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Linux KernelOperating system · Linux

CVE-2006-1523

HIGH · 10.0 CVSS v2.0 Developing Published 2006-04-12
No fix yet
No fix has been published. The vendor has not shipped a fixed release or patch. You remain exposed.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
The __group_complete_signal function in the RCU signal handling (signal.c) in Linux kernel 2.6.16, and possibly other versions, has unknown impact and attack vectors related to improper use of BUG_ON.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · low confidence
Developing — this CVE was published recently and its authoritative NVD entry is still being established, so we're holding a technical summary until the source data settles rather than publish something unreliable. Re-checking after 2026-08-02.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:= 2.6.16

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Authentication
None
Confidentiality
Complete
Integrity
Complete
Availability
Complete

AV:N/AC:L/Au:N/C:C/I:C/A:C

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Recommended fix Moderate confidence

Linux Kernel 2.6.17 or later (preferably a modern stable kernel such as 5.x or 6.x for long-term security support)

  1. 1. Backup all critical data and verify you have a recovery mechanism in place
  2. 2. Check the current running kernel version: uname -r
  3. 3. Upgrade the Linux kernel to version 2.6.17 or later (the vulnerability was patched after 2.6.16)
  4. 4. For Debian-based systems: apt-get update && apt-get install linux-image-$(uname -r | cut -d- -f1) or use distribution-specific kernel packages
  5. 5. For Red Hat-based systems: yum install kernel or use the latest available kernel via package manager
  6. 6. Reboot the system into the new kernel: reboot
  7. 7. Verify the new kernel is running: uname -r
  8. 8. Confirm the vulnerability is addressed by checking that the __group_complete_signal function no longer contains the problematic BUG_ON
Caveat Kernel upgrades may require matching kernel modules/driver packages; ensure compatible userspace tools and verify application compatibility before production deployment

Generated from the published advisory — verify against the referenced sources before acting.

No vendor fix exists Linux Kernel has not published a patch for this.

There is no version to upgrade to and no patch to apply. Every affected install stays exposed until the vendor ships a fix — or somebody else builds one.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2006-1523 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
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