UnratedFix available
xfrm_user: fix info leak in build_report()
Type: advisorySources: OSV
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.253, 5.15.203, 6.1.169, 6.12.82, 6.18.23, 6.19.13, 6.6.135
- CVEs
- CVE-2026-31671
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 03:44 UTC · Revision 1
Source evidence
xfrm_user: fix info leak in build_report()
core-osv · Original sourcePublished 24 Apr 2026, 14:45 UTC
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.
osv:CVE-2026-31671
Kernel
Fixed versions: 5.10.253, 5.15.203, 6.1.169, 6.6.135, 6.12.82, 6.18.23, 6.19.13
Complete source record
{
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"url": "https://osv.dev/vulnerability/CVE-2026-31671",
"method": "structured",
"payload": {
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"title": "xfrm_user: fix info leak in build_report()",
"summary": "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.",
"evidence": "osv:CVE-2026-31671",
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"modified": "2026-10-28T02:30:25.869440758Z",
"provider": "osv",
"references": [
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"https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
"https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31671.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-31671",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"provider_metadata": {
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"related_cves": [
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 492254,
"published_at": "2026-04-24T14:45:18.669+00:00"
}