CVE ID :CVE-2026-64192<\/p>\n
Published : July 20, 2026, 5:18 p.m. | 25\u00a0minutes ago<\/p>\n
Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized<\/p>\n
When CONFIG_BPF_LSM=y is set, BPF inode storage maps
\n(BPF_MAP_TYPE_INODE_STORAGE) are compiled into the kernel. However,
\nif the BPF LSM is not explicitly enabled at boot time (e.g. omitted
\nfrom the “lsm=” boot parameter), lsm_prepare() is never executed for
\nthe BPF LSM.<\/p>\n
Consequently, the BPF inode security blob offset
\n(bpf_lsm_blob_sizes.lbs_inode) is never initialized and remains at
\nits default compiled size of 8 bytes instead of being updated to a
\nvalid offset past the reserved struct rcu_head (typically 16 bytes
\nor more).<\/p>\n
When a privileged user creates and updates a BPF_MAP_TYPE_INODE_STORAGE
\nmap, bpf_inode() evaluates inode->i_security + 8. This erroneously
\naliases the struct rcu_head.func callback pointer at the beginning
\nof the inode->i_security blob. During subsequent map element cleanup
\nor inode destruction, writing NULL to owner_storage clears the queued
\nRCU callback pointer. When rcu_do_batch() later executes the queued
\ncallback, it attempts an instruction fetch at address 0x0, triggering
\nan immediate kernel panic.<\/p>\n
Fix this by introducing a global bpf_lsm_initialized boolean flag
\nmarked with __ro_after_init. Set this flag to true inside bpf_lsm_init()
\nwhen the LSM framework successfully registers the BPF LSM. Gate map
\nallocation in inode_storage_map_alloc() on this flag, returning
\n-EOPNOTSUPP if the BPF LSM is in turn uninitialized.<\/p>\n
This fail-fast approach prevents userspace from allocating inode
\nstorage maps when the supporting BPF LSM infrastructure is absent,
\navoiding zombie map states.<\/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-2026-64192 Published : July 20, 2026, 5:18 p.m. | 25\u00a0minutes ago Description :In the Linux kernel, the following vulnerability has been resolved: bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized When CONFIG_BPF_LSM=y is set, BPF inode storage maps (BPF_MAP_TYPE_INODE_STORAGE) are compiled into the kernel. However, if the BPF LSM is not explicitly …<\/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-82298","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82298","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=82298"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82298\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82298"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82298"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82298"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}