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CVE-2026-52976 high CVSS 7.8

Use-After-Free in Linux kernel (CVE-2026-52976)

Summary

Vulnerability in Linux kernel (CVE-2026-52976). Successful exploitation can lead to full system takeover.

Original description

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

drm/xe: Fix error cleanup in xe_exec_queue_create_ioctl()

Two error handling issues exist in xe_exec_queue_create_ioctl():

  1. When xe_hw_engine_group_add_exec_queue() fails, the error path jumps
    to put_exec_queue which skips xe_exec_queue_kill(). If the VM is in
    preempt fence mode, xe_vm_add_compute_exec_queue() has already added
    the queue to the VM's compute exec queue list. Skipping the kill
    leaves the queue on that list, leading to a dangling pointer after
    the queue is freed.

  2. When xa_alloc() fails after xe_hw_engine_group_add_exec_queue() has
    succeeded, the error path does not call
    xe_hw_engine_group_del_exec_queue() to remove the queue from the hw
    engine group list. The queue is then freed while still linked into
    the hw engine group, causing a use-after-free.

Fix both by:

  • Changing the xe_hw_engine_group_add_exec_queue() failure path to jump
    to kill_exec_queue so that xe_exec_queue_kill() properly removes the
    queue from the VM's compute list.
  • Adding a del_hw_engine_group label before kill_exec_queue for the
    xa_alloc() failure path, which removes the queue from the hw engine
    group before proceeding with the rest of the cleanup.

(cherry picked from commit 37c831f401746a45d510b312b0ed7a77b1e06ec8)

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-52976 has been found in Linux kernel.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Linux kernel CVE-2026-52976" on the vendor's site.

CVE-2026-52976 (Linux kernel) — CWE-416 / CVSS v3 7.8
Attack vector: local / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Use-after-free (CWE-416) exists in Linux kernel.

📍 Affected scope

Check the vendor advisory for the affected versions of Linux kernel.

🔥 Severity

Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで Linux kernel を使っているサービスとバージョンを洗い出す。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Linux Kernel
[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.12.91"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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