The (1) BPF_S_ANC_NLATTR and (2) BPF_S_ANC_NLATTR_NEST...
Moderate severity
Unreviewed
Published
May 13, 2022
to the GitHub Advisory Database
•
Updated Feb 20, 2023
Description
Published by the National Vulnerability Database
May 11, 2014
Published to the GitHub Advisory Database
May 13, 2022
Last updated
Feb 20, 2023
The (1) BPF_S_ANC_NLATTR and (2) BPF_S_ANC_NLATTR_NEST extension implementations in the sk_run_filter function in net/core/filter.c in the Linux kernel through 3.14.3 do not check whether a certain length value is sufficiently large, which allows local users to cause a denial of service (integer underflow and system crash) via crafted BPF instructions. NOTE: the affected code was moved to the __skb_get_nlattr and __skb_get_nlattr_nest functions before the vulnerability was announced.
References