vsock/virtio: discard packets if the transport changes
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.234, 5.15.177, 6.1.127, 6.12.11, 6.6.74
- CVEs
- CVE-2025-21669
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 16:36 UTC · Revision 1
Source evidence
vsock/virtio: discard packets if the transport changes
core-osv · Original sourcePublished 31 Jan 2025, 11:25 UTC
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.
osv:CVE-2025-21669
Kernel
Fixed versions: 5.10.234, 5.15.177, 6.1.127, 6.6.74, 6.12.11
Complete source record
{
"id": "34144d050923222ada3c6aa2c2a3f11409a1c879b395cd092b93262740164f89",
"url": "https://osv.dev/vulnerability/CVE-2025-21669",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "vsock/virtio: discard packets if the transport changes",
"summary": "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.",
"evidence": "osv:CVE-2025-21669",
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],
"modified": "2026-10-28T02:30:30.546667015Z",
"provider": "osv",
"references": [
"https://cert-portal.siemens.com/productcert/html/ssa-265688.html",
"https://git.kernel.org/stable/c/18a7fc371d1dbf8deff16c2dd9292bcc73f43040",
"https://git.kernel.org/stable/c/2cb7c756f605ec02ffe562fb26828e4bcc5fdfc1",
"https://git.kernel.org/stable/c/6486915fa661584d70e8e7e4068c6c075c67dd6d",
"https://git.kernel.org/stable/c/677579b641af109613564460a4e3bdcb16850b61",
"https://git.kernel.org/stable/c/88244163bc7e7b0ce9dd7bf4c8a563b41525c3ee",
"https://git.kernel.org/stable/c/d88b249e14bd0ee1e46bbe4f456e22e01b8c68de",
"https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21669.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-21669",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 497448,
"published_at": "2025-01-31T11:25:33.185+00:00"
}