{"id":"CVE-2026-90257","summary":"Bluetooth: virtio_bt: avoid OOB read of build info string","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: virtio_bt: avoid OOB read of build info string\n\nThe virtbt_setup_zephyr() sends the Zephyr vendor command 0xfc08 (Read\nBuild Information) and hands the response to bt_dev_info() and\nhci_set_fw_info() as a \"%s\" string starting at skb-\u003edata + 1, without\nchecking the length. A backend that answers with status only leaves that\npointer past the end of the received data, so the walk reads adjacent\nslab memory until it meets a NUL. Those bytes reach the kernel log and\nthe firmware-info debugfs file.\n\nTo fix this, print the string with a bounded \"%.*s\" limited to\nskb-\u003elen - 1. A short or unterminated response then prints as much as\narrived instead of failing setup.\n\nThis mirrors commit dd068ef04412 (\"Bluetooth: bpa10x: avoid OOB read of\nrevision string in bpa10x_setup()\"), which fixed the identical pattern.","modified":"2026-09-19T03:47:25.685631100Z","published":"2026-09-17T16:07:56.089Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90257.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0e388d805233a883a31271676eae6031dfc9e898"},{"type":"WEB","url":"https://git.kernel.org/stable/c/502adc06ba76dee19c292ae4a07d74d202fe734d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54e9387eb7546eaa6f600220599d55740956ffc3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/84ea9c99874804f5ca13f35bbc186ba93902f30f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be1e3df2c49c91b0a052c6563884e8d39bd768b2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d08c99abf06133a7829d46627e77e3315ca974d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90257.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90257"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"afd2daa26c7abd734d78bd274fc6c59a15e61063"},{"fixed":"fb445b3466a8d1c7a0b0d0676fb475e3ce22d94e"},{"fixed":"d08c99abf06133a7829d46627e77e3315ca974d2"},{"fixed":"0e388d805233a883a31271676eae6031dfc9e898"},{"fixed":"54e9387eb7546eaa6f600220599d55740956ffc3"},{"fixed":"be1e3df2c49c91b0a052c6563884e8d39bd768b2"},{"fixed":"84ea9c99874804f5ca13f35bbc186ba93902f30f"},{"fixed":"502adc06ba76dee19c292ae4a07d74d202fe734d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90257.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.13.0"},{"fixed":"5.15.221"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.188"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.157"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.52"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90257.json"}}],"schema_version":"1.9.0"}