scsi: core: Put LLD module refcnt after SCSI device is released
Priority LOW 24Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: core: Put LLD module refcnt after SCSI device is released SCSI host release is triggered when SCSI device is freed. We have to make sure that the low-level device driver module won't be unloaded before SCSI host instance is released because shost->hostt is required in the release handler. Make sure to put LLD module refcnt after SCSI device is released. Fixes a kernel panic of 'BUG: unable to handle page fault for address' reported by Changhui and Yi.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0021 11th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.4.292, 4.9.290, 4.14.255 +5Red Hat: 3 without a fix
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 | 2.6.16 and later | 4.4.292, 4.9.290, 4.14.255, 4.19.216, 5.4.158, 5.10.78, 5.14.17, 5.15 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.16 and later Fixed in 4.4.292, 4.9.290, 4.14.255, 4.19.216, 5.4.158, 5.10.78, 5.14.17, 5.15 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | before 4.4.292; 4.5 to before 4.9.290; 4.10 to before 4.14.255; 4.15 to before 4.19.216; 4.20 to before 5.4.158; 5.5 to before 5.10.78; 5.11 to before 5.14.17 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* | 5.15 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* | 5.15 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* | 5.15 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* | 5.15 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* | 5.15 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:* | 5.15 rc6 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions before 4.4.292; 4.5 to before 4.9.290; 4.10 to before 4.14.255; 4.15 to before 4.19.216; 4.20 to before 5.4.158; 5.5 to before 5.10.78; 5.11 to before 5.14.17 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:* Versions 5.15 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:* Versions 5.15 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:* Versions 5.15 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:* Versions 5.15 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:* Versions 5.15 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:* Versions 5.15 rc6 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.4.292, 4.9.290, 4.14.255, 4.19.216, 5.4.158, 5.10.78, 5.14.17, 5.15
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
Not affected: 2 products
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2021-47480
- 2026-10-03 Alias added: GHSA-wc2g-rvvj-x242
References
Patch 8
- https://git.kernel.org/stable/c/1105573d964f7b78734348466b01f5f6ba8a1813
- https://git.kernel.org/stable/c/8e4814a461787e15a31d322d9efbe0d4f6822428
- https://git.kernel.org/stable/c/61a0faa89f21861d1f8d059123b5c285a5d9ffee
- https://git.kernel.org/stable/c/c2df161f69fb1c67f63adbd193368b47f511edc0
- https://git.kernel.org/stable/c/1ce287eff9f23181d5644db787f472463a61f68b
- https://git.kernel.org/stable/c/7b57c38d12aed1b5d92f74748bed25e0d041729f
- https://git.kernel.org/stable/c/f30822c0b4c35ec86187ab055263943dc71a6836
- https://git.kernel.org/stable/c/f2b85040acec9a928b4eb1b57a989324e8e38d3f
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Sources
- CVE-2021-47480 · CVE Program
- CVE-2021-47480 · NVD
- FIRST EPSS
- GHSA-wc2g-rvvj-x242 · GitHub Advisory Database · CC BY 4.0
- CVE-2021-47480 · Red Hat security data · CC BY 4.0
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