In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: validate sockaddr length per family in listener_set<\/p>\n
nfsd_sock_nl_policy declares NFSD_A_SOCK_ADDR as a bare NLA_BINARY
\nattribute with no minimum length. A CAP_NET_ADMIN caller can send a
\n16-byte NFSD_A_SOCK_ADDR with sa_family=AF_INET6, causing a 12-byte
\nOOB read across three consumers (rpc_cmp_addr_port, svc_find_listener,
\nkernel_bind).<\/p>\n
nfsd_nl_listener_set_doit() also parsed and validated each listener
\nentry inline in two separate loops, interleaved with mutating the
\nrunning listener configuration. The validation was duplicated, used an
\nopen-coded “nla_len < sizeof(struct sockaddr)" check that was too short
\nfor AF_INET6, and handled a malformed entry inconsistently depending on
\nwhich loop noticed it.<\/p>\n
Add an nfsd_nl_validate_listeners() helper that walks the entire list
\nonce and confirms each entry parses, carries both an address and a
\ntransport name, and is long enough for its address family
\n(sizeof(struct sockaddr_in) for AF_INET, sizeof(struct sockaddr_in6)
\nfor AF_INET6, -EAFNOSUPPORT otherwise). Call it before taking
\nnfsd_mutex or creating the serv, so a malformed request fails cleanly
\nwith no side effects.<\/p>\n
Since every entry is known valid by the time the two existing loops
\nrun, drop the redundant presence and per-family length checks from
\nboth, leaving only the nla_parse_nested() call needed to extract the
\ndata.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: validate sockaddr length per family in listener_set<\/p>\n
nfsd_sock_nl_policy declares NFSD_A_SOCK_ADDR as a bare NLA_BINARY
\nattri<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21622","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21622","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=21622"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21622"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21622"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}