ghsa-j7w3-jhcq-frvr
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
ibmvnic: Add tx check to prevent skb leak
Below is a summary of how the driver stores a reference to an skb during
transmit:
tx_buff[free_map[consumer_index]]->skb = new_skb;
free_map[consumer_index] = IBMVNIC_INVALID_MAP;
consumer_index ++;
Where variable data looks like this:
free_map == [4, IBMVNIC_INVALID_MAP, IBMVNIC_INVALID_MAP, 0, 3]
consumer_index^
tx_buff == [skb=null, skb=
The driver has checks to ensure that free_map[consumer_index] pointed to a valid index but there was no check to ensure that this index pointed to an unused/null skb address. So, if, by some chance, our free_map and tx_buff lists become out of sync then we were previously risking an skb memory leak. This could then cause tcp congestion control to stop sending packets, eventually leading to ETIMEDOUT.
Therefore, add a conditional to ensure that the skb address is null. If not then warn the user (because this is still a bug that should be patched) and free the old pointer to prevent memleak/tcp problems.
{
"affected": [],
"aliases": [
"CVE-2024-41066"
],
"database_specific": {
"cwe_ids": [
"CWE-401"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-07-29T15:15:14Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nibmvnic: Add tx check to prevent skb leak\n\nBelow is a summary of how the driver stores a reference to an skb during\ntransmit:\n tx_buff[free_map[consumer_index]]-\u003eskb = new_skb;\n free_map[consumer_index] = IBMVNIC_INVALID_MAP;\n consumer_index ++;\nWhere variable data looks like this:\n free_map == [4, IBMVNIC_INVALID_MAP, IBMVNIC_INVALID_MAP, 0, 3]\n \tconsumer_index^\n tx_buff == [skb=null, skb=\u003cptr\u003e, skb=\u003cptr\u003e, skb=null, skb=null]\n\nThe driver has checks to ensure that free_map[consumer_index] pointed to\na valid index but there was no check to ensure that this index pointed\nto an unused/null skb address. So, if, by some chance, our free_map and\ntx_buff lists become out of sync then we were previously risking an\nskb memory leak. This could then cause tcp congestion control to stop\nsending packets, eventually leading to ETIMEDOUT.\n\nTherefore, add a conditional to ensure that the skb address is null. If\nnot then warn the user (because this is still a bug that should be\npatched) and free the old pointer to prevent memleak/tcp problems.",
"id": "GHSA-j7w3-jhcq-frvr",
"modified": "2024-09-10T18:30:42Z",
"published": "2024-07-29T15:30:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-41066"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0983d288caf984de0202c66641577b739caad561"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/16ad1557cae582e79bb82dddd612d9bdfaa11d4c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/267c61c4afed0ff9a2e83462abad3f41d8ca1f06"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e7b75def33eae61ddaad6cb616c517dc3882eb2a"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.