In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers<\/p>\n
nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain
\nthree related bugs in their TLV parsing loops:<\/p>\n
1. ‘offset’ is declared u8 but tlv_array_len is u16. When TLV data
\n advances offset past 255 it silently wraps to zero, causing
\n infinite loops or double-processing of buffer data.<\/p>\n
2. Before reading tlv[0] (type) and tlv[1] (length) there is no
\n check that offset+2 <= tlv_array_len. A truncated TLV causes
\n an OOB read of one byte past the buffer end.<\/p>\n
3. After reading the length field, the value bytes are accessed
\n without checking offset+2+length <= tlv_array_len. A crafted
\n length=0xFF on a short buffer causes up to 255 bytes of OOB
\n read past the buffer end.<\/p>\n
Both functions are reachable without authentication via
\nnfc_llcp_set_remote_gb() which feeds remote LLCP general bytes
\ndirectly into nfc_llcp_parse_gb_tlv() with no additional
\nvalidation.<\/p>\n
Fix all three issues by widening offset from u8 to u16 and adding
\nbounds checks for both the TLV header and value field before each
\naccess.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfc: llcp: fix OOB read and u8 offset wrap in TLV parsers<\/p>\n
nfc_llcp_parse_gb_tlv() and nfc_llcp_parse_connection_tlv() contain
\nthre<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17303","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17303","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17303"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17303"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17303"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}