In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ksmbd: OOB read regression in smb_check_perm_dacl() ACE-walk loops<\/p>\n
Commit d07b26f39246 (“ksmbd: require minimum ACE size in
\nsmb_check_perm_dacl()”) introduced a transposed bounds check:<\/p>\n
if (offsetof(struct smb_ace, sid) + aces_size < CIFS_SID_BASE_SIZE)<\/p>\n
Since offsetof(..sid) is 8 and CIFS_SID_BASE_SIZE is 8, this evaluates
\nto `aces_size size` (offset 2) even when `aces_size` is 0-3 bytes. This
\nre-opens a 2-byte heap out-of-bounds (OOB) read past the pntsd allocation
\nduring subsequent SMB2_CREATE operations.<\/p>\n
Fix this by properly transposing the comparison to require at least
\n16 bytes (8-byte offset + 8-byte SID base), matching the correct form
\nused in smb_inherit_dacl().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ksmbd: OOB read regression in smb_check_perm_dacl() ACE-walk loops<\/p>\n
Commit d07b26f39246 (“ksmbd: require minimum ACE size in
\nsmb_ch<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-14947","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/14947","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=14947"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=14947"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=14947"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}