CVE-2026-31671
Medium
Description
In the Linux kernel, the following vulnerability has been resolved: xfrm_user: fix info leak in build_report() struct xfrm_user_report is a __u8 proto field followed by a struct xfrm_selector which means there is three "empty" bytes of padding, but the padding is never zeroed before copying to userspace. Fix that up by zeroing the structure before setting individual member variables.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Linux Kernel
PublishedApr 24, 2026
First seenApr 24, 2026
Weakness typeCWE-401CWE-401
How to fix
Update
- linux linux_kernel5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82, 6.18.23, 6.19.13 or later
Patches
- git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9
- git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72
- git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22fe
- git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2cc
- git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4
- git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8
- git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62
- git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 2.6.19.1 ≤ v < 5.10.253, 5.11 ≤ v < 5.15.203, 5.16 ≤ v < 6.1.169, 6.2 ≤ v < 6.6.135, 6.7 ≤ v < 6.12.82, 6.13 ≤ v < 6.18.23, 6.19 ≤ v < 6.19.13, 2.6.19, 7.0 | 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82, 6.18.23, 6.19.13 |
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