CVE-2022-49309
drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Timeline
ID reserved
By Linux
Published
- 18 months later
· 18 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.20% · top 90% of all CVEs (7 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected fb127a61c9d8dfd9b370ee173344d01711f3c698 – < c84e5c819600ee0628f61b33d145258ae0f3d7a7
- affected fb127a61c9d8dfd9b370ee173344d01711f3c698 – < f89f6c3ebf69623b8ea48200bd690e9e210335a1
- affected fb127a61c9d8dfd9b370ee173344d01711f3c698 – < ce129d3efd181da5fd56f4360cc8827122afa67e
- affected fb127a61c9d8dfd9b370ee173344d01711f3c698 – < 2c41f5c341853f84b7bc2f32605d4e2782e8c279
- affected fb127a61c9d8dfd9b370ee173344d01711f3c698 – < cc7ad0d77b51c872d629bcd98aea463a3c4109e7
- affected 5.10
- unaffected < 5.10
- unaffected 5.10.237 – ≤ 5.10.*
- unaffected 5.15.47 – ≤ 5.15.*
- unaffected 5.17.15 – ≤ 5.17.*
- unaffected 5.18.4 – ≤ 5.18.*
- unaffected 5.19 – ≤ *
References (6)
- https://git.kernel.org/stable/c/c84e5c819600ee0628f61b33d145258ae0f3d7a7 (opens in a new tab)
- https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1 (opens in a new tab)
- https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e (opens in a new tab)
- https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279 (opens in a new tab)
- https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49309)Record last updated .