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CVE-2026-64444
staging: rtl8723bs: fix OOB read in OnAssocRsp() IE loop
Published 2026-07-25 (3 months ago) by the Linux kernel CNA. Subsystem drivers/staging. Debian urgency: not yet assigned.
What to do, per Debian release
Debian's own status for CVE-2026-64444 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source
| Release | Status | Version | What this means |
|---|---|---|---|
| Debian 12bookworm | fixedDLA-4720-1 · 2026-08-05 · text | 6.1.180-1 | Update the kernel and reboot. DLA-4720-1 shipped the fix on 2026-08-05, in 6.1.180-1. A running kernel keeps the old code until the machine restarts. |
| Debian 13trixie | fixed | 6.12.96-1 | Update the kernel and reboot. Fixed in 6.12.96-1. A running kernel keeps the old code until the machine restarts. |
| Debian 14forky | fixed | 7.1.4-1 | Update the kernel and reboot. Fixed in 7.1.4-1. A running kernel keeps the old code until the machine restarts. |
| Debian unstablesid | fixed | 7.1.4-1 | Update the kernel and reboot. Fixed in 7.1.4-1. A running kernel keeps the old code until the machine restarts. |
| Debian 12bookworm · linux-6.12 | fixedDLA-4724-1 · 2026-08-07 · text | 6.12.100-1~deb12u1 | Update the kernel and reboot. DLA-4724-1 shipped the fix on 2026-08-07, in 6.12.100-1~deb12u1. A running kernel keeps the old code until the machine restarts. |
The vulnerability
What the bug is
The IE parsing loop in OnAssocRsp() advances by (pIE->length + 2) each iteration but only guards on i < pkt_len. When a malicious AP sends an AssocResponse whose last IE has only one byte remaining in the frame (the element_id byte lands at pkt_len-1), the loop reads pIE->length from pframe[pkt_len], which is one byte past the allocated receive buffer. Additionally, even when the header bytes are in bounds, pIE->length itself can extend the data window beyond pkt_len, silently passing a truncated IE to the handler functions. Add two guards at the top of the loop body: 1. Break if fewer than sizeof(*pIE) bytes remain (can't read header). 2. Break if the IE's declared data extends past pkt_len.
Where it lives
The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
- What this is
- STAGING SUBSYSTEMMAINTAINERS section matched on drivers/staging/ · linux-staging@lists.linux.dev · Supported
Show whether Debian builds this, per release
Not established. This site could not find the build rule for the affected file in the kernel trees Debian ships, so it has no answer about whether Debian compiles this code. Read that as unknown, never as absent.
- bookworm, trixie, forky, sid, bookworm · linux-6.12?
- ?
- not established - no Makefile entry for the affected file
Where a release above reads "not established", no build rule for the affected file was found in that release's kernel tree. That is a gap in this lookup, not a finding that the code is absent.
From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS
Signals
- Published
- 2026-07-25 (3 months ago)source
- CVSS
- 8.1 high
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Hsource recompute it - Attack vector
- adjacent network (AV:A)source
- EPSS
- 0.28%, higher than 19.1% of all CVEssource
- CISA KEV
- not listedthe KEV catalogue
- Debian urgency
- not yet assignedsource
- Subsystem
- drivers/staging
Upstream fixes
The versions the CNA records as introducing and fixing this, and the commit for each. source
| Introduced | Fixed in | Commit |
|---|---|---|
| 4.12 | 5.15.212 | 889ca6000ac7 |
| 4.12 | 6.1.178 | 1a52a0547149 |
| 4.12 | 6.6.145 | 0406d746574e |
| 4.12 | 6.12.96 | 0970dd47726a |
| 4.12 | 6.18.39 | 04f612dc0342 |
| 4.12 | 7.1.4 | 7e7741c8315e |
| 4.12 | 7.2 | f9654207e922 |
Debian advisories
| Advisory | Date | Shipped to | Debian |
|---|---|---|---|
| DLA-4724-1 | 2026-08-07 | bookworm 6.12.100-1~deb12u1 | tracker |
| DLA-4723-1 | 2026-08-07 | bullseye 6.1.180-1~deb11u1 | tracker |
| DLA-4720-1 | 2026-08-05 | bookworm 6.1.180-1 | tracker |
Why the CNA scored it this way
Quoted from the kernel CNA's own scoring file, word for word. A highlighted metric carries the most severe value CVSS v3.1 defines for it, which is what pushes the score up. source
- AV:AAttack vector, adjacent network
- An attacker within WiFi radio range can inject a spoofed 802.11 association response to an RTL8723BS station. WiFi management-frame injection is an adjacent attack vector.
- AC:LAttack complexity, low
- The malformed final IE or oversized declared IE deterministically triggers the faulty parsing, and the attacker can observe and answer an association request. No race or condition outside attacker control is required.
- PR:NPrivileges required, none
- Association responses are processed before WPA or 802.1X key establishment, without credentials or capabilities. The path checks the destination and association state but does not validate the response source or BSSID.
- UI:NUser interaction, none
- Auto-connecting phones, embedded devices, and IoT systems associate or reassociate without human action. An attacker can wait for or induce an automatic reconnect.
- S:UScope, unchanged
- The vulnerable driver and affected kernel resources belong to the same security authority. No VM, sandbox, or IOMMU boundary is crossed.
- C:HConfidentiality impact, high
- Truncated HT or WMM elements can make handlers consume up to approximately 26 bytes beyond the logical receive frame from adjacent kernel skb memory. Under the required conservative treatment of a nontrivial out-of-bounds read, confidentiality impact is High.
- I:NIntegrity impact, none
- This flaw performs out-of-bounds reads but provides no out-of-bounds write or control-flow primitive. The separate HT capability overwrite was already fixed in the upstream parent and is not attributed to this CVE.
- A:HAvailability impact, high
- Out-of-bounds accesses in the kernel receive tasklet can produce an oops or panic on hardened or unfavorable memory layouts. An unauthenticated adjacent attacker can repeat the trigger during association or reassociation.