In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: tcp: fix double sock release on batch realloc<\/p>\n
bpf_iter_tcp_batch() releases the current batch via
\nbpf_iter_tcp_put_batch(), which drops the socket refs and rewrites
\neach slot with the socket cookie, then grows the batch. cur_sk\/end_sk
\nare kept for bpf_iter_tcp_resume(), but on realloc failure the function
\nreturns ERR_PTR() before resume runs, leaving cur_sk < end_sk over
\nslots that now hold cookies rather than sock pointers.
\nbpf_iter_tcp_seq_stop() then calls bpf_iter_tcp_put_batch() again and
\ndereferences a cookie as a struct sock.<\/p>\n
Empty the batch on the failure path so stop() does not release it
\nagain. The sockets were already freed by the first
\nbpf_iter_tcp_put_batch(), so nothing leaks, and a later read() rescans
\nthe bucket from the start instead of skipping it. The sibling
\nGFP_NOWAIT failure path still holds real socket references and is left
\nfor stop() to release.<\/p>\n
BUG: KASAN: null-ptr-deref in __sock_gen_cookie
\n Read of size 8 at addr 0000000000000059 by task exploit
\n …
\n __sock_gen_cookie (net\/core\/sock_diag.c:28)
\n bpf_iter_tcp_put_batch (net\/ipv4\/tcp_ipv4.c:2918)
\n bpf_iter_tcp_seq_stop (net\/ipv4\/tcp_ipv4.c:3270)
\n bpf_seq_read (kernel\/bpf\/bpf_iter.c:205)
\n vfs_read (fs\/read_write.c:572)
\n ksys_read (fs\/read_write.c:716)
\n do_syscall_64
\n entry_SYSCALL_64_after_hwframe
\n Kernel panic – not syncing: Fatal exception<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: tcp: fix double sock release on batch realloc<\/p>\n
bpf_iter_tcp_batch() releases the current batch via
\nbpf_iter_tcp_put_batch(), w<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-4651","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/4651","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=4651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4651"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}