{"id":"CVE-2026-97516","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw88: Add NULL check for chip->edcca_th in rtw_fw_adaptivity_result()\n\nIt was recently reported that rtw_fw_adaptivity_result()\nin fw.c dereferences rtwdev->chip…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw88: Add NULL check for chip->edcca_th in rtw_fw_adaptivity_result()\n\nIt was recently reported that rtw_fw_adaptivity_result()\nin fw.c dereferences rtwdev->chip…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-476"],"vendor":"Linux","product":"Linux","affected":["Linux >= fe7bc23a8c5eba8a49061c1d15d0a9d45ef18130 < a8cdb18ef80d67790d8611ba94ae3d81901c9e04","Linux >= fe7bc23a8c5eba8a49061c1d15d0a9d45ef18130 < 0b58a5ac9170a6f5e6425f8e1a4b3e1d9c2bf53d","Linux >= fe7bc23a8c5eba8a49061c1d15d0a9d45ef18130 < 6fa23cafaf30f4877e357f8eebcff00dff4aa9cb","Linux >= fe7bc23a8c5eba8a49061c1d15d0a9d45ef18130 < 1d1f250432cd8704c3c125168887f9724021c81a","Linux >= fe7bc23a8c5eba8a49061c1d15d0a9d45ef18130 < d5e6f353ce1e1c25b8458ea390ed09d2377412c5","Linux 5.16"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:18:00.840","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-97516","references":[{"url":"https://git.kernel.org/stable/c/0b58a5ac9170a6f5e6425f8e1a4b3e1d9c2bf53d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1d1f250432cd8704c3c125168887f9724021c81a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/6fa23cafaf30f4877e357f8eebcff00dff4aa9cb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a8cdb18ef80d67790d8611ba94ae3d81901c9e04","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d5e6f353ce1e1c25b8458ea390ed09d2377412c5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97516.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-97516"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2540546"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-97516"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-97516"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97516.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00156,"epssPercentile":0.04726,"cvssSource":"vendor","ingestedAt":"2026-09-24T16:47:15.859Z","slug":"CVE-2026-97516","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nwifi: rtw88: Add NULL check for chip->edcca_th in rtw_fw_adaptivity_result()\n\nIt was recently reported that rtw_fw_adaptivity_result()\nin fw.c dereferences rtwdev->chip->edcca_th without\na NULL check. The issue is that devices with the\n8821CE chip don't define edcca_th in their chip\ninfo. As a result, when rtw_fw_adaptivity_result()\ntries to dereference it, the kernel triggers an oops.\n\nAdd a NULL check for edcca_th before dereferencing\nit in rtw_fw_adaptivity_result() in fw.c. Placing\nthe check at the function entry avoids logging any\ngarbage values.\n\nThis change does not address the root cause for\nthis behavior, but it prevents the NULL dereference\nand the resulting oops while a more permanent solution\nis developed.\n\nTested on a 8822CE chip which defines edcca_th, so\nthis issue is not present on it, but it still uses\nthis driver and I can verify there are no regressions.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97516.json)","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":212551,"id":"CVE-2026-97516","ts":1790668210998,"field":"cvss","old":null,"new":"5.5"},{"seq":212550,"id":"CVE-2026-97516","ts":1790668210998,"field":"severity","old":"none","new":"medium"}]}