CVE-2009-1897: n/a vulnerability

CVE-2009-1897: 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...

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-pointer-checks gcc option is omitted, allows local users to gain privileges via vectors involving a NULL pointer dereference and an mmap of /dev/net/tun, a different vulnerability than CVE-2009-1894.

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

Security readout for executives and security teams

CVE-2009-1897 is an old Linux kernel local privilege-escalation flaw. A user who already has local access could potentially turn a kernel crash condition in the TUN/TAP networking driver into higher privileges on affected 2.6.30-era systems. Likely limited to legacy Linux 2.6.30/2.6.30.1 systems or vendor test/backport kernels matching the cited condition. Modern supported kernels are unlikely to be affected, but embedded, appliance, or abandoned systems should be checked. Treat as urgent only where old Linux kernels remain in production. The business risk is local takeover of legacy hosts, not broad remote compromise from current evidence. Mitigation focus: Inventory systems running Linux kernel 2.6.30 or 2.6.30.1.; Check vendor advisories for fixed kernel packages or supported upgrade paths.; Replace unsupported kernels with maintained vendor-supported releases..

Prepared: Jun 28, 2026, 10:26 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: Jul 20, 2009, 17:00 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

4Source 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
linux-kernel-tunchrpoll-code-execution(51803)CVE reference · vdb-entry, x_refsource_XF
https://bugzilla.redhat.com/show_bug.cgi?id=512284CVE reference · x_refsource_CONFIRM
https://www.redhat.com/en/blog/security-flaws-caused-compiler-optimizationsCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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