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Vulnerability CVE-2024-42283
Published: 2024-08-17
| Description: |
In the Linux kernel, the following vulnerability has been resolved:
net: nexthop: Initialize all fields in dumped nexthops
struct nexthop_grp contains two reserved fields that are not initialized by
nla_put_nh_group(), and carry garbage. This can be observed e.g. with
strace (edited for clarity):
# ip nexthop add id 1 dev lo
# ip nexthop add id 101 group 1
# strace -e recvmsg ip nexthop get id 101
...
recvmsg(... [{nla_len=12, nla_type=NHA_GROUP},
[{id=1, weight=0, resvd1=0x69, resvd2=0x67}]] ...) = 52
The fields are reserved and therefore not currently used. But as they are, they
leak kernel memory, and the fact they are not just zero complicates repurposing
of the fields for new ends. Initialize the full structure. |
References: |
https://git.kernel.org/stable/c/1377de719652d868f5317ba8398b7e74c5f0430b
https://git.kernel.org/stable/c/7704460acd7f5d35eb07c52500987dc9b95313fb
https://git.kernel.org/stable/c/a13d3864b76ac87085ec530b2ff8e37482a63a96
https://git.kernel.org/stable/c/6d745cd0e9720282cd291d36b9db528aea18add2
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