CVE-2026-68411

Guest kernel panic via oversized virtio RX length

Published Aug 10, 2026 · Updated Aug 10, 2026

Out-of-bounds write in Linux mac80211_hwsim allows attackers to crash a guest kernel via an oversized virtio RX length. hwsim_virtio_rx_work() passes the backend-reported used-ring length directly to skb_put() on a fixed-size receive skb, so a value beyond the tailroom reaches skb_over_panic(). The attacker must control the host-side virtio backend; the demonstrated consequence is a guest panic, with no reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Linux mac80211_hwsim allows attackers to crash a guest kernel via an oversized virtio RX length. hwsim_virtio_rx_work() passes the backend-reported used-ring length directly to skb_put() on a fixed-size receive skb, so a value beyond the tailroom reaches skb_over_panic(). The attacker must control the host-side virtio backend; the demonstrated consequence is a guest panic, with no reported data disclosure or modification.

The record

CVE
CVE-2026-68411
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.7
  2. Affected versionversion=5d44fe7c9808c56e136e59147bd932f5491520f1 <10a2b430f8f06ae14b9590b6f6faa6b588ef0654
  3. Affected versionversion=5d44fe7c9808c56e136e59147bd932f5491520f1 <6dc76371a9a360c29de00df5b11563102d9d675a
  4. Affected versionversion=5d44fe7c9808c56e136e59147bd932f5491520f1 <82c5a30a66e2a7337d99476c67d6fc1a99c4250e
  5. Affected versionversion=5d44fe7c9808c56e136e59147bd932f5491520f1 <99dc05c75acc3c8cde8d89c5371f4b569de5ac62
  6. Affected versionversion=5d44fe7c9808c56e136e59147bd932f5491520f1 <fade308845c89f784da8a6780c1e77258488f1b6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=5d44fe7c9808c56e136e59147bd932f5491520f1 <10a2b430f8f06ae14b9590b6f6faa6b588ef0654; version=5d44fe7c9808c56e136e59147bd932f5491520f1 <6dc76371a9a360c29de00df5b11563102d9d675a; version=5d44fe7c9808c56e136e59147bd932f5491520f1 <82c5a30a66e2a7337d99476c67d6fc1a99c4250e; version=5d44fe7c9808c56e136e59147bd932f5491520f1 <99dc05c75acc3c8cde8d89c5371f4b569de5ac62; version=5d44fe7c9808c56e136e59147bd932f5491520f1 <fade308845c89f784da8a6780c1e77258488f1b6

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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