{"id":"AZL-90917","summary":"CVE-2026-53254 affecting package kernel for versions less than 6.6.143.1-1","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: validate skb length in MCC handlers\n\nThe RFCOMM MCC handlers cast skb-\u003edata to protocol-specific structs\nwithout validating skb-\u003elen first. A malicious remote device can send\ntruncated MCC frames and trigger out-of-bounds reads in these handlers.\n\nFix this by using skb_pull_data() to validate and access the required\ndata before dereferencing it.\n\nrfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows\n1-byte RPN requests. Handle this by validating only the DLCI byte first,\nand validating the full struct only when len \u003e 1.","modified":"2026-08-28T17:48:11.951800455Z","published":"2026-06-25T09:16:43Z","upstream":["CVE-2026-53254"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53254"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.143.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-90917.json"}}],"schema_version":"1.9.0"}