github - ghsa-p47r-wjhf-x2fg

GHSA-P47R-WJHF-X2FG

Vulnerability from github – Published: 2025-10-24 18:30 – Updated: 2025-10-24 18:30

Details

In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix request_sock leak in sk lookup helpers

A customer reported a request_socket leak in a Calico cloud environment. We found that a BPF program was doing a socket lookup with takes a refcnt on the socket and that it was finding the request_socket but returning the parent LISTEN socket via sk_to_full_sk() without decrementing the child request socket 1st, resulting in request_sock slab object leak. This patch retains the existing behaviour of returning full socks to the caller but it also decrements the child request_socket if one is present before doing so to prevent the leak.

Thanks to Curtis Taylor for all the help in diagnosing and testing this. And thanks to Antoine Tenart for the reproducer and patch input.

v2 of this patch contains, refactor as per Daniel Borkmann's suggestions to validate RCU flags on the listen socket so that it balances with bpf_sk_release() and update comments as per Martin KaFai Lau's suggestion. One small change to Daniels suggestion, put "sk = sk2" under "if (sk2 != sk)" to avoid an extra instruction.

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49697"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-401"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:44Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix request_sock leak in sk lookup helpers\n\nA customer reported a request_socket leak in a Calico cloud environment. We\nfound that a BPF program was doing a socket lookup with takes a refcnt on\nthe socket and that it was finding the request_socket but returning the parent\nLISTEN socket via sk_to_full_sk() without decrementing the child request socket\n1st, resulting in request_sock slab object leak. This patch retains the\nexisting behaviour of returning full socks to the caller but it also decrements\nthe child request_socket if one is present before doing so to prevent the leak.\n\nThanks to Curtis Taylor for all the help in diagnosing and testing this. And\nthanks to Antoine Tenart for the reproducer and patch input.\n\nv2 of this patch contains, refactor as per Daniel Borkmann\u0027s suggestions to\nvalidate RCU flags on the listen socket so that it balances with bpf_sk_release()\nand update comments as per Martin KaFai Lau\u0027s suggestion. One small change to\nDaniels suggestion, put \"sk = sk2\" under \"if (sk2 != sk)\" to avoid an extra\ninstruction.",
  "id": "GHSA-p47r-wjhf-x2fg",
  "modified": "2025-10-24T18:30:56Z",
  "published": "2025-10-24T18:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49697"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3046a827316c0e55fc563b4fb78c93b9ca5c7c37"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/516760f1d2979903eaad5b437256913c5cd98416"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a62b5ba4c0ce8315b6382cd4ace81b48cd121cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8ffe2e50e9678c8373027492035f094b130437f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b03607437ea81b850599f705096b05b85e7a4a71"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49697 (GCVE-0-2022-49697)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-05-04 08:43

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix request_sock leak in sk lookup helpers A customer reported a request_socket leak in a Calico cloud environment. We found that a BPF program was doing a socket lookup with takes a refcnt on the socket and that it was finding the request_socket but returning the parent LISTEN socket via sk_to_full_sk() without decrementing the child request socket 1st, resulting in request_sock slab object leak. This patch retains the existing behaviour of returning full socks to the caller but it also decrements the child request_socket if one is present before doing so to prevent the leak. Thanks to Curtis Taylor for all the help in diagnosing and testing this. And thanks to Antoine Tenart for the reproducer and patch input. v2 of this patch contains, refactor as per Daniel Borkmann's suggestions to validate RCU flags on the listen socket so that it balances with bpf_sk_release() and update comments as per Martin KaFai Lau's suggestion. One small change to Daniels suggestion, put "sk = sk2" under "if (sk2 != sk)" to avoid an extra instruction.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/8ffe2e50e9678c837…
	https://git.kernel.org/stable/c/516760f1d2979903e…
	https://git.kernel.org/stable/c/b03607437ea81b850…
	https://git.kernel.org/stable/c/5a62b5ba4c0ce8315…
	https://git.kernel.org/stable/c/3046a827316c0e55f…

Impacted products

Vendor

Product

Version

Linux

Affected: edbf8c01de5a104a71ed6df2bf6421ceb2836a8e , < 8ffe2e50e9678c8373027492035f094b130437f1 (git)
Affected: edbf8c01de5a104a71ed6df2bf6421ceb2836a8e , < 516760f1d2979903eaad5b437256913c5cd98416 (git)
Affected: edbf8c01de5a104a71ed6df2bf6421ceb2836a8e , < b03607437ea81b850599f705096b05b85e7a4a71 (git)
Affected: edbf8c01de5a104a71ed6df2bf6421ceb2836a8e , < 5a62b5ba4c0ce8315b6382cd4ace81b48cd121cd (git)
Affected: edbf8c01de5a104a71ed6df2bf6421ceb2836a8e , < 3046a827316c0e55fc563b4fb78c93b9ca5c7c37 (git)

Linux

Affected: 5.2
Unaffected: 0 , < 5.2 (semver)
Unaffected: 5.4.202 , ≤ 5.4.* (semver)
Unaffected: 5.10.127 , ≤ 5.10.* (semver)
Unaffected: 5.15.51 , ≤ 5.15.* (semver)
Unaffected: 5.18.8 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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        {
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          "programFiles": [
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              "lessThanOrEqual": "*",
              "status": "unaffected",
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        }
      ],
      "cpeApplicability": [
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              "cpeMatch": [
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          "url": "https://git.kernel.org/stable/c/3046a827316c0e55fc563b4fb78c93b9ca5c7c37"
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Sightings

Author	Source	Type	Date

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.

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GHSA-P47R-WJHF-X2FG

CVE-2022-49697 (GCVE-0-2022-49697)

Tags

Sightings

Nomenclature