Linux kernel TDX guest quote buffer length out-of-bounds read
CVE-2026-31470 is a Linux kernel vulnerability in the virt: tdx-guest component affecting TDX guest remote attestation handling. The flaw arises from trusting the host-controlled field quote_buf->out_len, which determines how many bytes of the attestation quote are copied from the shared quote buffer to guest userspace. If the host supplies a length larger than the guest-allocated buffer, or races modification of the response while the guest is consuming it, the guest can read data beyond the pages allocated for quote_buf up to TSM_REPORT_OUTBLOB_MAX. The issue was fixed by validating quote_buf->out_len before copying data to userspace.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
configs-tsm-report interfaces, the disclosure may cross container isolation boundaries and is not necessarily limited to local root-only impact. The issue is primarily a confidentiality flaw, with possible availability impact reflected in vendor scoring.Mitigation
If you can’t patch tonight, do this now.
configs-tsm-report exposure. Limit access to attestation-related device or report interfaces to only trusted workloads, minimize opportunities for untrusted host influence in affected TDX deployments, and avoid forwarding attestation quotes from sensitive multi-tenant/containerized environments unless necessary. These are partial mitigations only; kernel update is the definitive fix.Remediation
Patch, then assume compromise.
6.4.0-150700.53.55.1 or later, SLES 16.0 kernel packages 6.12.0-160000.33.1 or later, and corresponding fixed kernels for affected Micro and openSUSE releases. Reboot into the updated kernel after installation.Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
4 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.