CVE-2004-0495: Multiple unknown vulnerabilities in Linux kernel 2.4 and 2.6 allow local users to gain privileges or access ke

Routine

HIGH 7.2WATCHLISTMITIGATEMITIGATEMITIGATE

CVE-2004-0495 is a high-severity flaw (CVSS 7.2) affecting converged communications server, modular messaging message storage server, linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple unknown vulnerabilities in Linux kernel 2.4 and 2.6 allow local users to gain privileges or access kernel memory, as found by the Sparse source code checking tool.

Why this priority

High severity
On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Published	2004-08-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: avaya · gentoo · linux · redhat · suse

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2004-08-06 04:00 UTCPublished CVE record published
2026-06-16 22:05 UTCUpdated Record last modified

avaya converged communications server MITIGATE

Affected: 2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0

Firmware

Install the latest firmware from the vendor advisory; if none, apply the vendor workaround.

avaya modular messaging message storage server MITIGATE

Affected: s3400

Fixed in: no fixed release known

Safe to downgrade to: a release before s3400

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

gentoo linux MITIGATE

Affected: 1.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.4

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

linux linux kernel MITIGATE

Affected: 2.4.18 · 2.4.19 · 2.4.21 · 2.4.22 · 2.4.23 · 2.4.24 · 2.4.25 · 2.4.26

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Downgrade not recommended

This is a core system component: downgrading can break the OS. Apply the distro update or the vendor mitigation.

redhat enterprise linux MITIGATE

Affected: 2.1 · 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

suse suse linux MITIGATE

Affected: 7 · 8 · 8.0 · 8.1 · 8.2 · 9.0 · 9.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 7

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2004-0495?

converged communications server: mitigate or apply the listed mitigation; modular messaging message storage server: mitigate or apply the listed mitigation; linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0495 being exploited?

CVE-2004-0495 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2004-0495 affect?

CVE-2004-0495 affects converged communications server, modular messaging message storage server, linux. Severity is high (CVSS 7.2). Multiple unknown vulnerabilities in Linux kernel 2.4 and 2.6 allow local users to gain privileges or access kernel memory, as found by the Sparse source code checking tool.

How urgent is CVE-2004-0495?

Priority 39/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

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References

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