In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/qeth: validate user buffer length in SNMP and ARP query ioctls<\/p>\n
qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer sized by
\na user-supplied length (udata_len) without checking a lower bound, then
\nset udata_offset to a fixed non-zero value and pass both to a reply
\ncallback. The callback bounds-checks the copy with<\/p>\n
if ((udata_len – udata_offset) < len)<\/p>\n
Both fields are u32, so a udata_len smaller than udata_offset makes the
\nsubtraction wrap and the check pass, and the following memcpy() writes
\npast the allocation. A udata_len of 0 also yields ZERO_SIZE_PTR from
\nkzalloc(), which the existing NULL check does not catch.<\/p>\n
Reject buffers smaller than udata_offset before allocating, so the
\ncallback subtraction can no longer underflow.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
s390\/qeth: validate user buffer length in SNMP and ARP query ioctls<\/p>\n
qeth_snmp_command() and qeth_l3_arp_query() allocate a buffer <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11980","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11980","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=11980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11980"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}