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…

Description

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.

Scores

EPSS (exploitation in 30 days)

1.5% · top 25% of all CVEs (4 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.

Weakness

• n/a
• CWE-119 (opens in a new tab)All about CWE-119 and its CVEs

Affected products

• n/a

  • affected n/a

References (13)

• ADV-2009-1925 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• http://isc.sans.org/diary.html?storyid=6820 (opens in a new tab)x_refsource_MISCx_transferred
• http://grsecurity.net/~spender/cheddar_bay.tgz (opens in a new tab)x_refsource_MISCx_transferred
• [oss-security] 20090717 Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 20090716 Re: Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
• linux-kernel-tunchrpoll-code-execution(51803) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
• [netdev] 20090409 Oops in tun: bisected to Limit amount of queued packets per device (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 35839 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=3c8a9c63d5fd738c261bd0ceece04d9c8357ca13 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://bugzilla.redhat.com/show_bug.cgi?id=512284 (opens in a new tab)x_refsource_CONFIRMx_transferred
• [linux-kernel] 20090706 Re: PROBLEM: tun/tap crashes if open() /dev/net/tun and then poll() it. (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 20090716 Linux 2.6.30+/SELinux/RHEL5 test kernel 0day, exploiting the unexploitable (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
• https://www.redhat.com/en/blog/security-flaws-caused-compiler-optimizations (opens in a new tab)x_refsource_MISCx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2009-1897](https://trackcve.app/badge/CVE-2009-1897.svg)](https://trackcve.app/cve/CVE-2009-1897)

Record last updated 7 Aug 2024, 05:27 UTC.