Answer in brief
CVE-2021-47307 records a High severity (CVSS 7.5) vulnerability in cifs: prevent NULL deref in cifs_compose_mount_options(). 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.
CVSS is 7.5. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2c55608f28444c3f33b10312881384c470ceed56 <f7d1fa65e74263d11f90ddd33b4d4cd905a93759 || >=2c55608f28444c3f33b10312881384c470ceed56 <e58c162789becede894d3e94c0ce6695a2ef5796 || >=2c55608f28444c3f33b10312881384c470ceed56 <ae3d181f4e912f51af7776ea165f199b16fc165d || >=2c55608f28444c3f33b10312881384c470ceed56 <03313d1c3a2f086bb60920607ab79ac8f8578306 | f7d1fa65e74263d11f90ddd33b4d4cd905a93759, e58c162789becede894d3e94c0ce6695a2ef5796, ae3d181f4e912f51af7776ea165f199b16fc165d, 03313d1c3a2f086bb60920607ab79ac8f8578306 |
| Linux/Linuxgeneric | 2.6.28 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL deref in cifs_compose_mount_options() The optional @ref parameter might contain an NULL node_name, so prevent dereferencing it in cifs_compose_mount_options(). Addresses-Coverity: 1476408 ("Explicit null dereferenced")
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2021-47307 records a High severity (CVSS 7.5) vulnerability in cifs: prevent NULL deref in cifs_compose_mount_options(). 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.
CVSS is 7.5. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2c55608f28444c3f33b10312881384c470ceed56 <f7d1fa65e74263d11f90ddd33b4d4cd905a93759 || >=2c55608f28444c3f33b10312881384c470ceed56 <e58c162789becede894d3e94c0ce6695a2ef5796 || >=2c55608f28444c3f33b10312881384c470ceed56 <ae3d181f4e912f51af7776ea165f199b16fc165d || >=2c55608f28444c3f33b10312881384c470ceed56 <03313d1c3a2f086bb60920607ab79ac8f8578306 | f7d1fa65e74263d11f90ddd33b4d4cd905a93759, e58c162789becede894d3e94c0ce6695a2ef5796, ae3d181f4e912f51af7776ea165f199b16fc165d, 03313d1c3a2f086bb60920607ab79ac8f8578306 |
| Linux/Linuxgeneric | 2.6.28 | Not reported |
Published upstream
May 21, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
In the Linux kernel, the following vulnerability has been resolved: cifs: prevent NULL deref in cifs_compose_mount_options() The optional @ref parameter might contain an NULL node_name, so prevent dereferencing it in cifs_compose_mount_options(). Addresses-Coverity: 1476408 ("Explicit null dereferenced")
Quoted source text, attributed separately from HOL analysis.