CVE-2026-31700 (GCVE-0-2026-31700)
Vulnerability from cvelistv5 – Published: 2026-05-01 13:56 – Updated: 2026-09-08 08:48
VLAI
EPSS
VEX
Title
net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()
Summary
In the Linux kernel, the following vulnerability has been resolved:
net/packet: fix TOCTOU race on mmap'd vnet_hdr in tpacket_snd()
In tpacket_snd(), when PACKET_VNET_HDR is enabled, vnet_hdr points
directly into the mmap'd TX ring buffer shared with userspace. The
kernel validates the header via __packet_snd_vnet_parse() but then
re-reads all fields later in virtio_net_hdr_to_skb(). A concurrent
userspace thread can modify the vnet_hdr fields between validation
and use, bypassing all safety checks.
The non-TPACKET path (packet_snd()) already correctly copies vnet_hdr
to a stack-local variable. All other vnet_hdr consumers in the kernel
(tun.c, tap.c, virtio_net.c) also use stack copies. The TPACKET TX
path is the only caller of virtio_net_hdr_to_skb() that reads directly
from user-controlled shared memory.
Fix this by copying vnet_hdr from the mmap'd ring buffer to a
stack-local variable before validation and use, consistent with the
approach used in packet_snd() and all other callers.
Severity
7.8 (High)
Assigner
References
9 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1d036d25e5609ba73fee6a88db01c306b140d512 , < 0f4c9754956b86de158a4af5278c5cf5bda9439e
(git)
Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 714aa973da8163925eda7efd49361ccbee21ee46 (git) Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 1490f82353bdabc09265a74e645b07f05cf4188e (git) Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 74e2db36fe50e3ad9d5300d7fd0e6e2a15a6d121 (git) Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 3a1bf9116ea31470b89692585c3910dfe830dcdd (git) Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 28324a3b62d9ce7f9bdd65a8ce63f382041d1b27 (git) Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 48a6ef291a17639e1b6ae0fbe9c8b2bb87d7804b (git) Affected: 1d036d25e5609ba73fee6a88db01c306b140d512 , < 2c054e17d9d41f1020376806c7f750834ced4dc5 (git) |
guessed | |
| Linux | Linux |
Affected:
4.6
Unaffected: 0 , < 4.6 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.84 , ≤ 6.12.* (semver) Unaffected: 6.18.25 , ≤ 6.18.* (semver) Unaffected: 7.0.2 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-02T12:48:21+00:00",
"cve": "CVE-2026-31700",
"id": "CVE-2026-31700",
"initial_release_date": "2026-05-01T00:00:00+00:00",
"product_status:known_affected": "246",
"product_status:known_not_affected": "28",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net/packet: fix TOCTOU race on mmap\u0027d vnet_hdr in tpacket_snd()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31700.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-09T00:21:48Z",
"cve": "CVE-2026-31700",
"id": "CVE-2026-31700",
"initial_release_date": "2026-05-02T01:25:33Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "505",
"product_status:known_not_affected": "4",
"product_status:recommended": "499",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-31700",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31700.json",
"version": "22"
}
}
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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