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CVE-2026-52974 (GCVE-0-2026-52974)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-08-05 12:32
VLAI
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)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted 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 Create a notification for this product.
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 Create a notification for this product.
Show details on NVD website
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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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            }
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    "dateReserved": "2026-06-09T07:44:35.375Z",
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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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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.


Detection rules are retrieved from Rulezet.


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.