In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smack: fix cred UAF in smack_file_send_sigiotask()<\/p>\n
When inspecting the credentials of another task, objective credentials
\n(->real_cred, accessed with __task_cred()) must always be used.<\/p>\n
Accessing ->cred on a non-current task is forbidden unless that task is
\nbeing created or destroyed; a task is allowed to change its own ->cred
\npointer with no synchronization, and changing ->cred should only affect the
\ncurrent syscall.<\/p>\n
smack_file_send_sigiotask() was accessing both sets of credentials: First
\ntsk->cred, then __task_cred(tsk).<\/p>\n
Fix it, always access the objective credentials here.<\/p>\n
I have tested that this bug can lead to a KASAN-reported UAF of struct cred
\nin smack_file_send_sigiotask(), and that this fix prevents the race.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
smack: fix cred UAF in smack_file_send_sigiotask()<\/p>\n
When inspecting the credentials of another task, objective credentials
\n(->real_<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21261","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21261","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=21261"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21261"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21261"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}