In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Fix potential UAF in bpf_netns_link_update_prog<\/p>\n
In bpf_netns_link_update_prog, the checks for old_prog and prog type
\nare currently performed locklessly before acquiring netns_bpf_mutex.
\nThis creates a race condition that can lead to a UAF issue.<\/p>\n
If two threads concurrently execute BPF_LINK_UPDATE on the same netns
\nlink, the following execution path can trigger a UAF:<\/p>\n
CPU0 CPU1
\nbpf_netns_link_update_prog
\n if (old_prog && old_prog != link->prog)
\n return -EPERM;
\n bpf_netns_link_update_prog
\n if (old_prog && old_prog != link->prog)
\n …
\n old_prog = xchg(&link->prog, new_prog);
\n bpf_prog_put(old_prog);
\n if (new_prog->type != link->prog->type) type checks inside the
\nnetns_bpf_mutex critical section. Meanwhile, use guard() to simplify
\nlock management and avoid all the goto jumping.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Fix potential UAF in bpf_netns_link_update_prog<\/p>\n
In bpf_netns_link_update_prog, the checks for old_prog and prog type
\nare curr<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25802","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25802","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=25802"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25802"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25802"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}