CVE-2026-74400: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: 56467292794b800164df20c076c409ac548e56ec преди e003f3a4be738f650e283e92d07017c3fef8da52; 56467292794b800164df20c076c409ac548e56ec преди 0160edf2af51c5fde742973742c5d10497901b21; 56467292794b800164df20c076c409ac548e56ec преди 07410646f6ff1d23222f105ccab778957d401bbe
• Linux Linux: 6.15; преди 6.15; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; 7.2 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-74400
• https://nvd.nist.gov/vuln/detail/CVE-2026-74400
• https://git.kernel.org/stable/c/e003f3a4be738f650e283e92d07017c3fef8da52
• https://git.kernel.org/stable/c/0160edf2af51c5fde742973742c5d10497901b21
• https://git.kernel.org/stable/c/07410646f6ff1d23222f105ccab778957d401bbe