CVE-2026-68287 (GCVE-0-2026-68287)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:02 – Updated: 2026-08-17 05:02
VLAI
Title
drop_monitor: fix size calculations for 64-bit attributes
Summary
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
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f , < 4a9e30764e80693bcf875c776170edce20f94fe0 (git)
Affected: ca30707dee2bc8bc81cfd8b4277fe90f7ca6df1f , < 7089f7ab99c89f443c92d8fcc585e63f2727f0b3 (git)
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Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "product": "Linux",
          "programFiles": [
            "net/core/drop_monitor.c"
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          "value": "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."
        }
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
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          "scenarios": [
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              "value": "AV:N - The report path runs in net/core/drop_monitor.c whenever a received packet is dropped or hardware-trapped; a remote unauthenticated attacker triggers it simply by sending packets that get dropped, and controls skb-\u003elen which feeds payload_len and thus the under-sized allocation.\nAC:L - On an affected build the attacker can drive the path at will, tuning packet length byte-by-byte to land the under-budgeted skb exactly at an allocator bucket boundary; no race or unpredictable state is involved.\nPR:N - Enabling packet-alert mode is the victim administrator\u0027s monitoring configuration; the attacker\u0027s own action is only sending packets that get dropped, which needs no account, credentials or privileges on the target.\nUI:N - The drop-report path is executed automatically by the kernel workqueue when packets are dropped; no local user action is needed.\nS:U - The under-allocated skb and the resulting skb_over_panic() are entirely within the kernel\u0027s own security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:N - __nla_reserve() detects the overrun in skb_put() and panics before any data is written or read past the buffer, so no memory contents are disclosed to the attacker.\nI:N - skb_over_panic() aborts before the out-of-bounds payload copy occurs, so no adjacent memory is modified and no control-flow primitive is obtained.\nA:H - The size under-estimation makes skb_put() exceed skb-\u003eend, invoking skb_over_panic() which calls BUG() and takes down the machine, a complete and repeatable denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:02:22.526Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/4a9e30764e80693bcf875c776170edce20f94fe0"
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          "url": "https://git.kernel.org/stable/c/7089f7ab99c89f443c92d8fcc585e63f2727f0b3"
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68287",
    "datePublished": "2026-08-10T12:02:20.110Z",
    "dateReserved": "2026-07-30T09:28:09.380Z",
    "dateUpdated": "2026-08-17T05:02:22.526Z",
    "state": "PUBLISHED"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-14T17:30:22+00:00",
      "cve": "CVE-2026-68287",
      "id": "CVE-2026-68287",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "233",
      "product_status:known_not_affected": "43",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drop_monitor: fix size calculations for 64-bit attributes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68287.json",
      "version": "3"
    }
  }
}



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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.

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