CVE-2012-6547

Severity: low (CVSS 1.9 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-03-15 · updated 2026-06-16
Weakness: CWE-200

Description

The __tun_chr_ioctl function in drivers/net/tun.c in the Linux kernel before 3.6 does not initialize a certain structure, which allows local users to obtain sensitive information from kernel stack memory via a crafted application.

Affected products

Linux kernel: through 3.5.7; 3.0-rc1, 3.0-rc2, 3.0-rc3, 3.0-rc4, 3.0-rc5, 3.0-rc6 (+183)

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc
http://rhn.redhat.com/errata/RHSA-2013-0744.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:176
http://www.openwall.com/lists/oss-security/2013/03/05/13
https://github.com/torvalds/linux/commit/a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc
https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.6.bz2
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc
http://rhn.redhat.com/errata/RHSA-2013-0744.html
http://www.mandriva.com/security/advisories?name=MDVSA-2013:176
http://www.openwall.com/lists/oss-security/2013/03/05/13
https://github.com/torvalds/linux/commit/a117dacde0288f3ec60b6e5bcedae8fa37ee0dfc
https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.6.bz2

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