CVE-2026-46086 (GCVE-0-2026-46086)
Vulnerability from cvelistv5 – Published: 2026-05-27 12:58 – Updated: 2026-09-08 08:49
VLAI
EPSS
VEX
Title
net: bridge: use a stable FDB dst snapshot in RCU readers
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: use a stable FDB dst snapshot in RCU readers
Local FDB entries can be rewritten in place by `fdb_delete_local()`, which
updates `f->dst` to another port or to `NULL` while keeping the entry
alive. Several bridge RCU readers inspect `f->dst`, including
`br_fdb_fillbuf()` through the `brforward_read()` sysfs path.
These readers currently load `f->dst` multiple times and can therefore
observe inconsistent values across the check and later dereference.
In `br_fdb_fillbuf()`, this means a concurrent local-FDB update can change
`f->dst` after the NULL check and before the `port_no` dereference,
leading to a NULL-ptr-deref.
Fix this by taking a single `READ_ONCE()` snapshot of `f->dst` in each
affected RCU reader and using that snapshot for the rest of the access
sequence. Also publish the in-place `f->dst` updates in `fdb_delete_local()`
with `WRITE_ONCE()` so the readers and writer use matching access patterns.
Severity
5.5 (Medium)
Assigner
References
9 references
Impacted products
5 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
960b589f86c74ce582922fcb996103271081f4de , < c502fa9f094cb03d1d1685c71e2105ab359bc2b8
(git)
Affected: 960b589f86c74ce582922fcb996103271081f4de , < a6ae4511c07b91f597e461406c6330f0d4ff810e (git) Affected: 960b589f86c74ce582922fcb996103271081f4de , < 1406c4e0ed1eaf8a29801ab1163d00fb7ee4359a (git) Affected: 960b589f86c74ce582922fcb996103271081f4de , < 0b9e4bbfb7c949151e3acd44ed4aa33614d2e110 (git) Affected: 960b589f86c74ce582922fcb996103271081f4de , < 81af4137a30c4c2dc694dea8cacb180bd66000ef (git) Affected: 960b589f86c74ce582922fcb996103271081f4de , < 5424e678f9b304e148cf5dcc047cffc7a56a3bb5 (git) Affected: 960b589f86c74ce582922fcb996103271081f4de , < 9a2d9d4e657b23dc21f24cf139e3aeff0b61341f (git) Affected: 960b589f86c74ce582922fcb996103271081f4de , < df4601653201de21b487c3e7fffd464790cab808 (git) |
guessed | |
| Linux | Linux |
Affected:
3.14
Unaffected: 0 , < 3.14 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.86 , ≤ 6.12.* (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 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": "2026-07-28T07:42:38+00:00",
"cve": "CVE-2026-46086",
"id": "CVE-2026-46086",
"initial_release_date": "2026-05-27T00:00:00+00:00",
"product_status:fixed": "762",
"product_status:known_affected": "64",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: bridge: use a stable FDB dst snapshot in RCU readers",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46086.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:12:37Z",
"cve": "CVE-2026-46086",
"id": "CVE-2026-46086",
"initial_release_date": "2026-05-28T03:52:55Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "578",
"product_status:known_not_affected": "71",
"product_status:recommended": "380",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46086",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46086.json",
"version": "17"
}
}
}
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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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