CVE-2026-68411
wifi: mac80211_hwsim: clamp virtio RX length before skb_put
Description
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.
INFO
Published Date :
Aug. 10, 2026, 1:20 p.m.
Last Modified :
Aug. 10, 2026, 1:20 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-68411
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Clamp RX length to skb tailroom.
- Apply kernel updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-68411.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68411 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-68411
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-68411 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68411 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5d44fe7c9808c56e136e59147bd932f5491520f1', 'lessThan': '82c5a30a66e2a7337d99476c67d6fc1a99c4250e', 'versionType': 'git'}, {'status': 'affected', 'version': '5d44fe7c9808c56e136e59147bd932f5491520f1', 'lessThan': 'fade308845c89f784da8a6780c1e77258488f1b6', 'versionType': 'git'}, {'status': 'affected', 'version': '5d44fe7c9808c56e136e59147bd932f5491520f1', 'lessThan': '6dc76371a9a360c29de00df5b11563102d9d675a', 'versionType': 'git'}, {'status': 'affected', 'version': '5d44fe7c9808c56e136e59147bd932f5491520f1', 'lessThan': '99dc05c75acc3c8cde8d89c5371f4b569de5ac62', 'versionType': 'git'}, {'status': 'affected', 'version': '5d44fe7c9808c56e136e59147bd932f5491520f1', 'lessThan': '10a2b430f8f06ae14b9590b6f6faa6b588ef0654', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/virtual/mac80211_hwsim_main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.7'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.7', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc4', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/virtual/mac80211_hwsim_main.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/10a2b430f8f06ae14b9590b6f6faa6b588ef0654 Added Reference https://git.kernel.org/stable/c/6dc76371a9a360c29de00df5b11563102d9d675a Added Reference https://git.kernel.org/stable/c/82c5a30a66e2a7337d99476c67d6fc1a99c4250e Added Reference https://git.kernel.org/stable/c/99dc05c75acc3c8cde8d89c5371f4b569de5ac62 Added Reference https://git.kernel.org/stable/c/fade308845c89f784da8a6780c1e77258488f1b6