","modified":"2026-06-17T04:16:13.260","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: marvell: prestera: fix port event handling on init\n\nFor some reason there might be a crash during ports creation if port\nevents are handling at the same time  because fw may send initial\nport event with down state.\n\nThe crash points to cancel_delayed_work() which is called when port went\nis down.  Currently I did not find out the real cause of the issue, so\nfixed it by cancel port stats work only if previous port's state was up\n& runnig.\n\nThe following is the crash which can be triggered:\n\n[   28.311104] Unable to handle kernel paging request at virtual address\n000071775f776600\n[   28.319097] Mem abort info:\n[   28.321914]   ESR = 0x96000004\n[   28.324996]   EC = 0x25: DABT (current EL), IL = 32 bits\n[   28.330350]   SET = 0, FnV = 0\n[   28.333430]   EA = 0, S1PTW = 0\n[   28.336597] Data abort info:\n[   28.339499]   ISV = 0, ISS = 0x00000004\n[   28.343362]   CM = 0, WnR = 0\n[   28.346354] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000100bf7000\n[   28.352842] [000071775f776600] pgd=0000000000000000,\np4d=0000000000000000\n[   28.359695] Internal error: Oops: 96000004 [#1] PREEMPT SMP\n[   28.365310] Modules linked in: prestera_pci(+) prestera\nuio_pdrv_genirq\n[   28.372005] CPU: 0 PID: 1291 Comm: kworker/0:1H Not tainted\n5.11.0-rc4 #1\n[   28.378846] Hardware name: DNI AmazonGo1 A7040 board (DT)\n[   28.384283] Workqueue: prestera_fw_wq prestera_fw_evt_work_fn\n[prestera_pci]\n[   28.391413] pstate: 60000085 (nZCv daIf -PAN -UAO -TCO BTYPE=--)\n[   28.397468] pc : get_work_pool+0x48/0x60\n[   28.401442] lr : try_to_grab_pending+0x6c/0x1b0\n[   28.406018] sp : ffff80001391bc60\n[   28.409358] x29: ffff80001391bc60 x28: 0000000000000000\n[   28.414725] x27: ffff000104fc8b40 x26: ffff80001127de88\n[   28.420089] x25: 0000000000000000 x24: ffff000106119760\n[   28.425452] x23: ffff00010775dd60 x22: ffff00010567e000\n[   28.430814] x21: 0000000000000000 x20: ffff80001391bcb0\n[   28.436175] x19: ffff00010775deb8 x18: 00000000000000c0\n[   28.441537] x17: 0000000000000000 x16: 000000008d9b0e88\n[   28.446898] x15: 0000000000000001 x14: 00000000000002ba\n[   28.452261] x13: 80a3002c00000002 x12: 00000000000005f4\n[   28.457622] x11: 0000000000000030 x10: 000000000000000c\n[   28.462985] x9 : 000000000000000c x8 : 0000000000000030\n[   28.468346] x7 : ffff800014400000 x6 : ffff000106119758\n[   28.473708] x5 : 0000000000000003 x4 : ffff00010775dc60\n[   28.479068] x3 : 0000000000000000 x2 : 0000000000000060\n[   28.484429] x1 : 000071775f776600 x0 : ffff00010775deb8\n[   28.489791] Call trace:\n[   28.492259]  get_work_pool+0x48/0x60\n[   28.495874]  cancel_delayed_work+0x38/0xb0\n[   28.500011]  prestera_port_handle_event+0x90/0xa0 [prestera]\n[   28.505743]  prestera_evt_recv+0x98/0xe0 [prestera]\n[   28.510683]  prestera_fw_evt_work_fn+0x180/0x228 [prestera_pci]\n[   28.516660]  process_one_work+0x1e8/0x360\n[   28.520710]  worker_thread+0x44/0x480\n[   28.524412]  kthread+0x154/0x160\n[   28.527670]  ret_from_fork+0x10/0x38\n[   28.531290] Code: a8c17bfd d50323bf d65f03c0 9278dc21 (f9400020)\n[   28.537429] ---[ end trace 5eced933df3a080b ]---","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","score":8.2},"cwes":["CWE-400"],"references":["https://git.kernel.org/stable/c/0ce6052802be2cb61a57b753e41301339c88c839","https://git.kernel.org/stable/c/333980481b99edb24ebd5d1a53af70a15d9146de","https://git.kernel.org/stable/c/9d1ba11fabdd8f25abb24272ef1621417981320b","https://git.kernel.org/stable/c/b5bba6ede42693f50ce1c9944315cefed7491061","https://git.kernel.org/stable/c/0ce6052802be2cb61a57b753e41301339c88c839"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:45:59.823092188+00:00"},"epss":{"cve":"CVE-2021-47023","score":0.0084,"percentile":0.57867,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}