CVE-2026-68411 (GCVE-0-2026-68411)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:04 – Updated: 2026-08-19 16:35
VLAI
Title
wifi: mac80211_hwsim: clamp virtio RX length before skb_put
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211_hwsim: clamp virtio RX length before skb_put hwsim_virtio_rx_work() passes the virtqueue used-ring length reported by the device straight to skb_put() on a fixed-size receive skb. A backend reporting a length larger than the skb tailroom drives skb_put() past the buffer end and hits skb_over_panic() -- a host-triggerable guest panic (denial of service). Clamp the length to the skb's available room before skb_put(). A conforming device never reports more than the posted buffer size, so valid frames are unaffected; a truncated over-report then fails the length/header checks in hwsim_virtio_handle_cmd() and is dropped, so truncating rather than dropping here cannot be turned into a parsing problem.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 7f9d678b870fca8eaf1d46fa915cba0b1d5b387a (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 909573d6a9b67354fc0515952574564e7c909c62 (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 5779e4a33e1666ddfeba43e96e29c4a9e5254ff0 (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 82c5a30a66e2a7337d99476c67d6fc1a99c4250e (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < fade308845c89f784da8a6780c1e77258488f1b6 (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 6dc76371a9a360c29de00df5b11563102d9d675a (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 99dc05c75acc3c8cde8d89c5371f4b569de5ac62 (git)
Affected: 5d44fe7c9808c56e136e59147bd932f5491520f1 , < 10a2b430f8f06ae14b9590b6f6faa6b588ef0654 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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      "cpeApplicability": [
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211_hwsim: clamp virtio RX length before skb_put\n\nhwsim_virtio_rx_work() passes the virtqueue used-ring length reported by\nthe device straight to skb_put() on a fixed-size receive skb. A backend\nreporting a length larger than the skb tailroom drives skb_put() past the\nbuffer end and hits skb_over_panic() -- a host-triggerable guest panic\n(denial of service).\n\nClamp the length to the skb\u0027s available room before skb_put(). A\nconforming device never reports more than the posted buffer size, so valid\nframes are unaffected; a truncated over-report then fails the\nlength/header checks in hwsim_virtio_handle_cmd() and is dropped, so\ntruncating rather than dropping here cannot be turned into a parsing\nproblem."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:35:07.403Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/7f9d678b870fca8eaf1d46fa915cba0b1d5b387a"
        },
        {
          "url": "https://git.kernel.org/stable/c/909573d6a9b67354fc0515952574564e7c909c62"
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          "url": "https://git.kernel.org/stable/c/5779e4a33e1666ddfeba43e96e29c4a9e5254ff0"
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    "cveId": "CVE-2026-68411",
    "datePublished": "2026-08-10T12:04:31.532Z",
    "dateReserved": "2026-07-30T09:28:09.391Z",
    "dateUpdated": "2026-08-19T16:35:07.403Z",
    "state": "PUBLISHED"
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        "descriptions": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211_hwsim: clamp virtio RX length before skb_put\n\nhwsim_virtio_rx_work() passes the virtqueue used-ring length reported by\nthe device straight to skb_put() on a fixed-size receive skb. A backend\nreporting a length larger than the skb tailroom drives skb_put() past the\nbuffer end and hits skb_over_panic() -- a host-triggerable guest panic\n(denial of service).\n\nClamp the length to the skb\u0027s available room before skb_put(). A\nconforming device never reports more than the posted buffer size, so valid\nframes are unaffected; a truncated over-report then fails the\nlength/header checks in hwsim_virtio_handle_cmd() and is dropped, so\ntruncating rather than dropping here cannot be turned into a parsing\nproblem."
          }
        ],
        "id": "CVE-2026-68411",
        "lastModified": "2026-08-19T17:20:48.810",
        "metrics": {},
        "published": "2026-08-10T13:20:34.787",
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          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-11T09:42:16+00:00",
      "cve": "CVE-2026-68411",
      "id": "CVE-2026-68411",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mac80211_hwsim: clamp virtio RX length before skb_put",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68411.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-15T01:34:24Z",
      "cve": "CVE-2026-68411",
      "id": "CVE-2026-68411",
      "initial_release_date": "2026-08-11T23:46:14Z",
      "product_status:known_affected": "253",
      "product_status:known_not_affected": "121",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68411",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68411.json",
      "version": "4"
    }
  }
}



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