{"id":"CVE-2026-43019","title":"Bluetooth: hci_conn: fix potential UAF in set_cig_params_sync","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it's poss…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a091289218202bc09d9b9caa8afcde1018584aec < 7502c1cf303b69f71d085f5ff7251b0e1b0f09df","Linux >= a091289218202bc09d9b9caa8afcde1018584aec < 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02","Linux >= a091289218202bc09d9b9caa8afcde1018584aec < 7d568fede8eac91161a60b710aa920abe9b0fb9f","Linux >= a091289218202bc09d9b9caa8afcde1018584aec < bad65b4b0a96139f023eadc28a33125963208449","Linux >= a091289218202bc09d9b9caa8afcde1018584aec < a2639a7f0f5bf7d73f337f8f077c19415c62ed2c","Linux 3a273cd0f47dd672d37736e623849374f9ab9ce9","Linux d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062","Linux >= 6.4.16 < 6.5","Linux >= 6.5.3 < 6.6","Linux 6.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:13:33.625290Z"},"published":"2026-05-01","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:28.210Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43019","references":[{"url":"https://git.kernel.org/stable/c/7502c1cf303b69f71d085f5ff7251b0e1b0f09df"},{"url":"https://git.kernel.org/stable/c/66d432e9b45bae7881ffcdb12cd8fd0bf254ef02"},{"url":"https://git.kernel.org/stable/c/7d568fede8eac91161a60b710aa920abe9b0fb9f"},{"url":"https://git.kernel.org/stable/c/bad65b4b0a96139f023eadc28a33125963208449"},{"url":"https://git.kernel.org/stable/c/a2639a7f0f5bf7d73f337f8f077c19415c62ed2c"}],"tags":["cve.org"],"epss":0.00175,"epssPercentile":0.06538,"ingestedAt":"2026-10-16T17:24:46.676Z","slug":"CVE-2026-43019","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_conn: fix potential UAF in set_cig_params_sync\n\nhci_conn lookup and field access must be covered by hdev lock in\nset_cig_params_sync, otherwise it's possible it is freed concurrently.\n\nTake hdev lock to prevent hci_conn from being deleted or modified\nconcurrently.  Just RCU lock is not suitable here, as we also want to\navoid \"tearing\" in the configuration.\n\n## Affected\n\n- `Linux >= a091289218202bc09d9b9caa8afcde1018584aec < 7502c1cf303b69f71d085f5ff7251b0e1b0f09df`\n- `Linux >= a091289218202bc09d9b9caa8afcde1018584aec < 66d432e9b45bae7881ffcdb12cd8fd0bf254ef02`\n- `Linux >= a091289218202bc09d9b9caa8afcde1018584aec < 7d568fede8eac91161a60b710aa920abe9b0fb9f`\n- `Linux >= a091289218202bc09d9b9caa8afcde1018584aec < bad65b4b0a96139f023eadc28a33125963208449`\n- `Linux >= a091289218202bc09d9b9caa8afcde1018584aec < a2639a7f0f5bf7d73f337f8f077c19415c62ed2c`\n- `Linux 3a273cd0f47dd672d37736e623849374f9ab9ce9`\n- `Linux d8570c4c3f2a3e51b3c8b5e6ec898364c5c03062`\n- `Linux >= 6.4.16 < 6.5`\n- `Linux >= 6.5.3 < 6.6`\n- `Linux 6.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}