CVE-2026-31471

Summary

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

xfrm: iptfs: only publish mode_data after clone setup

iptfs_clone_state() stores x->mode_data before allocating the reorder window. If that allocation fails, the code frees the cloned state and returns -ENOMEM, leaving x->mode_data pointing at freed memory.

The xfrm clone unwind later runs destroy_state() through x->mode_data, so the failed clone path tears down IPTFS state that clone_state() already freed.

Keep the cloned IPTFS state private until all allocations succeed so failed clones leave x->mode_data unset. The destroy path already handles a NULL mode_data pointer.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux6be02e3e4f376fea468846c8562655ca5ee18204 < 371a43c4ac70cac0de9f9b1fc5b1660b9565b9f1affected
LinuxLinux6be02e3e4f376fea468846c8562655ca5ee18204 < 5784a1e2889c9525a8f036cb586930e232170bf7affected
LinuxLinux6be02e3e4f376fea468846c8562655ca5ee18204 < d849a2f7309fc0616e79d13b008b0a47e0458b6eaffected
LinuxLinux6.14affected
LinuxLinux0 < 6.14unaffected
LinuxLinux6.18.21 <= 6.18.*unaffected
LinuxLinux6.19.11 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References