What’s Vulnerable › Vulnerabilities

CVE-2011-1776

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2011-09-06 · updated 2026-06-16
• Weakness: CWE-119

Description

The is_gpt_valid function in fs/partitions/efi.c in the Linux kernel before 2.6.39 does not check the size of an Extensible Firmware Interface (EFI) GUID Partition Table (GPT) entry, which allows physically proximate attackers to cause a denial of service (heap-based buffer overflow and OOPS) or obtain sensitive information from kernel heap memory by connecting a crafted GPT storage device, a different vulnerability than CVE-2011-1577.

Affected products

• Linux kernel: before 2.6.39 — fixed in 2.6.39
• RedHat Enterprise Linux Desktop: 5.0
• RedHat Enterprise Linux Server: 5.0
• RedHat Enterprise Linux Server Aus: 5.6
• RedHat Enterprise Linux Server Eus: 5.6
• RedHat Enterprise Linux Workstation: 5.0

How to fix

Upgrade to a fixed version: Linux kernel 2.6.39. Check the vendor advisory for mitigations.

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=fa039d5f6b126fbd65eefa05db2f67e44df8f121
• http://openwall.com/lists/oss-security/2011/05/10/4
• http://rhn.redhat.com/errata/RHSA-2011-0927.html
• http://securityreason.com/securityalert/8369
• http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.39
• http://www.pre-cert.de/advisories/PRE-SA-2011-04.txt
• http://www.securityfocus.com/bid/47796
• https://bugzilla.redhat.com/show_bug.cgi?id=703026
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=fa039d5f6b126fbd65eefa05db2f67e44df8f121
• http://openwall.com/lists/oss-security/2011/05/10/4
• http://rhn.redhat.com/errata/RHSA-2011-0927.html
• http://securityreason.com/securityalert/8369

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