CVE ID : CVE-2025-40210<\/p>\n
Published : Nov. 21, 2025, 10:21 a.m. | 54\u00a0minutes ago<\/p>\n
Description : In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
Revert “NFSD: Remove the cap on number of operations per NFSv4 COMPOUND”<\/p>\n
I’ve found that pynfs COMP6 now leaves the connection or lease in a
\nstrange state, which causes CLOSE9 to hang indefinitely. I’ve dug
\ninto it a little, but I haven’t been able to root-cause it yet.
\nHowever, I bisected to commit 48aab1606fa8 (“NFSD: Remove the cap on
\nnumber of operations per NFSv4 COMPOUND”).<\/p>\n
Tianshuo Han also reports a potential vulnerability when decoding
\nan NFSv4 COMPOUND. An attacker can place an arbitrarily large op
\ncount in the COMPOUND header, which results in:<\/p>\n[ 51.410584] nfsd: vmalloc error: size 1209533382144, exceeds total
\npages, mode:0xdc0(GFP_KERNEL|__GFP_ZERO),
\nnodemask=(null),cpuset=\/,mems_allowed=0<\/p>\n
when NFSD attempts to allocate the COMPOUND op array.<\/p>\n
Let’s restore the operation-per-COMPOUND limit, but increased to 200
\nfor now.<\/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-2025-40210 Published : Nov. 21, 2025, 10:21 a.m. | 54\u00a0minutes ago Description : In the Linux kernel, the following vulnerability has been resolved: Revert “NFSD: Remove the cap on number of operations per NFSv4 COMPOUND” I’ve found that pynfs COMP6 now leaves the connection or lease in a strange state, which causes …<\/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-74076","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/74076","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=74076"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/74076\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=74076"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=74076"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=74076"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}