Xen: use-after-free vulnerability

Linux kernel

A use-after-free vulnerability in Xen's xen-blkback component can be triggered by a guest, potentially leading to a crash or other security issues.

Do this now

Upgrade Linux to 7.3.3, 6.18.62, 6.12.116, 6.6.162, 6.1.192, 5.15.225 or 5.10.274, matching your release line.

Who should check: teams running Linux kernel

Fix it

Linux

On 5.10.xUpgrade to Linux 5.10.274
On 5.15.xUpgrade to Linux 5.15.225
On 6.1.xUpgrade to Linux 6.1.192
On 6.6.xUpgrade to Linux 6.6.162
On 6.12.xUpgrade to Linux 6.12.116
On 6.18.xUpgrade to Linux 6.18.62
On 7.3.xUpgrade to Linux 7.3.3

First seen: 6 Nov 2026
Last update: 7 Nov 2026, 17:18 UTC
Fixed in: 7.3.3
6.18.62
6.12.116
6.6.162
6.1.192
5.15.225
5.10.274
Identifiers: CVE-2026-100082
Source: news
On the menu as: Linux kernel

Check this repository for exposure to one security incident from pwned.coffee. Report first, change nothing until I say so.

## Xen: use-after-free vulnerability
Severity: unknown. Patch status: patched.
Affected: Linux kernel
Fixed in: 7.3.3, 6.18.62, 6.12.116, 6.6.162, 6.1.192, 5.15.225, 5.10.274
Ids: CVE-2026-100082

A use-after-free vulnerability in Xen's xen-blkback component can be triggered by a guest, potentially leading to a crash or other security issues.

## Steps
1. This touches infrastructure (linux). Look in terraform, ansible, cloud-init, Dockerfiles and docs for the product and version we run. If it isn't in the repo, say so and list what a human should check on the box.
2. Fix by release line: Linux: 7.3.x → 7.3.3; 6.18.x → 6.18.62; 6.12.x → 6.12.116; 6.6.x → 6.6.162; 6.1.x → 6.1.192; 5.15.x → 5.15.225; 5.10.x → 5.10.274.

## Fix by release line
| Line | State | Fix | Until then |
|---|---|---|---|
| Linux 7.3.x | fixed | 7.3.3 | — |
| Linux 6.18.x | fixed | 6.18.62 | — |
| Linux 6.12.x | fixed | 6.12.116 | — |
| Linux 6.6.x | fixed | 6.6.162 | — |
| Linux 6.1.x | fixed | 6.1.192 | — |
| Linux 5.15.x | fixed | 5.15.225 | — |
| Linux 5.10.x | fixed | 5.10.274 | — |

## Report
A table: file, product or package, version in use, affected yes/no, exact fix. Then anything a human has to check outside the repo.

If you have the pwned.coffee MCP server (https://pwned.coffee/mcp), call lookup_cve("CVE-2026-100082") for the latest, and check_repo with this repo's lockfiles, Dockerfiles and workflows for a full receipt.
Sources: https://seclists.org/oss-sec/2026/q4/545
https://pwned.coffee/i/xen-use-after-free-vulnerability-cve-2026-100082

Timeline

7 Nov 2026, 17:18 UTC
Fix status: unknown → patched.
6 Nov 2026, 17:18 UTC
Fix status: no fix yet → unknown.
6 Nov 2026
First reported.

Receipt

Exploitation: No known exploitation
Fix by release line: Product Affected Fixed in Source
Linux 7.3 to before 7.3.3 7.3.3 CVE record (CNA) checked 7 Nov
Linux 6.18 to before 6.18.62 6.18.62 CVE record (CNA) checked 7 Nov
Linux 6.12 to before 6.12.116 6.12.116 CVE record (CNA) checked 7 Nov
Linux 6.6 to before 6.6.162 6.6.162 CVE record (CNA) checked 7 Nov
Linux 6.1 to before 6.1.192 6.1.192 CVE record (CNA) checked 7 Nov
Linux 5.15 to before 5.15.225 5.15.225 CVE record (CNA) checked 7 Nov
Linux 5.10 to before 5.10.274 5.10.274 CVE record (CNA) checked 7 Nov
Score: No CVSS published yet: severity unknown.
Last checked: 7 Nov 2026, 18:18 UTC

Product	Affected	Fixed in	Source
Linux	7.3 to before 7.3.3	7.3.3	CVE record (CNA) checked 7 Nov
Linux	6.18 to before 6.18.62	6.18.62	CVE record (CNA) checked 7 Nov
Linux	6.12 to before 6.12.116	6.12.116	CVE record (CNA) checked 7 Nov
Linux	6.6 to before 6.6.162	6.6.162	CVE record (CNA) checked 7 Nov
Linux	6.1 to before 6.1.192	6.1.192	CVE record (CNA) checked 7 Nov
Linux	5.15 to before 5.15.225	5.15.225	CVE record (CNA) checked 7 Nov
Linux	5.10 to before 5.10.274	5.10.274	CVE record (CNA) checked 7 Nov

Sources: KEV – CVE record ✓ Vendor ✓

Sources

seclists.org: Xen Security Advisory 528 v1 (CVE-2026-100082) - Linux xen-blkback: guest can trigger use-after-free for reading statistic data

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