CVE-2026-31671: Linux vulnerability

CVE-2026-31671: xfrm_user: fix info leak in build_report()

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.

UnknownCVSS not scoredNot KEV-listedUpdatedOct 15, 2026, 01:17 UTC (UTC+00:00)

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2026-31671 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup

Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Apr 24, 2026, 14:45 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

3Timeline events

1ADP providers

12Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
Mar 9, 2026, 15:48 UTC (UTC+00:00)
CVE publishedCVE Program
The CVE record was published.
Apr 24, 2026, 14:45 UTC (UTC+00:00)
CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Oct 15, 2026, 01:17 UTC (UTC+00:00)

ADP provider summaries

Source materials

CVE List V5 sourceCVE List V5
https://git.kernel.org/stable/c/d27c02eec529f78055a46a5c9e6c62684382b2d8CVE reference, Linux
https://git.kernel.org/stable/c/716c546e88cfe49d841658240e10cb57bc50a2ccCVE reference, Linux
https://git.kernel.org/stable/c/0616314b3b34f24cbb91da8c6bd8bcdc4c8592f9CVE reference, Linux
https://git.kernel.org/stable/c/e0c8542c3d097ed4205ded51868195d5d6ddac62CVE reference, Linux
https://git.kernel.org/stable/c/ff5ee507302303b15859753c3e0d67d38fd12c88CVE reference, Linux
https://git.kernel.org/stable/c/6c55714c931051cd7f4839c19ce0867179fd22feCVE reference, Linux
https://git.kernel.org/stable/c/0a30dceb0e1f0c480d2482e6d7cebf8aebb6eb72CVE reference, Linux
https://git.kernel.org/stable/c/d10119968d0e1f2b669604baf2a8b5fdb72fa6b4CVE reference, Linux
https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlCVE reference, siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlCVE reference, siemens-SADP
https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlCVE reference, siemens-SADP

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

LinuxLinux97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5, 97a64b4577ae2bc5599dbd008a3cd9e25de9b9f5unaffected

LinuxLinux2.6.19, 0, 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82, 6.18.23, 6.19.13, 7.0affected

Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.