Some weaknesses and a vulnerability have been reported in the Linux Kernel, which can be exploited by malicious, local users to disclose potentially sensitive information.
1) A vulnerability is caused due to wireless drivers potentially copying more kernel heap memory to userspace than intended, which can be exploited to disclose potentially sensitive information by e.g. sending a specially crafted "SIOCGIWESSID" IOCTL.
2) The "tcf_gact_dump()" function in net/sched/act_gact.c, the "tcf_mirred_dump()" function in net/sched/act_mirred.c, the "tcf_nat_dump()" function in net/sched/act_nat.c, the "tcf_simp_dump()" function in net/sched/act_simple.c, and the "tcf_skbedit_dump()" function in net/sched/act_skbedit.c are not properly initializing all members of certain structures before copying them to userspace, which can be exploited to disclose kernel stack memory.
3) The "tcf_act_police_dump()" function in net/sched/act_police.c is not properly initializing all members of a certain structure before copying it to userspace, which can be exploited to disclose kernel stack memory.
Solution: Update to version 2.6.36.
Provided and/or discovered by: 1) Reported as a grsecurity bug by jubidu. Additional information provided by Brad Spengler and the vendor.
2) Disclosed in a GIT commit.
3) Jeff Mahoney, SUSE
Original Advisory: 1) Jubidu:
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Subject: Linux Kernel Memory Leak Vulnerabilities
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