CVE-2024-42283: net: nexthop: Initialize all fields in dumped nexthops
First published: Sat Aug 17 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.3<5.4.282 | |
| Linux Linux kernel | >=5.5<5.10.224 | |
| Linux Linux kernel | >=5.11<5.15.165 | |
| Linux Linux kernel | >=5.16<6.1.103 | |
| Linux Linux kernel | >=6.2<6.6.44 | |
| Linux Linux kernel | >=6.7<6.10.3 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/1377de719652d868f5317ba8398b7e74c5f0430b
- https://git.kernel.org/stable/c/5cc4d71dda2dd4f1520f40e634a527022e48ccd8
- https://git.kernel.org/stable/c/6d745cd0e9720282cd291d36b9db528aea18add2
- https://git.kernel.org/stable/c/7704460acd7f5d35eb07c52500987dc9b95313fb
- https://git.kernel.org/stable/c/9e8f558a3afe99ce51a642ce0d3637ddc2b5d5d0
- https://git.kernel.org/stable/c/a13d3864b76ac87085ec530b2ff8e37482a63a96
- https://git.kernel.org/stable/c/fd06cb4a5fc7bda3dea31712618a62af72a1c6cb
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-42283
- https://nvd.nist.gov/vuln/detail/CVE-2024-42283
- https://launchpad.net/bugs/cve/CVE-2024-42283
- https://security-tracker.debian.org/tracker/CVE-2024-42283
- https://ubuntu.com/security/CVE-2024-42283
- https://git.kernel.org/linus/6d745cd0e9720282cd291d36b9db528aea18add2
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