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CVE-2026-53132 (GCVE-0-2026-53132)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-08-05 12:33
VLAI
Title
vsock/virtio: fix potential unbounded skb queue
Summary
In the Linux kernel, the following vulnerability has been resolved: vsock/virtio: fix potential unbounded skb queue virtio_transport_inc_rx_pkt() checks vvs->rx_bytes + len > vvs->buf_alloc. virtio_transport_recv_enqueue() skips coalescing for packets with VIRTIO_VSOCK_SEQ_EOM. If fed with packets with len == 0 and VIRTIO_VSOCK_SEQ_EOM, a very large number of packets can be queued because vvs->rx_bytes stays at 0. Fix this by estimating the skb metadata size: (Number of skbs in the queue) * SKB_TRUESIZE(0)
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 077706165717686a2a6a71405fef036cd5b37ae0 , < 1eca304f97a34ed5e921e1f0e06c8b241f25bf12 (git)
Affected: 077706165717686a2a6a71405fef036cd5b37ae0 , < 9bdc637fde66b63d6cad0caacd034888bb7bf5f5 (git)
Affected: 077706165717686a2a6a71405fef036cd5b37ae0 , < 100d5b2ffdc6468b9e48532641f29e83efdcb63c (git)
Affected: 077706165717686a2a6a71405fef036cd5b37ae0 , < 059b7dbd20a6f0c539a45ddff1573cb8946685b5 (git)
Affected: 5852a2b573f7a3a29df46296e56aa3491e589cdf (git)
Affected: 6.1.63 , < 6.2 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.3
Unaffected: 0 , < 6.3 (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:L - The vulnerable code is in virtio/vhost-vsock receive handling, reached through a local virtual socket channel rather than ordinary IP networking. The highest reasonable scenario is a malicious KVM guest or local vsock peer supplying crafted virtio-vsock packets to a host vsock endpoint.\nAC:L - Once the attacker can supply virtio-vsock headers, repeatedly sending len=0 OP_RW packets with VIRTIO_VSOCK_SEQ_EOM deterministically bypasses payload accounting. No race, timing window, or rare memory layout condition is required.\nPR:N - The vhost-vsock receive path performs address/type/state validation but no host credential, capability, or authentication check before enqueueing the packet. A malicious guest/peer needs no privileges on the vulnerable host kernel to deliver crafted virtio-vsock packets.\nUI:N - No victim user action is required after a reachable vsock endpoint exists. The attacker can flood the receive queue directly.\nS:C - In the vhost-vsock deployment, guest-controlled packets consume host kernel memory, crossing the guest/host security boundary. This is a KVM guest-to-host denial-of-service scenario.\nC:N - The bug is unbounded skb queue growth from missing metadata accounting, not an out-of-bounds read, UAF, or data disclosure path. I found no confidentiality primitive.\nI:N - The flaw queues attacker-supplied zero-length skb metadata but does not corrupt memory or provide an arbitrary write/control-flow primitive. I found no integrity impact beyond denial of service.\nA:H - The receive queue can grow without the intended buffer-accounting limit, causing unbounded host kernel memory consumption. A sustained flood can drive OOM or host-wide service loss."
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


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