bpf: fix crash in bpf_[set|remove]_dentry_xattr for negative dentries

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74400
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:42 UTC
Updated2026-08-15 06:22:42 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 56467292794b800164df20c076c409ac548e56ec e003f3a4be738f650e283e92d07017c3fef8da52 git Not specified
CNA Linux Linux affected 56467292794b800164df20c076c409ac548e56ec 0160edf2af51c5fde742973742c5d10497901b21 git Not specified
CNA Linux Linux affected 56467292794b800164df20c076c409ac548e56ec 07410646f6ff1d23222f105ccab778957d401bbe git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e003f3a4be738f650e283e92d07017c3fef8da52 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/07410646f6ff1d23222f105ccab778957d401bbe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0160edf2af51c5fde742973742c5d10497901b21 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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