CVE-2026-46158 (GCVE-0-2026-46158)
Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-09-14 11:58
VLAI
EPSS
VEX
Title
mptcp: pm: ADD_ADDR rtx: always decrease sk refcount
Summary
In the Linux kernel, the following vulnerability has been resolved:
mptcp: pm: ADD_ADDR rtx: always decrease sk refcount
When an ADD_ADDR is retransmitted, the sk is held in sk_reset_timer().
It should then be released in all cases at the end.
Some (unlikely) checks were returning directly instead of calling
sock_put() to decrease the refcount. Jump to a new 'exit' label to call
__sock_put() (which will become sock_put() in the next commit) to fix
this potential leak.
While at it, drop the '!msk' check which cannot happen because it is
never reset, and explicitly mark the remaining one as "unlikely".
Severity
5.5 (Medium)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < f5555a6d7c472849fdf2b426e3d0a85103118793
(git)
Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < e9ba34301d2e90f63f97c76ad9eb98e5250fe961 (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 81d8142148164176385c279c7c1e1d581867423d (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 9426265e157dd77ec237c795901ed4dea6d69b5c (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < b41dd76f3b9735096c21d3e799a2b9fe36498d57 (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < acd3d3562315c99f3c0db16f0fcc5f0306638982 (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 25e37407442b8766ec2cf52fb4e31b5c3d3aeeae (git) Affected: 00cfd77b9063dcdf3628a7087faba60de85a9cc8 , < 9634cb35af17019baec21ca648516ce376fa10e6 (git) |
guessed | |
| Linux | Linux |
Affected:
5.10
Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.218 , ≤ 5.15.* (semver) Unaffected: 6.1.185 , ≤ 6.1.* (semver) Unaffected: 6.6.142 , ≤ 6.6.* (semver) Unaffected: 6.12.92 , ≤ 6.12.* (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
guessed |
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}
],
"providerMetadata": {
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"datePublished": "2026-05-28T09:36:13.821Z",
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"title": "mptcp: pm: ADD_ADDR rtx: always decrease sk refcount",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-46158.json",
"version": "5"
},
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Jump to a new \u0027exit\u0027 label to call\\n__sock_put() (which will become sock_put() in the next commit) to fix\\nthis potential leak.\\n\\nWhile at it, drop the \u0027!msk\u0027 check which cannot happen because it is\\nnever reset, and explicitly mark the remaining one as 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T07:41:09+00:00",
"cve": "CVE-2026-46158",
"id": "CVE-2026-46158",
"initial_release_date": "2026-05-28T00:00:00+00:00",
"product_status:known_affected": "232",
"product_status:known_not_affected": "42",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: mptcp: pm: ADD_ADDR rtx: always decrease sk refcount",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46158.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:11:55Z",
"cve": "CVE-2026-46158",
"id": "CVE-2026-46158",
"initial_release_date": "2026-05-29T01:16:05Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "557",
"product_status:known_not_affected": "175",
"product_status:recommended": "254",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-46158",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-46158.json",
"version": "12"
}
}
}
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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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