GHSA-MC29-R954-2M26
Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-10-03 12:31In the Linux kernel, the following vulnerability has been resolved:
drop_monitor: fix size calculations for 64-bit attributes
net_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use nla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and NET_DM_ATTR_TIMESTAMP).
On 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS, nla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for 64-bit alignment.
However, net_dm_packet_report_size() and net_dm_hw_packet_report_size() used nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)), budgeting 12 bytes instead of up to 16 bytes.
This under-estimation of SKB size can lead to an skb_over_panic() when __nla_reserve() or skb_put() is subsequently called.
Fix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations.
{
"affected": [],
"aliases": [
"CVE-2026-68287"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-10T13:20:18Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrop_monitor: fix size calculations for 64-bit attributes\n\nnet_dm_packet_report_fill() and net_dm_hw_packet_report_fill() use\nnla_put_u64_64bit() to append 64-bit attributes (NET_DM_ATTR_PC and\nNET_DM_ATTR_TIMESTAMP).\n\nOn 32-bit architectures without CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS,\nnla_put_u64_64bit() may append a 4-byte NET_DM_ATTR_PAD attribute for\n64-bit alignment.\n\nHowever, net_dm_packet_report_size() and net_dm_hw_packet_report_size()\nused nla_total_size(sizeof(u64)) instead of nla_total_size_64bit(sizeof(u64)),\nbudgeting 12 bytes instead of up to 16 bytes.\n\nThis under-estimation of SKB size can lead to an skb_over_panic() when\n__nla_reserve() or skb_put() is subsequently called.\n\nFix this by using nla_total_size_64bit(sizeof(u64)) in both size calculations.",
"id": "GHSA-mc29-r954-2m26",
"modified": "2026-10-03T12:31:02Z",
"published": "2026-08-10T15:33:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68287"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0da8f531336b28a59b23e5a67d40eaed15906201"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1275a4769c126405c6c63b6372daff120ac679a6"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6048ed2dfb33426c8aef32f8d225ea91c66813db"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/925669d4cfd47a9019ab29b40676215bab5dae35"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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