{"cve":"CVE-2021-47077","nvd":{"published":"2024-03-01T22:15:47.283","modified":"2026-06-17T04:16:24.450","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qedf: Add pointer checks in qedf_update_link_speed()\n\nThe following trace was observed:\n\n [   14.042059] Call Trace:\n [   14.042061]  <IRQ>\n [   14.042068]  qedf_link_update+0x144/0x1f0 [qedf]\n [   14.042117]  qed_link_update+0x5c/0x80 [qed]\n [   14.042135]  qed_mcp_handle_link_change+0x2d2/0x410 [qed]\n [   14.042155]  ? qed_set_ptt+0x70/0x80 [qed]\n [   14.042170]  ? qed_set_ptt+0x70/0x80 [qed]\n [   14.042186]  ? qed_rd+0x13/0x40 [qed]\n [   14.042205]  qed_mcp_handle_events+0x437/0x690 [qed]\n [   14.042221]  ? qed_set_ptt+0x70/0x80 [qed]\n [   14.042239]  qed_int_sp_dpc+0x3a6/0x3e0 [qed]\n [   14.042245]  tasklet_action_common.isra.14+0x5a/0x100\n [   14.042250]  __do_softirq+0xe4/0x2f8\n [   14.042253]  irq_exit+0xf7/0x100\n [   14.042255]  do_IRQ+0x7f/0xd0\n [   14.042257]  common_interrupt+0xf/0xf\n [   14.042259]  </IRQ>\n\nAPI qedf_link_update() is getting called from QED but by that time\nshost_data is not initialised. This results in a NULL pointer dereference\nwhen we try to dereference shost_data while updating supported_speeds.\n\nAdd a NULL pointer check before dereferencing shost_data.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/11014efcec378bb0050a6cf08eaf375e3693400a","https://git.kernel.org/stable/c/73578af92a0fae6609b955fcc9113e50e413c80f","https://git.kernel.org/stable/c/a6362a737572f66051deb7637f3f77ddf7a4402f","https://git.kernel.org/stable/c/11014efcec378bb0050a6cf08eaf375e3693400a","https://git.kernel.org/stable/c/73578af92a0fae6609b955fcc9113e50e413c80f"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:46:54.846886191+00:00"},"epss":{"cve":"CVE-2021-47077","score":0.00225,"percentile":0.13213,"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."]}