Answer in brief
CVE-2025-21669 records a High severity (CVSS 7.8) 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.
CVSS is 7.8. 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
Oct 15, 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.