CVE ID : CVE-2025-40212<\/p>\n
Published : Nov. 24, 2025, 1:04 p.m. | 18\u00a0minutes ago<\/p>\n
Description : In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nfsd: fix refcount leak in nfsd_set_fh_dentry()<\/p>\n
nfsd exports a “pseudo root filesystem” which is used by NFSv4 to find
\nthe various exported filesystems using LOOKUP requests from a known root
\nfilehandle. NFSv3 uses the MOUNT protocol to find those exported
\nfilesystems and so is not given access to the pseudo root filesystem.<\/p>\n
If a v3 (or v2) client uses a filehandle from that filesystem,
\nnfsd_set_fh_dentry() will report an error, but still stores the export
\nin “struct svc_fh” even though it also drops the reference (exp_put()).
\nThis means that when fh_put() is called an extra reference will be dropped
\nwhich can lead to use-after-free and possible denial of service.<\/p>\n
Normal NFS usage will not provide a pseudo-root filehandle to a v3
\nclient. This bug can only be triggered by the client synthesising an
\nincorrect filehandle.<\/p>\n
To fix this we move the assignments to the svc_fh later, after all
\npossible error cases have been detected.<\/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-2025-40212 Published : Nov. 24, 2025, 1:04 p.m. | 18\u00a0minutes ago Description : In the Linux kernel, the following vulnerability has been resolved: nfsd: fix refcount leak in nfsd_set_fh_dentry() nfsd exports a “pseudo root filesystem” which is used by NFSv4 to find the various exported filesystems using LOOKUP requests from a known …<\/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-74200","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/74200","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=74200"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/74200\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=74200"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=74200"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=74200"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}