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CVE-2026-53145 high CVSS 7.8

Vulnerability in Linux kernel (CVE-2026-53145)

Summary

Vulnerability in Linux kernel (CVE-2026-53145). 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/gem: Try to fix change_handle ioctl, attempt 4

[airlied: just added some comments on how to reenable]
On-list because the cat is out of the bag and we're clearly not good
enough to figure this out in private. The story thus far:

5e28b7b94408 ("drm: Set old handle to NULL before prime swap in
change_handle") tried to fix a race condition between the gem_close and
gem_change_handle ioctls, but got a few things wrong:

  • There's a confusion with the local variable handle, which is actually
    the new handle, and so the two-stage trick was actually applied to the
    wrong idr slot. 7164d78559b0 ("drm/gem: fix race between
    change_handle and handle_delete") tried to fix that by adding yet
    another code block, but forgot to add the error handling. Which meant
    we now have two paths, both kinda wrong.

  • dc366607c41c ("drm: Replace old pointer to new idr") tried to apply
    another fix, but inconsistently, again because of the handle confusion

    • this would be the right fix (kinda, somewhat, it's a mess) if we'd
      do the two-stage approach for the new handle. Except that wasn't the
      intent of the original fix.

We also didn't have an igt merged for the original ioctl, which is a big
no-go. This was attempted to address off-list in the original bugfix,
and amd QA people claimed the bug was fixed now. Very clearly that's not
the case. Here's my attempt to sort this out:

  • Rename the local variable to new_han…

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-2026-53145 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-2026-53145" on the vendor's site.

CVE-2026-53145 (Linux kernel) — CWE-367 / 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

A vulnerability (CWE-367) 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":"6.18.32"},{"fixed":"6.18.36"}]},{"type":"ECOSYSTEM","events":[{"introduced":"7.0.9"},{"fixed":"7.0.13"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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