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Weekly Signal
Live intelligence Updated 19 Aug 2026 · 20:27 UTC

Amazon, Arista, Canonical +7 more · Amazon Linux, Cloudvision Agni, Cloudvision Portal +41 more

CVE-2026-31431

Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability

Recommended action

Validate affected assets and exposure now, then remediate on an accelerated schedule. "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

View response plan
CVSS7.8
EPSS99.9%
KEVYes
ExploitationConfirmed exploitation
PatchPatch or guidance available ↓

Assessment

Why it matters

CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.9%; technical severity is CVSS 7.8.

In the Linux kernel, the following vulnerability has been resolved: crypto: algif_aead - Revert to operating out-of-place This mostly reverts commit 72548b093ee3 except for the copying of the associated data. There is no benefit in operating in-place in algif_aead since the source and destination come from different mappings. Get rid of all the complexity added for in-place operation and just copy the AD directly.

Who should care

  • Teams operating Amazon Linux, Cloudvision Agni, Cloudvision Portal +41 more
  • Vulnerability and exposure management teams
  • Security operations teams monitoring exploitation activity

Response plan

What I would do

  1. Confirm whether Amazon Linux, Cloudvision Agni, Cloudvision Portal +41 more is present in the environment.
  2. Identify affected versions and establish whether vulnerable services are exposed or reachable.
  3. "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  4. Review relevant security telemetry for evidence of attempted or successful exploitation.
  5. Document the remediation decision and track it to verified completion.

Vendor remediation

Patch and remediation links

Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.

Technical details

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-669
Affected versions
Amazon Amazon Linux (Version: -); Arista Cloudvision Agni (Start Including: 2024.4.0, End Including: 2025.2.2); Arista Cloudvision Portal (Start Including: 2024.2.0, End Including: 2026.1.0); Arista Netvisor Os (Version: 7.1.0); Arista Velocloud Edge (Start Including: 4.5.0, End Including: 6.4.1); Arista Velocloud Gateway (Version: -); Arista VeloCloud Orchestrator (Version: -); Canonical Ubuntu Linux (Version: 25.10)
Published
22 April 2026
Attack vector
Local
Privileges required
Low
User interaction
None

Signal timeline

  1. CVE published
  2. Added to CISA KEV
  3. Latest EPSS score: 99.9%
  4. Signal calculated at 83

External references

Live public intelligence This assessment combines public-source evidence. Validate the affected product, version and exposure against your own environment before making a risk decision.