CVE-2026-68373
wifi: at76c50x-usb: avoid length underflow in at76_guess_freq()
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off.
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-2026-68373
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
- Update the Linux kernel to the latest version.
- Apply the security patch for the at76c50x-usb driver.
- Recompile and reboot the system if necessary.
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-2026-68373.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68373 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-2026-68373
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-2026-68373 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68373 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': '1264b951463a00efebe1bb596499aaad620ec8af', 'lessThan': 'e165a1d295e7e814e13b0f92c86e5d48309509ce', 'versionType': 'git'}, {'status': 'affected', 'version': '1264b951463a00efebe1bb596499aaad620ec8af', 'lessThan': 'bcde7249d45f52f994a9872bedf45994472ade77', 'versionType': 'git'}, {'status': 'affected', 'version': '1264b951463a00efebe1bb596499aaad620ec8af', 'lessThan': 'fb1b50ab699211e777dca5ccfb648788b6a6e519', 'versionType': 'git'}, {'status': 'affected', 'version': '1264b951463a00efebe1bb596499aaad620ec8af', 'lessThan': 'f742d9c98b5c504fc9e6744eef13a721c2aea486', 'versionType': 'git'}, {'status': 'affected', 'version': '1264b951463a00efebe1bb596499aaad620ec8af', 'lessThan': '61a799ffd1e5a4fd3702d547828b7ff3d161468e', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/atmel/at76c50x-usb.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.30'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.30', '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-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/atmel/at76c50x-usb.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: wifi: at76c50x-usb: avoid length underflow in at76_guess_freq() at76_guess_freq() checks only that the received frame is at least a bare 802.11 header (24 bytes) before subtracting the fixed management-body offset: len -= el_off; For both beacon and probe response frames, el_off is 36. If the frame is shorter than el_off, subtracting it causes the calculated IE length to wrap. The length is eventually passed to cfg80211_find_elem_match() as a very large unsigned value, so the element walk runs beyond the RX skb. This path is reached from at76_rx_tasklet() while scanning. If the device delivers a truncated beacon or probe response, the oversized IE length causes an out-of-bounds read during scanning. Skip the IE lookup if the frame does not reach the variable elements, before subtracting el_off. Added Reference https://git.kernel.org/stable/c/61a799ffd1e5a4fd3702d547828b7ff3d161468e Added Reference https://git.kernel.org/stable/c/bcde7249d45f52f994a9872bedf45994472ade77 Added Reference https://git.kernel.org/stable/c/e165a1d295e7e814e13b0f92c86e5d48309509ce Added Reference https://git.kernel.org/stable/c/f742d9c98b5c504fc9e6744eef13a721c2aea486 Added Reference https://git.kernel.org/stable/c/fb1b50ab699211e777dca5ccfb648788b6a6e519