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CVE-2009-2407· NVD / CVE Program· CNA redhat

Heap-based buffer overflow in the parse_tag_3_packet function in fs/ecryptfs/keystore.c in the eCryptfs subsystem in the Linux kernel before

Noroxi assessment

Priority: Monitor (action score 27/100)

  • 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: 0.59% (FIRST EPSS).
  • Fixed version: linux-2.6.24 (Debian:4.0) 2.6.24-6~etchnhalf.8etch2; linux-2.6 (Debian:5.0) 2.6.26-17lenny1; kernel (Red Hat:enterprise_linux:5::client) 0:2.6.18-128.4.1.el5.

Low priority for now. Upgrade to linux-2.6.24 (Debian:4.0) 2.6.24-6~etchnhalf.8etch2; linux-2.6 (Debian:5.0) 2.6.26-17lenny1; kernel (Red Hat:enterprise_linux:5::client) 0:2.6.18-128.4.1.el5 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

Heap-based buffer overflow in the parse_tag_3_packet function in fs/ecryptfs/keystore.c in the eCryptfs subsystem in the Linux kernel before 2.6.30.4 allows local users to cause a denial of service (system crash) or possibly gain privileges via vectors involving a crafted eCryptfs file, related to a large encrypted key size in a Tag 3 packet.

MediumCVSS 6.9 · v2.0—No exploit Fix available
Published
Jul 31, 2009
Updated
Jun 16, 2026
EPSS
0.5% · 47th percentile

Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
27 / 40 · 6.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

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

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
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  • 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 kernelup to 2.6.30.3 inclusive
  • linux linux kernel2.6.0
  • linux linux kernel2.6.1
  • linux linux kernel2.6.10
  • linux linux kernel2.6.11
  • linux linux kernel2.6.11.1
  • linux linux kernel2.6.11.10
  • linux linux kernel2.6.11.11
  • linux linux kernel2.6.11.12
  • linux linux kernel2.6.11.2
  • linux linux kernel2.6.11.3
  • linux linux kernel2.6.11.4
  • linux linux kernel2.6.11.5
  • linux linux kernel2.6.11.6
  • linux linux kernel2.6.11.7
  • linux linux kernel2.6.11.8
  • linux linux kernel2.6.11.9
  • linux linux kernel2.6.12
  • linux linux kernel2.6.12.1
  • linux linux kernel2.6.12.2

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:4.0linux-2.6.24before 2.6.24-6~etchnhalf.8etch22.6.24-6~etchnhalf.8etch2
Debian:5.0linux-2.6before 2.6.26-17lenny12.6.26-17lenny1
Red Hat:enterprise_linux:5::clientkernelbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-debugbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-debuginfobefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-develbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfobefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfo-commonbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-develbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-docbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-headersbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAEbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAE-debuginfobefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAE-develbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-xenbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-xen-debuginfobefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:enterprise_linux:5::clientkernel-xen-develbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:rhel_eus:5.3kernel-kdumpbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:rhel_eus:5.3kernel-kdump-debuginfobefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5
Red Hat:rhel_eus:5.3kernel-kdump-develbefore 0:2.6.18-128.4.1.el50:2.6.18-128.4.1.el5

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • 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
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now

Published before and after this one in the same product

  • ← EarlierCVE-2009-1897Jul 20, 2009 · The tun_chr_poll function in drivers/net/tun.c in the tun subsystem in the Linux kernel 2.6.30 and 2.6.30.1, when the -fno-delete-null-point
    27Monitor
  • ← EarlierCVE-2009-2584Jul 23, 2009 · Off-by-one error in the options_write function in drivers/misc/sgi-gru/gruprocfs.c in the SGI GRU driver in the Linux kernel 2.6.30.2 and ea
    28Monitor
  • Later →CVE-2009-2691Aug 14, 2009 · The mm_for_maps function in fs/proc/base.c in the Linux kernel 2.6.30.4 and earlier allows local users to read (1) maps and (2) smaps files
    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:linux-2.62.6.26-17lenny1 · Debian:5.0Package registry (OSV)
debian:linux-2.6.242.6.24-6~etchnhalf.8etch2 · Debian:4.0Package registry (OSV)
red hat:kernel0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug-debuginfo0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debug-devel0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debuginfo0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-debuginfo-common0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-devel0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-doc0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-headers0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE-debuginfo0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:kernel-PAE-devel0:2.6.18-128.4.1.el5 · Red Hat:enterprise_linux:5::clientPackage 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

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

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

    If successful

    Confidentiality
    C · data can be read
    Integrity
    C · data or configuration can be modified
    Availability
    C · the service can be disrupted
    Attack complexity
    M
    Confidentiality impact
    C
    Integrity impact
    C
    Availability impact
    C

    Weakness class (CWE)

    CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

    CVSS vector

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

    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.

    ATT&CK techniques

    —

    Change log

    1. Fix✗ → ✓

    For records you follow, these changes also arrive as notifications. →

    References

    Show all references (19 more)

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

    All records