Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 56467292794b800164df20c076c409ac548e56ec before e003f3a4be738f650e283e92d07017c3fef8da52; affected 56467292794b800164df20c076c409ac548e56ec before 0160edf2af51c5fde742973742c5d10497901b21; affected 56467292794b800164df20c076c409ac548e56ec before 07410646f6ff1d23222f105ccab778957d401bbe |
| Linux / Linux | affected 6.15; unaffected 0 before 6.15; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.