ghsa-2885-grqh-2673
Vulnerability from github
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.
{
"affected": [],
"aliases": [
"CVE-2024-57947"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-01-23T14:15:25Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_set_pipapo: fix initial map fill\n\nThe initial buffer has to be inited to all-ones, but it must restrict\nit to the size of the first field, not the total field size.\n\nAfter each round in the map search step, the result and the fill map\nare swapped, so if we have a set where f-\u003ebsize of the first element\nis smaller than m-\u003ebsize_max, those one-bits are leaked into future\nrounds result map.\n\nThis makes pipapo find an incorrect matching results for sets where\nfirst field size is not the largest.\n\nFollowup patch adds a test case to nft_concat_range.sh selftest script.\n\nThanks to Stefano Brivio for pointing out that we need to zero out\nthe remainder explicitly, only correcting memset() argument isn\u0027t enough.",
"id": "GHSA-2885-grqh-2673",
"modified": "2025-01-23T15:31:06Z",
"published": "2025-01-23T15:31:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-57947"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/69b6a67f7052905e928d75a0c5871de50e686986"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/791a615b7ad2258c560f91852be54b0480837c93"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/8058c88ac0df21239daee54b5934d5c80ca9685f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/957a4d1c4c5849e4515c9fb4db21bf85318103dc"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9625c46ce6fd4f922595a4b32b1de5066d70464f"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
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