media: mxl111sf: change mutex_init() location
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-908 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: media: mxl111sf: change mutex_init() location Syzbot reported, that mxl111sf_ctrl_msg() uses uninitialized mutex. The problem was in wrong mutex_init() location. Previous mutex_init(&state->msg_lock) call was in ->init() function, but dvb_usbv2_init() has this order of calls: dvb_usbv2_init() dvb_usbv2_adapter_init() dvb_usbv2_adapter_frontend_init() props->frontend_attach() props->init() Since mxl111sf_* devices call mxl111sf_ctrl_msg() in ->frontend_attach() internally we need to initialize state->msg_lock before frontend_attach(). To achieve it, ->probe() call added to all mxl111sf_* devices, which will simply initiaize mutex.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.7 and later | 4.19.222, 5.4.168, 5.10.88, 5.15.11, 5.16 | Patch available | CNA |
- Linux VendorLinux Affected 3.7 and later Fixed in 4.19.222, 5.4.168, 5.10.88, 5.15.11, 5.16 Patch available CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.7 to before 4.19.222; 4.20 to before 5.4.168; 5.5 to before 5.10.88; 5.11 to before 5.15.11 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.7 to before 4.19.222; 4.20 to before 5.4.168; 5.5 to before 5.10.88; 5.11 to before 5.15.11 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.19.222, 5.4.168, 5.10.88, 5.15.11, 5.16
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47583
- 2026-10-03 Alias added: GHSA-hfwg-2mm4-h8c4
References
Patch 5
- https://git.kernel.org/stable/c/4b2d9600b31f9ba7adbc9f3c54a068615d27b390
- https://git.kernel.org/stable/c/96f182c9f48b984447741f054ec301fdc8517035
- https://git.kernel.org/stable/c/b99bdf127af91d53919e96292c05f737c45ea59a
- https://git.kernel.org/stable/c/8c6fdf62bfe1bc72bfceeaf832ef7499c7ed09ba
- https://git.kernel.org/stable/c/44870a9e7a3c24acbb3f888b2a7cc22c9bdf7e7f
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- TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
Sources
- CVE-2021-47583 · CVE Program
- CVE-2021-47583 · NVD
- FIRST EPSS
- GHSA-hfwg-2mm4-h8c4 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-47583 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences