{"id":"CVE-2026-53254","title":"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->data to protocol-specific structs\nwithout validating skb->len first","summary":"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->data to protocol-specific structs\nwithout validating skb->len first. A malicio…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-125"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.12.1, < 5.15.210","linux_kernel >= 5.16, < 6.1.176","linux_kernel >= 6.2, < 6.6.143","linux_kernel >= 6.7, < 6.12.94","linux_kernel >= 6.13, < 6.18.36","linux_kernel >= 6.19, < 7.0.13","linux_kernel = 2.6.12","linux_kernel = 7.1"],"patched":["linux_kernel 7.0.13"],"published":"2026-06-25","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:20:07.123","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53254","references":[{"url":"https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0ef","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00268,"epssPercentile":0.17584,"ingestedAt":"2026-10-15T03:30:12.910Z","slug":"CVE-2026-53254","body":"## Overview\n\nIn 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->data to protocol-specific structs\nwithout validating skb->len 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 > 1.\n\n## Affected\n\n- `linux_kernel >= 2.6.12.1, < 5.15.210`\n- `linux_kernel >= 5.16, < 6.1.176`\n- `linux_kernel >= 6.2, < 6.6.143`\n- `linux_kernel >= 6.7, < 6.12.94`\n- `linux_kernel >= 6.13, < 6.18.36`\n- `linux_kernel >= 6.19, < 7.0.13`\n- `linux_kernel = 2.6.12`\n- `linux_kernel = 7.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.13`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}