CVE-2026-74648 (CVSS 7.8)

Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: validate monitor transmit frame lengths rtw_cfg80211_monitor_if_xmit_entry() removes the radiotap header and then reads the 802.11 frame control field without checking that a base 802.11 header remains. The data path also pulls the calculated 802.11, QoS and SNAP header span before confirming that the skb contains it. A truncated frame can therefore cause out-of-bounds reads or leave insufficient data for the Ethernet address writes. Reject frames that do not contain the base 802.11 header and data frames that do not contain their complete calculated header span.

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/6829665d050983907b560173e49dcc6c11cb2730 https://git.kernel.org/stable/c/7b0f62d2986a28e5e4188366bc2f4e2868b14790 https://git.kernel.org/stable/c/7edd3adb0c80d70b4237640275c559610f438476 https://git.kernel.org/stable/c/8b3e4ed9c35d3d3b64fcc23f4a1f22b37c1865b1 https://git.kernel.org/stable/c/a3ac6d849de5f7abe14761d741bbb843ac793454 https://git.kernel.org/stable/c/bd88f6289b7e483216a9c1df15a0460ef9b02cb6 https://git.kernel.org/stable/c/c5e5d78743992e235b76d2ebe5a403d60315aa8a https://git.kernel.org/stable/c/f03398d835f5249c49546f0eb0d0df6792b95d5f

Frequently Asked Questions

What is CVE-2026-74648? +

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: validate monitor transmit frame lengths rtw_cfg80211_monitor_if_xmit_entry() removes the radiotap header and then reads the 802.11 frame control field without checking that a base 802.11 header remains. The data path also pulls the calculated 802.11, QoS and SNAP header span before confirming that the skb contains it. A truncated frame can therefore cause out-of-bounds reads or leave insufficient data for the Ethernet address writes. Reject frames that do not contain the base 802.11 header and data frames that do not contain their complete calculated header span. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-74648? +

CVE-2026-74648 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-74648? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-74648