- Vulnerability/
- CVE-2024-57947
CVE-2024-57947: netfilter: nf_set_pipapo: fix initial map fill
First published: Thu Jan 23 2025(Updated: )
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_set_pipapo: fix initial map fill The initial buffer has to be inited to all-ones, but it must restrict it to the size of the first field, not the total field size. After each round in the map search step, the result and the fill map are swapped, so if we have a set where f->bsize of the first element is smaller than m->bsize_max, those one-bits are leaked into future rounds result map. This makes pipapo find an incorrect matching results for sets where first field size is not the largest. Followup patch adds a test case to nft_concat_range.sh selftest script. Thanks to Stefano Brivio for pointing out that we need to zero out the remainder explicitly, only correcting memset() argument isn't enough.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel |
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Reference Links
- https://git.kernel.org/stable/c/957a4d1c4c5849e4515c9fb4db21bf85318103dc
- https://git.kernel.org/stable/c/9625c46ce6fd4f922595a4b32b1de5066d70464f
- https://git.kernel.org/stable/c/69b6a67f7052905e928d75a0c5871de50e686986
- https://git.kernel.org/stable/c/8058c88ac0df21239daee54b5934d5c80ca9685f
- https://git.kernel.org/stable/c/791a615b7ad2258c560f91852be54b0480837c93
Frequently Asked Questions
What is the severity of CVE-2024-57947?
CVE-2024-57947 has been rated as a moderate severity vulnerability.
How do I fix CVE-2024-57947?
To fix CVE-2024-57947, update your Linux kernel to the latest version where this vulnerability has been resolved.
What components are affected by CVE-2024-57947?
CVE-2024-57947 affects the netfilter component of the Linux kernel.
What is the impact of CVE-2024-57947?
The impact of CVE-2024-57947 may lead to improper initialization of buffers, potentially resulting in unstable behavior.
When was CVE-2024-57947 disclosed?
CVE-2024-57947 was disclosed in 2024 during routine security analysis of the Linux kernel.
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