CVE-2011-3191

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2012-05-24 · updated 2026-06-16
Weakness: CWE-119

Description

Integer signedness error in the CIFSFindNext function in fs/cifs/cifssmb.c in the Linux kernel before 3.1 allows remote CIFS servers to cause a denial of service (memory corruption) or possibly have unspecified other impact via a large length value in a response to a read request for a directory.

Affected products

Linux kernel: before 3.0.5 — fixed in 3.0.5
Red Hat Enterprise Linux: 4.0

How to fix

Upgrade to a fixed version: Linux kernel 3.0.5. Check the vendor advisory for mitigations.

References

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=9438fabb73eb48055b58b89fc51e0bc4db22fabd
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
http://www.openwall.com/lists/oss-security/2011/08/24/2
https://bugzilla.redhat.com/show_bug.cgi?id=732869
https://github.com/torvalds/linux/commit/9438fabb73eb48055b58b89fc51e0bc4db22fabd
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=9438fabb73eb48055b58b89fc51e0bc4db22fabd
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.1
http://www.openwall.com/lists/oss-security/2011/08/24/2
https://bugzilla.redhat.com/show_bug.cgi?id=732869
https://github.com/torvalds/linux/commit/9438fabb73eb48055b58b89fc51e0bc4db22fabd

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