CVE-2026-97594
HighCVSS 7.8Summary
A use-after-free vulnerability was found in the Linux kernel's Landlock module, in the current_check_refer_path() function. During linkat() processing, the module accesses the source directory's parent without holding a reference or lock, allowing concurrent rename(2) and rmdir(2) to free and reuse memory. The issue is fixed by properly taking a reference on the parent dentry.
Risk Assessment
An attacker with Landlock domain privileges could trigger kernel memory corruption, potentially leading to privilege escalation, system crash, or information disclosure. The vulnerability requires local access and specific race conditions, but the impact is severe.
Recommendation
Apply the official Linux kernel patch addressing CVE-2026-97594 immediately and update to a patched kernel version. Additionally, restrict access to linkat() and rename() operations in Landlock environments if feasible.
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Original NVD description (English source)
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]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS