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NVD / CVE Program· CNA mitre

CVE-2003-0643: Integer signedness error in the Linux Socket Filter implementation (filter.c) in Linux 2.4.3-pre3 to 2.4.22-pre10 allows attackers to cause…

LowCVSS 2.1 · v2.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 8/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.37% (FIRST EPSS).
  • No special conditions are required; it is repeatable.
  • Fixed version: kernel-image-2.4.18-1-alpha (Debian:3.0) 2.4.18-8; kernel-image-2.4.18-1-i386 (Debian:3.0) 2.4.18-9; kernel-image-2.4.18-i386bf (Debian:3.0) 2.4.18-5woody2.

Low priority for now. Upgrade to kernel-image-2.4.18-1-alpha (Debian:3.0) 2.4.18-8; kernel-image-2.4.18-1-i386 (Debian:3.0) 2.4.18-9; kernel-image-2.4.18-i386bf (Debian:3.0) 2.4.18-5woody2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Integer signedness error in the Linux Socket Filter implementation (filter.c) in Linux 2.4.3-pre3 to 2.4.22-pre10 allows attackers to cause a denial of service (crash).

Published
Jul 25, 2003
Updated
Jun 16, 2026
EPSS
0.3% · 32th percentile
CWE
—

Report tools

JSON

Action score

8

Monitor

Low priority for now.

CVSS
8 / 40 · 2.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Follow CVE-2003-0643

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.4.10
  • linux linux kernel2.4.11
  • linux linux kernel2.4.12
  • linux linux kernel2.4.13
  • linux linux kernel2.4.14
  • linux linux kernel2.4.15
  • linux linux kernel2.4.16
  • linux linux kernel2.4.17
+12 more rows
  • linux linux kernel2.4.18
  • linux linux kernel2.4.19
  • linux linux kernel2.4.2
  • linux linux kernel2.4.20
  • linux linux kernel2.4.21
  • linux linux kernel2.4.22
  • linux linux kernel2.4.3
  • linux linux kernel2.4.4
  • linux linux kernel2.4.5
  • linux linux kernel2.4.6
  • linux linux kernel2.4.7
  • linux linux kernel2.4.8

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:3.0kernel-image-2.4.18-1-alphabefore 2.4.18-82.4.18-8
Debian:3.0kernel-image-2.4.18-1-i386before 2.4.18-92.4.18-9
Debian:3.0kernel-image-2.4.18-i386bfbefore 2.4.18-5woody22.4.18-5woody2
Debian:3.0kernel-source-2.4.18before 2.4.18-112.4.18-11

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2003-0246Jun 16, 2003 · The ioperm system call in Linux kernel 2.4.20 and earlier does not properly restrict privileges, which allows local users to gain read or…
    14Monitor
  • ← EarlierCVE-2003-0418Jul 24, 2003 · The Linux 2.0 kernel IP stack does not properly calculate the size of an ICMP citation, which causes it to include portions of unauthorized…
    21Monitor
  • Later →CVE-2003-0476Aug 7, 2003 · The execve system call in Linux 2.4.x records the file descriptor of the executable process in the file table of the calling process, which…
    8Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:kernel-image-2.4.18-1-alpha2.4.18-8 · Debian:3.0Package registry (OSV)
debian:kernel-image-2.4.18-1-i3862.4.18-9 · Debian:3.0Package registry (OSV)
debian:kernel-image-2.4.18-i386bf2.4.18-5woody2 · Debian:3.0Package registry (OSV)
debian:kernel-source-2.4.182.4.18-11 · Debian:3.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
P · the service can be disrupted
Attack complexity
Low
Confidentiality impact
None
Integrity impact
None
Availability impact
P

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records