CVE-2026-80758
UnknownSummary
In the Linux kernel, the futex mechanism has a use-after-free vulnerability in futex_private_hash_put(). This function drops the reference to fph before reading fph->mm for wake_up_var(). If that put drops the final reference and the task is preempted, another task can pivot to the replacement hash and free the old hash after an RCU grace period, and the first task reads from freed memory. The fix loads the mm pointer while the fph reference is still held and passes the saved value to wake_up_var().
Risk Assessment
The vulnerability can lead to memory corruption, potentially enabling privilege escalation or denial of service. Exploitation requires specific preemption conditions but is realistic in multithreaded environments.
Recommendation
It is recommended to urgently update the Linux kernel to a version with the fix for CVE-2026-80758. Monitoring systems for unusual futex-related behavior may help detect attacks.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: futex: Avoid private hash use-after-free on final put futex_private_hash_put() drops the reference to fph before evaluating fph->mm for wake_up_var(). futex_ref_put() enables preemption again before returning. If that put drops the final reference and the task is preempted, another task can pivot to the replacement hash and free the old hash after an RCU grace period. The first task then reads fph->mm from the freed allocation when it resumes. KASAN reports a slab-use-after-free in futex_private_hash_put(), with the read at offset 24 in a freed kmalloc-512 allocation. The allocation and free stacks point to futex_hash_allocate() and the RCU free path, respectively. Load the mm pointer while the fph reference is still held and pass the saved value to wake_up_var(). wake_up_var() uses the pointer as a waitqueue key and does not dereference the mm through it.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS