GHSA-MC29-R954-2M26

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-14 00:31
VLAI
Details

In 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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
To clipboard 

{
  "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": "2026-08-14T00:31:54Z",
  "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/4a9e30764e80693bcf875c776170edce20f94fe0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"
    }
  ],
  "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"
    }
  ]
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.