GHSA-GVV5-3H67-3922
Vulnerability from github – Published: 2026-09-04 18:31 – Updated: 2026-09-04 18:31
VLAI
Details
In the Linux kernel, the following vulnerability has been resolved:
xfrm: espintcp: fix UAF during close
ZDI reported and analyzed a race condition during close for espintcp sockets:
espintcp_close() frees emsg->skb via kfree_skb() without holding
any socket lock. Concurrently, the xfrm_trans_reinject work queue
invokes esp_output_tcp_finish() -> espintcp_push_skb() ->
espintcp_push_msgs() -> skb_send_sock_locked(), which reads the
same skb as a data source.
Fix this by adding a synchronize_rcu() call after resetting sk_prot, since esp_output_tcp_finish() runs under RCU and won't use a socket with sk_prot == &tcp_prot. Simply taking the socket lock in espintcp_close() could lead to leaks, if esp_output_tcp_finish() re-adds an skb in the slot we just freed. After this, the existing barrier() is no longer needed.
{
"affected": [],
"aliases": [
"CVE-2026-80848"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-04T16:18:13Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: espintcp: fix UAF during close\n\nZDI reported and analyzed a race condition during close for espintcp\nsockets:\n\n espintcp_close() frees emsg-\u003eskb via kfree_skb() without holding\n any socket lock. Concurrently, the xfrm_trans_reinject work queue\n invokes esp_output_tcp_finish() -\u003e espintcp_push_skb() -\u003e\n espintcp_push_msgs() -\u003e skb_send_sock_locked(), which reads the\n same skb as a data source.\n\nFix this by adding a synchronize_rcu() call after resetting sk_prot,\nsince esp_output_tcp_finish() runs under RCU and won\u0027t use a socket\nwith sk_prot == \u0026tcp_prot. Simply taking the socket lock in\nespintcp_close() could lead to leaks, if esp_output_tcp_finish()\nre-adds an skb in the slot we just freed. After this, the existing\nbarrier() is no longer needed.",
"id": "GHSA-gvv5-3h67-3922",
"modified": "2026-09-04T18:31:28Z",
"published": "2026-09-04T18:31:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80848"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/24efebecf415ba264adba0f0491cec436463a14f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/29121c5e6591da527e8e36ddac7120dc527f574d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b31a875693c480c611519faca46216514e3e052"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4bc0dfa28dca6fc0084203732695968049c44072"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/54b41ad14da9a981131ab6e4d3f79321a503ea5d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/deb232e884877bf10b4ce2580909eedec986c284"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb3bbf29c723fe75c0eb92be14f0ec92971fe272"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ed5d9102190c45fc70121c036b0626b740040b75"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ff8dd7a932f34409a56e1b91a1219340f17457e9"
}
],
"schema_version": "1.4.0",
"severity": []
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…