Answer in brief
CVE-2025-21669 records a Unknown severity vulnerability in vsock/virtio: discard packets if the transport changes. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-21669 records a Unknown severity vulnerability in vsock/virtio: discard packets if the transport changes. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. 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), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <18a7fc371d1dbf8deff16c2dd9292bcc73f43040 || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <6486915fa661584d70e8e7e4068c6c075c67dd6d || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <d88b249e14bd0ee1e46bbe4f456e22e01b8c68de || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <677579b641af109613564460a4e3bdcb16850b61 || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 | 18a7fc371d1dbf8deff16c2dd9292bcc73f43040, 6486915fa661584d70e8e7e4068c6c075c67dd6d, 88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee, d88b249e14bd0ee1e46bbe4f456e22e01b8c68de, 677579b641af109613564460a4e3bdcb16850b61, 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 |
| Linux/Linuxgeneric | 5.5 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Jan 31, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected and would cause issues when we access vsk->transport. A possible scenario is described by Hyunwoo Kim in the attached link, where after a first connect() interrupted by a signal, and a second connect() failed, we can find `vsk->transport` at NULL, leading to a NULL pointer dereference.
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. 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), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <18a7fc371d1dbf8deff16c2dd9292bcc73f43040 || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <6486915fa661584d70e8e7e4068c6c075c67dd6d || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <d88b249e14bd0ee1e46bbe4f456e22e01b8c68de || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <677579b641af109613564460a4e3bdcb16850b61 || >=c0cfa2d8a788fcf45df5bf4070ab2474c88d543a <2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 | 18a7fc371d1dbf8deff16c2dd9292bcc73f43040, 6486915fa661584d70e8e7e4068c6c075c67dd6d, 88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee, d88b249e14bd0ee1e46bbe4f456e22e01b8c68de, 677579b641af109613564460a4e3bdcb16850b61, 2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1 |
| Linux/Linuxgeneric | 5.5 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Jan 31, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: discard packets if the transport changes If the socket has been de-assigned or assigned to another transport, we must discard any packets received because they are not expected and would cause issues when we access vsk->transport. A possible scenario is described by Hyunwoo Kim in the attached link, where after a first connect() interrupted by a signal, and a second connect() failed, we can find `vsk->transport` at NULL, leading to a NULL pointer dereference.
Quoted source text, attributed separately from HOL analysis.