CVE-2026-52994 (GCVE-0-2026-52994)
Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
EPSS
VEX
Title
vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting
Summary
In the Linux kernel, the following vulnerability has been resolved:
vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting
virtio_transport_init_zcopy_skb() uses iter->count as the size argument
for msg_zerocopy_realloc(), which in turn passes it to
mm_account_pinned_pages() for RLIMIT_MEMLOCK accounting. However, this
function is called after virtio_transport_fill_skb() has already consumed
the iterator via __zerocopy_sg_from_iter(), so on the last skb, iter->count
will be 0, skipping the RLIMIT_MEMLOCK enforcement.
Pass pkt_len (the total bytes being sent) as an explicit parameter to
virtio_transport_init_zcopy_skb() instead of reading the already-consumed
iter->count.
This matches TCP and UDP, which both call msg_zerocopy_realloc() with
the original message size.
Severity
5.5 (Medium)
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
581512a6dc939ef122e49336626ae159f3b8a345 , < 6af1736b5810bc8a4a43a8518530113f5a757dc1
(git)
Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < d0117950075f0a9d5944980784c719d8ebcd4bff (git) Affected: 581512a6dc939ef122e49336626ae159f3b8a345 , < 1cb36e252211506f51095fe7ced8286cc77b4c80 (git) |
guessed | |
| Linux | Linux |
Affected:
6.7
Unaffected: 0 , < 6.7 (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
{
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"programFiles": [
"net/vmw_vsock/virtio_transport_common.c"
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}
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"url": "https://git.kernel.org/stable/c/1cb36e252211506f51095fe7ced8286cc77b4c80"
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"title": "vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting",
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"dateReserved": "2026-06-09T07:44:35.377Z",
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-15T13:17:29+00:00",
"cve": "CVE-2026-52994",
"id": "CVE-2026-52994",
"initial_release_date": "2026-06-24T00:00:00+00:00",
"product_status:known_affected": "184",
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"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: vsock/virtio: fix MSG_ZEROCOPY pinned-pages accounting",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52994.json",
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"cve": "CVE-2026-52994",
"id": "CVE-2026-52994",
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"title": "SUSE CVE CVE-2026-52994",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52994.json",
"version": "7"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Sightings
| Author | Source | Type | Date | Other |
|---|
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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