Answer in brief
CVE-2026-90138 records a Unknown severity vulnerability in vsock: don't check the listener's sk_err in vsock_accept(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), 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.
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), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d021c344051af91f42c5ba9fdedc176740cbd238 <c5a75d37c21e558cc6fad1597e732ead30745eed || >=d021c344051af91f42c5ba9fdedc176740cbd238 <36e5fa009f98a4edbe1783ac11c0df672b224742 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <491b368a0c6e5f28b615a50b0d384f5c25fde2a7 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <b8c899cf5e7be29840a172c183dedd8d3e7a0287 | c5a75d37c21e558cc6fad1597e732ead30745eed, 36e5fa009f98a4edbe1783ac11c0df672b224742, 491b368a0c6e5f28b615a50b0d384f5c25fde2a7, b8c899cf5e7be29840a172c183dedd8d3e7a0287 |
| Linux/Linuxgeneric | 3.9 | Not reported |
| Linux/Linuxgeneric | >=d021c344051af91f42c5ba9fdedc176740cbd238 <64348c55dd7596ca2c033dcd102af44bdd7e8acd || >=d021c344051af91f42c5ba9fdedc176740cbd238 <c5a75d37c21e558cc6fad1597e732ead30745eed || >=d021c344051af91f42c5ba9fdedc176740cbd238 <36e5fa009f98a4edbe1783ac11c0df672b224742 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <491b368a0c6e5f28b615a50b0d384f5c25fde2a7 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <b8c899cf5e7be29840a172c183dedd8d3e7a0287 | 64348c55dd7596ca2c033dcd102af44bdd7e8acd, c5a75d37c21e558cc6fad1597e732ead30745eed, 36e5fa009f98a4edbe1783ac11c0df672b224742, 491b368a0c6e5f28b615a50b0d384f5c25fde2a7, b8c899cf5e7be29840a172c183dedd8d3e7a0287 |
| Linux/Linuxgeneric | >=d021c344051af91f42c5ba9fdedc176740cbd238 <c99d12052f663d9914bc944302fee5a1d50d8ca5 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <64348c55dd7596ca2c033dcd102af44bdd7e8acd || >=d021c344051af91f42c5ba9fdedc176740cbd238 <c5a75d37c21e558cc6fad1597e732ead30745eed || >=d021c344051af91f42c5ba9fdedc176740cbd238 <36e5fa009f98a4edbe1783ac11c0df672b224742 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <491b368a0c6e5f28b615a50b0d384f5c25fde2a7 || >=d021c344051af91f42c5ba9fdedc176740cbd238 <b8c899cf5e7be29840a172c183dedd8d3e7a0287 | c99d12052f663d9914bc944302fee5a1d50d8ca5, 64348c55dd7596ca2c033dcd102af44bdd7e8acd, c5a75d37c21e558cc6fad1597e732ead30745eed, 36e5fa009f98a4edbe1783ac11c0df672b224742, 491b368a0c6e5f28b615a50b0d384f5c25fde2a7, b8c899cf5e7be29840a172c183dedd8d3e7a0287 |
Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 30, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 17, 2026
In the Linux kernel, the following vulnerability has been resolved: vsock: don't check the listener's sk_err in vsock_accept() Syzbot reported an issue which can be reproduced with these steps: r0 = socket(AF_VSOCK, SOCK_STREAM, 0) bind(r0, {VMADDR_CID_ANY, PORT}) connect(r0, {VMADDR_CID_LOCAL, PORT}) -> -1, EPROTO (self-connect) listen(r0, backlog) -> 0 r1 = socket(AF_VSOCK, SOCK_STREAM, 0) connect(r1, {VMADDR_CID_LOCAL, PORT}) -> 0 accept(r0) -> -1, EPROTO (stale sk_err) Basically, it creates a socket (r0) and triggers a self-connect after binding it. This self-connect fails with EPROTO because it loops back to r0 while the socket is still in the TCP_SYN_SENT state, causing it to be incorrectly dispatched to the connecting-client path. The unexpected packet type encountered there sets sk_err to EPROTO. After that, it invokes a listen() call on the same socket. This listen() call succeeds because the kernel's listening path never inspects or clears sk_err. Then, a new socket (r1) is created as a normal client and connects to r0. However, vsock_accept() rejects this incoming connection because the listener's sk_err still holds the EPROTO error from the earlier failed self-connect. This rejection causes the child socket created for r1's connection to never be freed on virtio or hyperv transports; only the VMCI transport implements pending_work to revisit and clean up a rejected socket. For a non-blocking connect(), vsock_connect() may return -EINPROGRESS immediately, and vsock_connect_timeout() can later set sk->sk_err asynchronously. Since no vsock transport ever sets sk_err on a socket while it is in TCP_LISTEN state, checking it in vsock_accept() serves no purpose and only carries forward errors left behind by earlier, unrelated connection attempts on the same socket. Remove the checks so accept() no longer rejects valid incoming connections because of a stale error, which also avoids the resource leak described above.
Quoted source text, attributed separately from HOL analysis.