CVE-2026-74400

CVE CVE-2026-74400EUVD EUVD-2026-59547Published 2026-08-15T05:59:11.000ZLast changed 2026-08-17T05:18:40.000Z

What the advisory describes

In the Linux kernel, the following vulnerability has been resolved: bpf: fix crash in bpf_[set|remove]_dentry_xattr for negative dentries bpf_set_dentry_xattr and bpf_remove_dentry_xattr BPF kfuncs attempt to lock the inode of the supplied dentry without checking if it is NULL. If a negative dentry is passed (e.g. from security_inode_create), d_inode(dentry) returns NULL, and inode_lock(inode) will cause a NULL pointer dereference. Trivially fix this by adding a NULL check for inode before attempting to lock it, returning -EINVAL if it is NULL. Additionally, drop WARN_ON(!inode) in bpf_xattr_read_permission() and bpf_xattr_write_permission(). These warnings could be triggered by passing a negative dentry to bpf_get_dentry_xattr() or the _locked variants of the xattr kfuncs, potentially causing a Denial of Service on systems with panic_on_warn enabled. Instead, simply return -EINVAL.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux 56467292794b800164df20c076c409ac548e56ec <e003f3a4be738f650e283e92d07017c3fef8da52; patch: 6.18.40; patch: 7.2; patch: 7.1.5; patch: 0; 56467292794b800164df20c076c409ac548e56ec <0160edf2af51c5fde742973742c5d10497901b21; 56467292794b800164df20c076c409ac548e56ec <07410646f6ff1d23222f105ccab778957d401bbe; 6.15

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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