vsock/vmci: validate packet source for connected sockets
Summary
| CVE | CVE-2026-99122 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-28 11:17:31 UTC |
| Updated | 2026-11-10 19:22:30 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: validate packet source for connected sockets vmci_transport_recv_stream_cb() looks up sockets first by the full source and destination tuple, then by destination only in the bound table. The fallback can select a non-listening socket without checking whether the packet came from its stored peer. This was reproduced with two VMCI contexts. A RST from the context not stored in a TCP_SYN_SENT socket reset that socket after it was selected by the destination-only lookup. VMCI can process notification packets in bottom-half context when the socket is not owned by user context, or defer packets to a workqueue. Use vsock_check_source() after taking the socket lock in the bottom-half path, and recheck after lock_sock() in the workqueue path. Listening sockets continue to accept packets from any source. Reply with a RST addressed from the received packet before dropping a source that fails validation. This preserves the existing reset behavior for bound non-listening and concurrently closed sockets without directing the reset to a connected socket's stored peer. |
Risk And Classification
Primary CVSS: v3.1 7.3 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H
EPSS: 0.001200000 probability, percentile 0.018490000 (date 2026-11-10)
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.3 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.3 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
LowIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected d021c344051af91f42c5ba9fdedc176740cbd238 cdd1f99eaa4d4db82d506eb50e724460671c7cac git | Not specified |
| CNA | Linux | Linux | affected d021c344051af91f42c5ba9fdedc176740cbd238 c027f8b429dbb2157fc1b503df196e272d947c89 git | Not specified |
| CNA | Linux | Linux | affected d021c344051af91f42c5ba9fdedc176740cbd238 90c423b62ec9be08177f74b07a47937ca8d2035b git | Not specified |
| CNA | Linux | Linux | affected d021c344051af91f42c5ba9fdedc176740cbd238 ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7 git | Not specified |
| CNA | Linux | Linux | affected 3.9 | Not specified |
| CNA | Linux | Linux | unaffected 3.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.117 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.59 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.13 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/90c423b62ec9be08177f74b07a47937ca8d2035b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/cdd1f99eaa4d4db82d506eb50e724460671c7cac | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c027f8b429dbb2157fc1b503df196e272d947c89 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/ad9a7da3fa39c2d616ec0dd3cf6e30531d032fe7 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.