In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfc: llcp: avoid userspace overflow on invalid optlen<\/p>\n
nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so
\nthe kernel always stores 4 bytes regardless of the caller-supplied
\noptlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length
\nreported back to userspace; it does not constrain the store. A call with
\noptlen < 4 therefore writes past the user buffer, violating the
\ngetsockopt(2) contract for all five supported optnames.<\/p>\n
Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a
\nplain size comparison would promote a negative optlen to size_t and slip
\npast the check; an explicit 'len < 0' test is added first to catch
\nnegative values before the size compare.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfc: llcp: avoid userspace overflow on invalid optlen<\/p>\n
nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so
\nthe <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25635","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25635","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=25635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25635"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}