CVE-2011-2525

The qdisc_notify function in net/sched/sch_api.c in the Linux kernel before 2.6.35 does not prevent tc_fill_qdisc function calls referencing builtin (aka CQ_F_BUILTIN) Qdisc structures, which allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact via a crafted call.

Weakness

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

Affected Software

Potential Mitigations

References

• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=53b0f08042f04813cd1a7473dacd3edfacb28eb3
• http://kerneltrap.org/mailarchive/linux-netdev/2010/5/21/6277805
• http://mirror.anl.gov/pub/linux/kernel/v2.6/ChangeLog-2.6.35
• http://openwall.com/lists/oss-security/2011/07/12/1
• http://rhn.redhat.com/errata/RHSA-2011-1065.html
• http://rhn.redhat.com/errata/RHSA-2011-1163.html
• https://bugzilla.redhat.com/show_bug.cgi?id=720552
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=53b0f08042f04813cd1a7473dacd3edfacb28eb3
• http://kerneltrap.org/mailarchive/linux-netdev/2010/5/21/6277805
• http://mirror.anl.gov/pub/linux/kernel/v2.6/ChangeLog-2.6.35
• http://openwall.com/lists/oss-security/2011/07/12/1
• http://rhn.redhat.com/errata/RHSA-2011-1065.html
• http://rhn.redhat.com/errata/RHSA-2011-1163.html
• https://bugzilla.redhat.com/show_bug.cgi?id=720552