CVE-2026-31471

xfrm: iptfs: only publish mode_data after clone setup

State: Published
Severity: 7.8 High
Published: Apr 22, 2026
Updated: Aug 5, 2026
Reserved: Mar 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	6be02e3e4f376fea468846c8562655ca5ee18204 to before 371a43c4ac70cac0de9f9b1fc5b1660b9565b9f1Affected 6be02e3e4f376fea468846c8562655ca5ee18204 to before 5784a1e2889c9525a8f036cb586930e232170bf7Affected 6be02e3e4f376fea468846c8562655ca5ee18204 to before d849a2f7309fc0616e79d13b008b0a47e0458b6eAffected
LinuxLinux	6.14Affected before 6.14Not affected 6.18.21 through 6.18.Not affected 6.19.11 through 6.19.Not affected 7.0 and laterNot affected

References

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