drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback() (CVE-2022-49309) | HOL Guard CVE

Medium · CVSS 5.5CVE-2022-49309

drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()

Answer in brief

CVE-2022-49309 records a Medium severity (CVSS 5.5) vulnerability in drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Feb 26, 2025Updated Aug 13, 2026Source checked Sep 27, 2026First seen by HOL Aug 13, 2026Material review Aug 13, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.5
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=fb127a61c9d8dfd9b370ee173344d01711f3c698 <c84e5c819600ee0628f61b33d145258ae0f3d7a7 \|\| >=fb127a61c9d8dfd9b370ee173344d01711f3c698 <f89f6c3ebf69623b8ea48200bd690e9e210335a1 \|\| >=fb127a61c9d8dfd9b370ee173344d01711f3c698 <ce129d3efd181da5fd56f4360cc8827122afa67e \|\| >=fb127a61c9d8dfd9b370ee173344d01711f3c698 <2c41f5c341853f84b7bc2f32605d4e2782e8c279 \|\| >=fb127a61c9d8dfd9b370ee173344d01711f3c698 <cc7ad0d77b51c872d629bcd98aea463a3c4109e7	c84e5c819600ee0628f61b33d145258ae0f3d7a7, f89f6c3ebf69623b8ea48200bd690e9e210335a1, ce129d3efd181da5fd56f4360cc8827122afa67e, 2c41f5c341853f84b7bc2f32605d4e2782e8c279, cc7ad0d77b51c872d629bcd98aea463a3c4109e7
Linux/Linuxgeneric	5.10	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to c84e5c819600ee0628f61b33d145258ae0f3d7a7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Feb 26, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 13, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback() There is a deadlock in rtw_surveydone_event_callback(), which is shown below: (Thread 1) | (Thread 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ... We hold pmlmepriv->lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtw_surveydone_event_callback() will block forever. This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() in rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise, spin_lock_bh() will also cause deadlock() in timer handler.

Quoted source text, attributed separately from HOL analysis.