CVE ID :CVE-2026-52944<\/p>\n
Published : June 24, 2026, 9:59 a.m. | 1\u00a0hour, 45\u00a0minutes ago<\/p>\n
Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE<\/p>\n
FSCTL_SET_SPARSE in fsctl_set_sparse() modifies the file’s sparse
\nattribute and saves it through xattr without any permission checks.<\/p>\n
This exposes two issues:<\/p>\n
1) A client on a read-only share can change the sparse attribute
\n on files it opened, even though the share is read-only.
\n Other FSCTL write operations already check
\n test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE),
\n but FSCTL_SET_SPARSE does not.<\/p>\n
2) Even on writable shares, clients without FILE_WRITE_DATA or
\n FILE_WRITE_ATTRIBUTES access should not modify the sparse
\n attribute. Similar handle-level checks exist in other functions
\n but are missing here.<\/p>\n
Add both share-level writable check and per-handle access check.
\nUse goto out on error to avoid leaking file references.<\/p>\n
Severity: 0.0 | NA<\/p>\n
Visit the link for more details, such as CVSS details, affected products, timeline, and more…\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"
CVE ID :CVE-2026-52944 Published : June 24, 2026, 9:59 a.m. | 1\u00a0hour, 45\u00a0minutes ago Description :In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix FSCTL permission bypass by adding a permission check for FSCTL_SET_SPARSE FSCTL_SET_SPARSE in fsctl_set_sparse() modifies the file’s sparse attribute and saves it through xattr without any permission checks. This …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-81005","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81005","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=81005"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/81005\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=81005"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=81005"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=81005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}