CVE-2026-97594

Status: UPDATED  |  Advisory ID: CVE-2026-97594

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

landlock: Fix use-after-free of the source's parent directory

current_check_refer_path() reads old_dentry->d_parent without holding a

reference nor a lock on it, and then dereferences it in

collect_domain_accesses() and in the audit record.

A reference on a child does not pin its parent: __d_move() reassigns

dentry->d_parent and drops the reference the child held on its former

parent. hook_path_rename() is not affected because the rename path

calls lock_rename() before the hook, so the source cannot be reparented

under it. hook_path_link() has no such protection: filename_linkat()

holds a reference on the source dentry but neither locks nor references

its parent, so a concurrent rename(2) can reparent the source while

security_path_link() runs, and the former parent can then be removed and

freed while the hook walks it.

A process can trigger this after entering a Landlock domain that handles

at least one filesystem access right. The process can then race a

linkat(2) loop against rename(2) and rmdir(2):

BUG: KASAN: slab-use-after-free in collect_domain_accesses+0x278/0x290

Read of size 4 at addr ffff888160bd53f4 by task llrepro2/549

collect_domain_accesses+0x278/0x290

current_check_refer_path+0x952/0x1120

security_path_link+0x1be/0x320

filename_linkat+0x342/0x6d0

__x64_sys_linkat+0xfa/0x150

Freed by task 562:

kmem_cache_free+0x139/0x4c0

i_callback+0x4b/0x80

rcu_core+0x7dc/0x10a0

Take a reference on the dentry selected as the source parent, using

dget() for the common-mount-root case and dget_parent() otherwise.

Release it after the hierarchy walk and synchronous audit logging.

[mic: Clarify the caller, reachability, and reference handling] (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References