CVE-2009-1935: n/a vulnerability

CVE-2009-1935: Integer overflow in the pipe_build_write_buffer function (sys/kern/sys_pipe.c) in the direct write optimiza...

Integer overflow in the pipe_build_write_buffer function (sys/kern/sys_pipe.c) in the direct write optimization feature in the pipe implementation in FreeBSD 7.1 through 7.2 and 6.3 through 6.4 allows local users to bypass virtual-to-physical address lookups and read sensitive information in memory pages via unspecified vectors.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 05:27 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2009-1935 is an old FreeBSD kernel information-disclosure flaw. A local account on affected FreeBSD 6.3-6.4 or 7.1-7.2 systems could read sensitive memory pages because a pipe optimization mishandled integer overflow. Business urgency depends on whether those obsolete FreeBSD versions still exist in production, appliances, or legacy hosting environments. Likely exposure is limited to systems running FreeBSD 7.1 through 7.2 or 6.3 through 6.4, including embedded products based on those releases. The source bundle does not identify other products or CPEs, so treat appliance exposure as an inventory question, not an assumption. Prioritize this as a legacy exposure cleanup item, not an internet-wide emergency. It becomes more urgent where untrusted users can log into affected FreeBSD hosts or where old FreeBSD versions underpin business-critical appliances handling sensitive data. Mitigation focus: Identify any FreeBSD 6.3-6.4 or 7.1-7.2 systems.; Review FreeBSD-SA-09:09 and apply vendor-supported fixes or upgrades.; Use the referenced FreeBSD pipe patch only per vendor guidance..

Prepared: Jun 28, 2026, 10:45 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 18, 2009, 18:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
freebsd-directpipe-info-disclosure(51109)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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