CVE-2026-52974 (GCVE-0-2026-52974)
Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
VLAI
EPSS
VEX
Title
net: tls: fix strparser anchor skb leak on offload RX setup failure
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: tls: fix strparser anchor skb leak on offload RX setup failure
When tls_set_device_offload_rx() fails at tls_dev_add(), the error path
calls tls_sw_free_resources_rx() to clean up the SW context that was
initialized by tls_set_sw_offload(). This function calls
tls_sw_release_resources_rx() (which stops the strparser via
tls_strp_stop()) and tls_sw_free_ctx_rx() (which kfrees the context),
but never frees the anchor skb that was allocated by alloc_skb(0) in
tls_strp_init().
Note that tls_sw_free_resources_rx() is exclusively used for this
"failed to start offload" code path, there's no other caller.
The leak did not exist before commit 84c61fe1a75b ("tls: rx: do not use
the standard strparser"), because the standard strparser doesn't try
to pre-allocate an skb.
The normal close path in tls_sk_proto_close() handles cleanup by calling
tls_sw_strparser_done() (which calls tls_strp_done()) after dropping
the socket lock, because tls_strp_done() does cancel_work_sync() and
the strparser work handler takes the socket lock.
Severity
7.5 (High)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 0c9f399b37ce22a5ed94cc51f03ed07ac7f38e32
(git)
Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 688f12aa44511dd57e448eb670075c6302ad1dc1 (git) Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 3c405dfa9619e506e75b8e41f8b29a5b99731877 (git) Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 9c54e76f8d6eb11735918777ef0e0509e089557d (git) Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < bd07fe6c38b9e44ff3fc02692a53f095c5cc9afc (git) Affected: 84c61fe1a75b4255df1e1e7c054c9e6d048da417 , < 58689498ca3384851145a754dbb1d8ed1cf9fb54 (git) |
guessed | |
| Linux | Linux |
Affected:
6.0
Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (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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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tls: fix strparser anchor skb leak on offload RX setup failure\n\nWhen tls_set_device_offload_rx() fails at tls_dev_add(), the error path\ncalls tls_sw_free_resources_rx() to clean up the SW context that was\ninitialized by tls_set_sw_offload(). This function calls\ntls_sw_release_resources_rx() (which stops the strparser via\ntls_strp_stop()) and tls_sw_free_ctx_rx() (which kfrees the context),\nbut never frees the anchor skb that was allocated by alloc_skb(0) in\ntls_strp_init().\n\nNote that tls_sw_free_resources_rx() is exclusively used for this\n\"failed to start offload\" code path, there\u0027s no other caller.\n\nThe leak did not exist before commit 84c61fe1a75b (\"tls: rx: do not use\nthe standard strparser\"), because the standard strparser doesn\u0027t try\nto pre-allocate an skb.\n\nThe normal close path in tls_sk_proto_close() handles cleanup by calling\ntls_sw_strparser_done() (which calls tls_strp_done()) after dropping\nthe socket lock, because tls_strp_done() does cancel_work_sync() and\nthe strparser work handler takes the socket lock."
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"version": "3.1"
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{
"lang": "en",
"value": "AV:N - A remote TLS peer can plausibly trigger this through a network-facing kTLS-enabled service that installs TLS_RX state after handshake on a TLS RX offload-capable NIC. The direct kernel path is setsockopt-driven, but the vulnerable subsystem is kTLS receive/offload setup for network connections and can be reached per remote connection.\nAC:L - There is no race or fragile timing requirement; the attacker can repeatedly drive RX state setup and can plausibly force tls_dev_add() failure via unsupported TLS 1.2 RX offload parameters or exhausted offload resources. The required offload-capable deployment is a reasonable server scenario for this subsystem.\nPR:N - In the network-facing kTLS service scenario, the attacker needs no local account or prior authentication to initiate TLS connections that cause the service to install RX state. Any application-level authentication would occur after the connection setup path.\nUI:N - No victim user action is required beyond the target service automatically handling incoming TLS connections. The attacker can repeat the trigger by opening connections.\nS:U - The impact remains within the kernel and network stack security authority. There is no VM escape, IOMMU bypass, or cross-scope boundary crossing.\nC:N - The bug leaks an internal zero-length anchor skb object by losing its reference; it does not expose kernel memory contents to the attacker. No read primitive or information disclosure was identified.\nI:N - The issue is a missing cleanup in an error path and does not corrupt memory or modify attacker-chosen kernel data. No write primitive or control-flow impact was identified.\nA:H - The leaked skb is kernel memory and the failing offload setup path can be triggered repeatedly, allowing unbounded memory consumption. Related strparser skb leak precedent treats repeatable network-triggered memory exhaustion as high availability impact."
}
]
}
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"title": "net: tls: fix strparser anchor skb leak on offload RX setup failure",
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"date": "2026-09-16",
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"status": "final",
"title": "net: tls: fix strparser anchor skb leak on offload RX setup failure",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52974.json",
"version": "2"
},
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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2026-08-05T14:37:03+00:00",
"cve": "CVE-2026-52974",
"id": "CVE-2026-52974",
"initial_release_date": "2026-06-24T00:00:00+00:00",
"product_status:known_affected": "184",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: tls: fix strparser anchor skb leak on offload RX setup failure",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52974.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-10T17:00:08Z",
"cve": "CVE-2026-52974",
"id": "CVE-2026-52974",
"initial_release_date": "2026-06-27T01:55:12Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "453",
"product_status:known_not_affected": "279",
"product_status:recommended": "250",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-52974",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52974.json",
"version": "12"
}
}
}
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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
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- 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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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
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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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